1086 lines
31 KiB
Python
Executable file
1086 lines
31 KiB
Python
Executable file
#!/usr/bin/env python
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# SPDX-License-Identifier: ISC
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#
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# test_isis_tilfa_topo1.py
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# Part of NetDEF Topology Tests
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#
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# Copyright (c) 2020 by
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# Network Device Education Foundation, Inc. ("NetDEF")
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#
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"""
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test_isis_lfa_topo1.py:
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+---------+
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+--------------------------------+ RT1 +-------------------------------+
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| +-------------+ +-------------+ |
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| | | | | |
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| | +----+----+ | |
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| | | |20 |
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+----+----+ +----+----+ +----+----+ +----+----+ +----+----+
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| | | | | | | | | |
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| RT2 | 5 | RT3 | | RT4 | | RT5 | | RT6 |
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| +--------+ | | | | | | |
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| | | | | | | | | |
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+----+----+ +----+----+ +----+----+ +----+----+ +----+----+
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| | | | |
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| | |15 | |
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|5 | | | |
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| | +----+----+ | |
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| | | | | |
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| +-------------+ RT7 +-------------+ |
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+--------------------------------+ +-------------------------------+
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+---------+
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"""
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import os
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import sys
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import pytest
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import json
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import time
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import tempfile
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from functools import partial
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# Save the Current Working Directory to find configuration files.
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CWD = os.path.dirname(os.path.realpath(__file__))
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sys.path.append(os.path.join(CWD, "../"))
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# pylint: disable=C0413
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# Import topogen and topotest helpers
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from lib import topotest
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from lib.topogen import Topogen, TopoRouter, get_topogen
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from lib.topolog import logger
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# Required to instantiate the topology builder class.
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pytestmark = [pytest.mark.isisd]
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# Global multi-dimensional dictionary containing all expected outputs
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outputs = {}
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def build_topo(tgen):
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"Build function"
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#
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# Define FRR Routers
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#
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for router in ["rt1", "rt2", "rt3", "rt4", "rt5", "rt6", "rt7"]:
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tgen.add_router(router)
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#
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# Define connections
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#
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switch = tgen.add_switch("s1")
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switch.add_link(tgen.gears["rt1"], nodeif="eth-rt2")
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switch.add_link(tgen.gears["rt2"], nodeif="eth-rt1")
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switch = tgen.add_switch("s2")
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switch.add_link(tgen.gears["rt2"], nodeif="eth-rt3")
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switch.add_link(tgen.gears["rt3"], nodeif="eth-rt2")
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switch = tgen.add_switch("s3")
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switch.add_link(tgen.gears["rt1"], nodeif="eth-rt3")
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switch.add_link(tgen.gears["rt3"], nodeif="eth-rt1")
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switch = tgen.add_switch("s4")
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switch.add_link(tgen.gears["rt1"], nodeif="eth-rt4")
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switch.add_link(tgen.gears["rt4"], nodeif="eth-rt1")
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switch = tgen.add_switch("s5")
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switch.add_link(tgen.gears["rt1"], nodeif="eth-rt5")
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switch.add_link(tgen.gears["rt5"], nodeif="eth-rt1")
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switch = tgen.add_switch("s6")
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switch.add_link(tgen.gears["rt1"], nodeif="eth-rt6")
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switch.add_link(tgen.gears["rt6"], nodeif="eth-rt1")
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switch = tgen.add_switch("s7")
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switch.add_link(tgen.gears["rt2"], nodeif="eth-rt7")
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switch.add_link(tgen.gears["rt7"], nodeif="eth-rt2")
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switch = tgen.add_switch("s8")
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switch.add_link(tgen.gears["rt3"], nodeif="eth-rt7")
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switch.add_link(tgen.gears["rt7"], nodeif="eth-rt3")
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switch = tgen.add_switch("s9")
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switch.add_link(tgen.gears["rt4"], nodeif="eth-rt7")
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switch.add_link(tgen.gears["rt7"], nodeif="eth-rt4")
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switch = tgen.add_switch("s10")
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switch.add_link(tgen.gears["rt5"], nodeif="eth-rt7")
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switch.add_link(tgen.gears["rt7"], nodeif="eth-rt5")
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switch = tgen.add_switch("s11")
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switch.add_link(tgen.gears["rt6"], nodeif="eth-rt7")
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switch.add_link(tgen.gears["rt7"], nodeif="eth-rt6")
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#
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# Populate multi-dimensional dictionary containing all expected outputs
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#
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files = ["show_ipv6_route.ref", "show_yang_interface_isis_adjacencies.ref"]
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for rname in ["rt1", "rt2", "rt3", "rt4", "rt5", "rt6", "rt7"]:
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outputs[rname] = {}
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for step in range(1, 16 + 1):
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outputs[rname][step] = {}
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for file in files:
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if step == 1:
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# Get snapshots relative to the expected initial network convergence
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filename = "{}/{}/step{}/{}".format(CWD, rname, step, file)
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outputs[rname][step][file] = open(filename).read()
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else:
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if rname != "rt1":
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continue
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if file == "show_yang_interface_isis_adjacencies.ref":
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continue
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# Get diff relative to the previous step
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filename = "{}/{}/step{}/{}.diff".format(CWD, rname, step, file)
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# Create temporary files in order to apply the diff
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f_in = tempfile.NamedTemporaryFile(mode="w")
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f_in.write(outputs[rname][step - 1][file])
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f_in.flush()
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f_out = tempfile.NamedTemporaryFile(mode="r")
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os.system(
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"patch -s -o %s %s %s" % (f_out.name, f_in.name, filename)
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)
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# Store the updated snapshot and remove the temporary files
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outputs[rname][step][file] = open(f_out.name).read()
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f_in.close()
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f_out.close()
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def setup_module(mod):
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"Sets up the pytest environment"
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tgen = Topogen(build_topo, mod.__name__)
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tgen.start_topology()
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router_list = tgen.routers()
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# For all registered routers, load the zebra configuration file
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for rname, router in router_list.items():
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router.load_config(
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TopoRouter.RD_ZEBRA, os.path.join(CWD, "{}/zebra.conf".format(rname))
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)
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router.load_config(
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TopoRouter.RD_ISIS, os.path.join(CWD, "{}/isisd.conf".format(rname))
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)
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router.load_config(
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TopoRouter.RD_BFD, os.path.join(CWD, "/dev/null".format(rname))
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)
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tgen.start_router()
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def teardown_module(mod):
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"Teardown the pytest environment"
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tgen = get_topogen()
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# This function tears down the whole topology.
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tgen.stop_topology()
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def router_compare_json_output(rname, command, reference, wait=0.5, count=120):
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"Compare router JSON output"
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logger.info('Comparing router "%s" "%s" output', rname, command)
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tgen = get_topogen()
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expected = json.loads(reference)
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# Run test function until we get an result. Wait at most 60 seconds.
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test_func = partial(topotest.router_json_cmp, tgen.gears[rname], command, expected)
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_, diff = topotest.run_and_expect(test_func, None, count=count, wait=wait)
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assertmsg = '"{}" JSON output mismatches the expected result'.format(rname)
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assert diff is None, assertmsg
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#
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# Step 1
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#
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# Test initial network convergence
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#
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def test_isis_adjacencies_step1():
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logger.info("Test (step 1): check IS-IS adjacencies")
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tgen = get_topogen()
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# Skip if previous fatal error condition is raised
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if tgen.routers_have_failure():
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pytest.skip(tgen.errors)
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for rname in ["rt1", "rt2", "rt3", "rt4", "rt5", "rt6", "rt7"]:
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router_compare_json_output(
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rname,
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"show yang operational-data /frr-interface:lib isisd",
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outputs[rname][1]["show_yang_interface_isis_adjacencies.ref"],
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)
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def test_rib_ipv6_step1():
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logger.info("Test (step 1): verify IPv6 RIB")
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tgen = get_topogen()
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# Skip if previous fatal error condition is raised
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if tgen.routers_have_failure():
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pytest.skip(tgen.errors)
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for rname in ["rt1", "rt2", "rt3", "rt4", "rt5", "rt6", "rt7"]:
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router_compare_json_output(
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rname, "show ipv6 route isis json", outputs[rname][1]["show_ipv6_route.ref"]
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)
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#
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# Step 2
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#
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# Action(s):
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# -Disable LFA protection on all interfaces
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#
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# Expected changes:
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# -rt1 should uninstall all backup nexthops from all routes
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#
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def test_rib_ipv6_step2():
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logger.info("Test (step 2): verify IPv6 RIB")
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tgen = get_topogen()
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# Skip if previous fatal error condition is raised
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if tgen.routers_have_failure():
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pytest.skip(tgen.errors)
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logger.info("Disabling LFA protection on all rt1 interfaces")
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "interface eth-rt2" -c "no isis fast-reroute lfa"'
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)
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "interface eth-rt3" -c "no isis fast-reroute lfa"'
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)
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "interface eth-rt4" -c "no isis fast-reroute lfa"'
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)
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "interface eth-rt5" -c "no isis fast-reroute lfa"'
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)
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "interface eth-rt6" -c "no isis fast-reroute lfa"'
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)
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for rname in ["rt1"]:
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router_compare_json_output(
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rname, "show ipv6 route isis json", outputs[rname][2]["show_ipv6_route.ref"]
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)
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#
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# Step 3
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#
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# Action(s):
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# -Re-enable LFA protection on all interfaces
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#
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# Expected changes:
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# -Revert changes from the previous step
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#
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def test_rib_ipv6_step3():
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logger.info("Test (step 3): verify IPv6 RIB")
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tgen = get_topogen()
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# Skip if previous fatal error condition is raised
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if tgen.routers_have_failure():
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pytest.skip(tgen.errors)
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logger.info("Re-enabling LFA protection on all rt1 interfaces")
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "interface eth-rt2" -c "isis fast-reroute lfa"'
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)
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "interface eth-rt3" -c "isis fast-reroute lfa"'
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)
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "interface eth-rt4" -c "isis fast-reroute lfa"'
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)
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "interface eth-rt5" -c "isis fast-reroute lfa"'
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)
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "interface eth-rt6" -c "isis fast-reroute lfa"'
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)
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for rname in ["rt1"]:
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router_compare_json_output(
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rname, "show ipv6 route isis json", outputs[rname][3]["show_ipv6_route.ref"]
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)
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#
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# Step 4
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#
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# Action(s):
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# -Disable LFA load-sharing
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#
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# Expected changes:
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# -rt1 should use at most one backup nexthop for each route
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#
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def test_rib_ipv6_step4():
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logger.info("Test (step 4): verify IPv6 RIB")
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tgen = get_topogen()
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# Skip if previous fatal error condition is raised
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if tgen.routers_have_failure():
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pytest.skip(tgen.errors)
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logger.info("Disabling LFA load-sharing on rt1")
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "router isis 1" -c "fast-reroute load-sharing disable"'
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)
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for rname in ["rt1"]:
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router_compare_json_output(
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rname, "show ipv6 route isis json", outputs[rname][4]["show_ipv6_route.ref"]
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)
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#
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# Step 5
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#
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# Action(s):
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# -Re-enable LFA load-sharing
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#
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# Expected changes:
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# -Revert changes from the previous step
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#
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def test_rib_ipv6_step5():
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logger.info("Test (step 5): verify IPv6 RIB")
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tgen = get_topogen()
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# Skip if previous fatal error condition is raised
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if tgen.routers_have_failure():
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pytest.skip(tgen.errors)
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logger.info("Re-enabling LFA load-sharing on rt1")
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "router isis 1" -c "no fast-reroute load-sharing disable"'
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)
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for rname in ["rt1"]:
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router_compare_json_output(
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rname, "show ipv6 route isis json", outputs[rname][5]["show_ipv6_route.ref"]
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)
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#
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# Step 6
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#
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# Action(s):
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# -Limit backup computation to critical priority prefixes only
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#
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# Expected changes:
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# -rt1 should uninstall all backup nexthops from all routes
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#
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def test_rib_ipv6_step6():
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logger.info("Test (step 6): verify IPv6 RIB")
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tgen = get_topogen()
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# Skip if previous fatal error condition is raised
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if tgen.routers_have_failure():
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pytest.skip(tgen.errors)
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logger.info("Limiting backup computation to critical priority prefixes only")
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "router isis 1" -c "fast-reroute priority-limit critical"'
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)
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for rname in ["rt1"]:
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router_compare_json_output(
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rname, "show ipv6 route isis json", outputs[rname][6]["show_ipv6_route.ref"]
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)
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#
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# Step 7
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#
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# Action(s):
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# -Configure a prefix priority list to classify rt7's loopback as a
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# critical-priority prefix
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#
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# Expected changes:
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# -rt1 should install backup nexthops for rt7's loopback route.
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#
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def test_rib_ipv6_step7():
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logger.info("Test (step 7): verify IPv6 RIB")
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tgen = get_topogen()
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# Skip if previous fatal error condition is raised
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if tgen.routers_have_failure():
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pytest.skip(tgen.errors)
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logger.info("Configuring a prefix priority list")
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "router isis 1" -c "spf prefix-priority critical CRITICAL_DESTINATIONS"'
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)
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "ipv6 access-list CRITICAL_DESTINATIONS seq 5 permit 2001:db8:1000::7/128"'
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)
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for rname in ["rt1"]:
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router_compare_json_output(
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rname, "show ipv6 route isis json", outputs[rname][7]["show_ipv6_route.ref"]
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)
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#
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# Step 8
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#
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# Action(s):
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# -Revert previous changes related to prefix priorities
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#
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# Expected changes:
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# -Revert changes from the previous two steps
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#
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def test_rib_ipv6_step8():
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logger.info("Test (step 8): verify IPv6 RIB")
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tgen = get_topogen()
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# Skip if previous fatal error condition is raised
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if tgen.routers_have_failure():
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pytest.skip(tgen.errors)
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logger.info("Reverting previous changes related to prefix priorities")
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "no ipv6 access-list CRITICAL_DESTINATIONS seq 5 permit 2001:db8:1000::7/128"'
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)
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "router isis 1" -c "no fast-reroute priority-limit critical"'
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)
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "router isis 1" -c "no spf prefix-priority critical CRITICAL_DESTINATIONS"'
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)
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for rname in ["rt1"]:
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router_compare_json_output(
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rname, "show ipv6 route isis json", outputs[rname][8]["show_ipv6_route.ref"]
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)
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|
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#
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# Step 9
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#
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# Action(s):
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# -Exclude eth-rt6 from LFA computation for eth-rt2's failure
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#
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# Expected changes:
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# -Uninstall the eth-rt2 protecting backup nexthops that go through eth-rt6
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#
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def test_rib_ipv6_step9():
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logger.info("Test (step 9): verify IPv6 RIB")
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tgen = get_topogen()
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# Skip if previous fatal error condition is raised
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if tgen.routers_have_failure():
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pytest.skip(tgen.errors)
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logger.info("Excluding eth-rt6 from LFA computation for eth-rt2's failure")
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tgen.net["rt1"].cmd(
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'vtysh -c "conf t" -c "interface eth-rt2" -c "isis fast-reroute lfa exclude interface eth-rt6"'
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)
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for rname in ["rt1"]:
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router_compare_json_output(
|
|
rname, "show ipv6 route isis json", outputs[rname][9]["show_ipv6_route.ref"]
|
|
)
|
|
|
|
|
|
#
|
|
# Step 10
|
|
#
|
|
# Action(s):
|
|
# -Remove exclusion of eth-rt6 from LFA computation for eth-rt2's failure
|
|
#
|
|
# Expected changes:
|
|
# -Revert changes from the previous step
|
|
#
|
|
def test_rib_ipv6_step10():
|
|
logger.info("Test (step 10): verify IPv6 RIB")
|
|
tgen = get_topogen()
|
|
|
|
# Skip if previous fatal error condition is raised
|
|
if tgen.routers_have_failure():
|
|
pytest.skip(tgen.errors)
|
|
|
|
logger.info(
|
|
"Removing exclusion of eth-rt6 from LFA computation for eth-rt2's failure"
|
|
)
|
|
tgen.net["rt1"].cmd(
|
|
'vtysh -c "conf t" -c "interface eth-rt2" -c "no isis fast-reroute lfa exclude interface eth-rt6"'
|
|
)
|
|
|
|
for rname in ["rt1"]:
|
|
router_compare_json_output(
|
|
rname,
|
|
"show ipv6 route isis json",
|
|
outputs[rname][10]["show_ipv6_route.ref"],
|
|
)
|
|
|
|
|
|
#
|
|
# Step 11
|
|
#
|
|
# Action(s):
|
|
# -Add LFA tiebreaker: prefer node protecting backup path
|
|
#
|
|
# Expected changes:
|
|
# -rt1 should prefer backup nexthops that provide node protection
|
|
#
|
|
def test_rib_ipv6_step11():
|
|
logger.info("Test (step 11): verify IPv6 RIB")
|
|
tgen = get_topogen()
|
|
|
|
# Skip if previous fatal error condition is raised
|
|
if tgen.routers_have_failure():
|
|
pytest.skip(tgen.errors)
|
|
|
|
logger.info("Adding LFA tiebreaker: prefer node protecting backup path")
|
|
tgen.net["rt1"].cmd(
|
|
'vtysh -c "conf t" -c "router isis 1" -c "fast-reroute lfa tiebreaker node-protecting index 10"'
|
|
)
|
|
|
|
for rname in ["rt1"]:
|
|
router_compare_json_output(
|
|
rname,
|
|
"show ipv6 route isis json",
|
|
outputs[rname][11]["show_ipv6_route.ref"],
|
|
)
|
|
|
|
|
|
#
|
|
# Step 12
|
|
#
|
|
# Action(s):
|
|
# -Add LFA tiebreaker: prefer backup path via downstream node
|
|
#
|
|
# Expected changes:
|
|
# -rt1 should prefer backup nexthops that satisfy the downstream condition
|
|
#
|
|
def test_rib_ipv6_step12():
|
|
logger.info("Test (step 12): verify IPv6 RIB")
|
|
tgen = get_topogen()
|
|
|
|
# Skip if previous fatal error condition is raised
|
|
if tgen.routers_have_failure():
|
|
pytest.skip(tgen.errors)
|
|
|
|
logger.info("Adding LFA tiebreaker: prefer backup path via downstream node")
|
|
tgen.net["rt1"].cmd(
|
|
'vtysh -c "conf t" -c "router isis 1" -c "fast-reroute lfa tiebreaker downstream index 20"'
|
|
)
|
|
|
|
for rname in ["rt1"]:
|
|
router_compare_json_output(
|
|
rname,
|
|
"show ipv6 route isis json",
|
|
outputs[rname][12]["show_ipv6_route.ref"],
|
|
)
|
|
|
|
|
|
#
|
|
# Step 13
|
|
#
|
|
# Action(s):
|
|
# -Add LFA tiebreaker: prefer backup path with lowest total metric
|
|
#
|
|
# Expected changes:
|
|
# -rt1 should prefer backup nexthops that have the best metric
|
|
#
|
|
def test_rib_ipv6_step13():
|
|
logger.info("Test (step 13): verify IPv6 RIB")
|
|
tgen = get_topogen()
|
|
|
|
# Skip if previous fatal error condition is raised
|
|
if tgen.routers_have_failure():
|
|
pytest.skip(tgen.errors)
|
|
|
|
logger.info("Adding LFA tiebreaker: prefer backup path with lowest total metric")
|
|
tgen.net["rt1"].cmd(
|
|
'vtysh -c "conf t" -c "router isis 1" -c "fast-reroute lfa tiebreaker lowest-backup-metric index 30"'
|
|
)
|
|
|
|
for rname in ["rt1"]:
|
|
router_compare_json_output(
|
|
rname,
|
|
"show ipv6 route isis json",
|
|
outputs[rname][13]["show_ipv6_route.ref"],
|
|
)
|
|
|
|
|
|
#
|
|
# Step 14
|
|
#
|
|
# Action(s):
|
|
# - Setting spf-delay-ietf init-delay of 15s
|
|
#
|
|
# Expected changes:
|
|
# - No routing table change
|
|
# - At the end of test, SPF reacts to a failure in 15s
|
|
#
|
|
def test_rib_ipv6_step14():
|
|
logger.info("Test (step 14): verify IPv6 RIB")
|
|
tgen = get_topogen()
|
|
|
|
# Skip if previous fatal error condition is raised
|
|
if tgen.routers_have_failure():
|
|
pytest.skip(tgen.errors)
|
|
|
|
logger.info("Setting spf-delay-ietf init-delay of 15s")
|
|
tgen.net["rt1"].cmd(
|
|
'vtysh -c "conf t" -c "router isis 1" -c "spf-delay-ietf init-delay 15000 short-delay 0 long-delay 0 holddown 0 time-to-learn 0"'
|
|
)
|
|
|
|
for rname in ["rt1"]:
|
|
router_compare_json_output(
|
|
rname,
|
|
"show ipv6 route isis json",
|
|
outputs[rname][14]["show_ipv6_route.ref"],
|
|
)
|
|
|
|
|
|
#
|
|
# Step 15
|
|
#
|
|
# Action(s):
|
|
# - shut the eth-rt2 interface on rt1
|
|
#
|
|
# Expected changes:
|
|
# - Route switchover of routes via eth-rt2
|
|
#
|
|
def test_rib_ipv6_step15():
|
|
logger.info("Test (step 15): verify IPv6 RIB")
|
|
tgen = get_topogen()
|
|
|
|
# Skip if previous fatal error condition is raised
|
|
if tgen.routers_have_failure():
|
|
pytest.skip(tgen.errors)
|
|
|
|
logger.info("Shut the interface to rt2 from the switch side and check fast-reroute")
|
|
tgen.net.cmd_raises("ip link set %s down" % tgen.net["s1"].intfs[0])
|
|
|
|
for rname in ["rt1"]:
|
|
router_compare_json_output(
|
|
rname,
|
|
"show ipv6 route isis json",
|
|
outputs[rname][15]["show_ipv6_route.ref"],
|
|
count=10,
|
|
wait=0.5,
|
|
)
|
|
|
|
|
|
#
|
|
# Step 16
|
|
#
|
|
# Action(s): wait for the convergence and SPF computation on rt1
|
|
#
|
|
# Expected changes:
|
|
# - convergence of IPv6 RIB
|
|
#
|
|
def test_rib_ipv6_step16():
|
|
logger.info("Test (step 16): verify IPv6 RIB")
|
|
tgen = get_topogen()
|
|
|
|
# Skip if previous fatal error condition is raised
|
|
if tgen.routers_have_failure():
|
|
pytest.skip(tgen.errors)
|
|
|
|
logger.info("Check SPF convergence")
|
|
|
|
for rname in ["rt1"]:
|
|
router_compare_json_output(
|
|
rname,
|
|
"show ipv6 route isis json",
|
|
outputs[rname][16]["show_ipv6_route.ref"],
|
|
)
|
|
|
|
|
|
#
|
|
# Step 17
|
|
#
|
|
# Action(s):
|
|
# - Unshut the interface to rt2 from the switch sid
|
|
#
|
|
# Expected changes:
|
|
# - The routing table converges
|
|
#
|
|
def test_rib_ipv6_step17():
|
|
logger.info("Test (step 17): verify IPv6 RIB")
|
|
tgen = get_topogen()
|
|
|
|
# Skip if previous fatal error condition is raised
|
|
if tgen.routers_have_failure():
|
|
pytest.skip(tgen.errors)
|
|
|
|
rname = "rt1"
|
|
|
|
logger.info("Unsetting spf-delay-ietf init-delay of 15s")
|
|
tgen.net[rname].cmd('vtysh -c "conf t" -c "router isis 1" -c "no spf-delay-ietf"')
|
|
|
|
logger.info(
|
|
"Unshut the interface to rt2 from the switch side and check fast-reroute"
|
|
)
|
|
tgen.net.cmd_raises("ip link set %s up" % tgen.net["s1"].intfs[0])
|
|
|
|
logger.info("Setting spf-delay-ietf init-delay of 15s")
|
|
tgen.net[rname].cmd(
|
|
'vtysh -c "conf t" -c "router isis 1" -c "spf-delay-ietf init-delay 15000 short-delay 0 long-delay 0 holddown 0 time-to-learn 0"'
|
|
)
|
|
|
|
router_compare_json_output(
|
|
rname,
|
|
"show ipv6 route isis json",
|
|
outputs[rname][14]["show_ipv6_route.ref"],
|
|
)
|
|
|
|
|
|
#
|
|
# Step 18
|
|
#
|
|
# Action(s):
|
|
# - drop traffic between rt1 and rt2 by shutting down the bridge between
|
|
# the routers. Interfaces on rt1 and rt2 stay up.
|
|
#
|
|
#
|
|
# Expected changes:
|
|
# - Route switchover of routes via eth-rt2
|
|
#
|
|
def test_rib_ipv6_step18():
|
|
def _rt2_neigh_down(router):
|
|
output = json.loads(router.vtysh_cmd("show isis neighbor rt2 json"))
|
|
|
|
"""
|
|
Previous output was:
|
|
{
|
|
"areas":[
|
|
{
|
|
"area":"1",
|
|
"circuits":[
|
|
{
|
|
"circuit":0,
|
|
"adj":"rt2",
|
|
"interface":{
|
|
"name":"eth-rt2",
|
|
"state":"Up",
|
|
"adj-flaps":1,
|
|
"last-ago":"21s",
|
|
"circuit-type":"L1",
|
|
"speaks":"IPv6",
|
|
"topologies":{
|
|
"topo-0":"ipv6-unicast"
|
|
},
|
|
"snpa":"2020.2020.2020",
|
|
"area-address":{
|
|
"isonet":"49.0000"
|
|
},
|
|
"ipv6-link-local":{
|
|
"ipv6":"fe80::ac19:a8ff:fee5:f48f"
|
|
},
|
|
"adj-sid":{
|
|
}
|
|
},
|
|
"level":1,
|
|
"expires-in":"2s"
|
|
},
|
|
{
|
|
"circuit":0
|
|
},
|
|
{
|
|
"circuit":0
|
|
},
|
|
{
|
|
"circuit":0
|
|
},
|
|
{
|
|
"circuit":0
|
|
},
|
|
{
|
|
"circuit":0
|
|
}
|
|
]
|
|
}
|
|
]
|
|
"""
|
|
|
|
expected = {
|
|
"areas": [
|
|
{
|
|
"area": "1",
|
|
"circuits": [
|
|
{"circuit": 0},
|
|
{"circuit": 0},
|
|
{"circuit": 0},
|
|
{"circuit": 0},
|
|
{"circuit": 0},
|
|
{"circuit": 0},
|
|
],
|
|
}
|
|
]
|
|
}
|
|
|
|
return topotest.json_cmp(output, expected, exact=True)
|
|
|
|
logger.info("Test (step 18): verify IPv6 RIB")
|
|
tgen = get_topogen()
|
|
|
|
# Skip if previous fatal error condition is raised
|
|
if tgen.routers_have_failure():
|
|
pytest.skip(tgen.errors)
|
|
|
|
logger.info("Drop traffic between rt1 and rt2")
|
|
tgen.net.cmd_raises("ip link set s1 down")
|
|
|
|
rname = "rt1"
|
|
router = tgen.gears[rname]
|
|
test_func = partial(_rt2_neigh_down, router)
|
|
success, result = topotest.run_and_expect(test_func, None, count=200, wait=0.05)
|
|
assert result is None, 'rt2 neighbor is still present on "{}"'.format(router)
|
|
|
|
router_compare_json_output(
|
|
rname,
|
|
"show ipv6 route isis json",
|
|
outputs[rname][15]["show_ipv6_route.ref"],
|
|
count=10,
|
|
wait=0.5,
|
|
)
|
|
|
|
|
|
#
|
|
# Step 19
|
|
#
|
|
# Action(s): wait for the convergence and SPF computation on rt1
|
|
#
|
|
# Expected changes:
|
|
# - convergence of IPv6 RIB
|
|
#
|
|
def test_rib_ipv6_step19():
|
|
logger.info("Test (step 19): verify IPv6 RIB")
|
|
tgen = get_topogen()
|
|
|
|
# Skip if previous fatal error condition is raised
|
|
if tgen.routers_have_failure():
|
|
pytest.skip(tgen.errors)
|
|
|
|
logger.info("Check SPF convergence")
|
|
|
|
for rname in ["rt1"]:
|
|
router_compare_json_output(
|
|
rname,
|
|
"show ipv6 route isis json",
|
|
outputs[rname][16]["show_ipv6_route.ref"],
|
|
)
|
|
|
|
|
|
#
|
|
# Step 20
|
|
#
|
|
# Action(s):
|
|
# - Unshut the switch from rt1 to rt2
|
|
#
|
|
# Expected changes:
|
|
# - The routing table goes back to the nominal state
|
|
#
|
|
def test_rib_ipv6_step20():
|
|
logger.info("Test (step 20): verify IPv6 RIB")
|
|
tgen = get_topogen()
|
|
|
|
# Skip if previous fatal error condition is raised
|
|
if tgen.routers_have_failure():
|
|
pytest.skip(tgen.errors)
|
|
|
|
rname = "rt1"
|
|
|
|
logger.info("Unsetting spf-delay-ietf init-delay of 15s")
|
|
tgen.net[rname].cmd('vtysh -c "conf t" -c "router isis 1" -c "no spf-delay-ietf"')
|
|
|
|
logger.info(
|
|
"Unshut the interface to rt2 from the switch side and check fast-reroute"
|
|
)
|
|
tgen.net.cmd_raises("ip link set s1 up")
|
|
|
|
logger.info("Setting spf-delay-ietf init-delay of 15s")
|
|
tgen.net[rname].cmd(
|
|
'vtysh -c "conf t" -c "router isis 1" -c "spf-delay-ietf init-delay 15000 short-delay 0 long-delay 0 holddown 0 time-to-learn 0"'
|
|
)
|
|
|
|
router_compare_json_output(
|
|
rname,
|
|
"show ipv6 route isis json",
|
|
outputs[rname][14]["show_ipv6_route.ref"],
|
|
)
|
|
|
|
|
|
#
|
|
# Step 21
|
|
#
|
|
# Action(s):
|
|
# - clear the rt2 ISIS neighbor on rt1
|
|
#
|
|
# Expected changes:
|
|
# - Route switchover of routes via eth-rt2
|
|
#
|
|
def test_rib_ipv6_step21():
|
|
logger.info("Test (step 21): verify IPv6 RIB")
|
|
tgen = get_topogen()
|
|
|
|
# Skip if previous fatal error condition is raised
|
|
if tgen.routers_have_failure():
|
|
pytest.skip(tgen.errors)
|
|
|
|
rname = "rt1"
|
|
|
|
logger.info("Clear the rt2 ISIS neighbor on rt1 and check fast-reroute")
|
|
tgen.gears[rname].vtysh_cmd("clear isis neighbor rt2")
|
|
|
|
router_compare_json_output(
|
|
rname,
|
|
"show ipv6 route isis json",
|
|
outputs[rname][15]["show_ipv6_route.ref"],
|
|
count=10,
|
|
wait=0.5,
|
|
)
|
|
|
|
|
|
#
|
|
# Step 22
|
|
#
|
|
# Action(s): wait for the convergence and SPF computation on rt1
|
|
#
|
|
# Expected changes:
|
|
# - convergence of IPv6 RIB
|
|
#
|
|
def test_rib_ipv6_step22():
|
|
logger.info("Test (step 22): verify IPv6 RIB")
|
|
tgen = get_topogen()
|
|
|
|
# Skip if previous fatal error condition is raised
|
|
if tgen.routers_have_failure():
|
|
pytest.skip(tgen.errors)
|
|
|
|
logger.info("Check SPF convergence")
|
|
|
|
for rname in ["rt1"]:
|
|
router_compare_json_output(
|
|
rname,
|
|
"show ipv6 route isis json",
|
|
outputs[rname][16]["show_ipv6_route.ref"],
|
|
)
|
|
|
|
|
|
#
|
|
# Step 23
|
|
#
|
|
# Action(s):
|
|
# - Setting BFD
|
|
#
|
|
# Expected changes:
|
|
# - No routing table change
|
|
# - BFD comes up
|
|
#
|
|
def test_rib_ipv6_step23():
|
|
logger.info("Test (step 23): verify IPv6 RIB")
|
|
tgen = get_topogen()
|
|
|
|
# Skip if previous fatal error condition is raised
|
|
if tgen.routers_have_failure():
|
|
pytest.skip(tgen.errors)
|
|
|
|
logger.info("Setup BFD on rt1 and rt2")
|
|
for rname in ["rt1", "rt2"]:
|
|
conf_file = os.path.join(CWD, "{}/bfdd.conf".format(rname))
|
|
tgen.net[rname].cmd("vtysh -f {}".format(conf_file))
|
|
|
|
logger.info("Set ISIS BFD")
|
|
tgen.net["rt1"].cmd('vtysh -c "conf t" -c "int eth-rt2" -c "isis bfd"')
|
|
tgen.net["rt2"].cmd('vtysh -c "conf t" -c "int eth-rt1" -c "isis bfd"')
|
|
|
|
rname = "rt1"
|
|
expect = '[{"multihop":false,"interface":"eth-rt2","status":"up"}]'
|
|
router_compare_json_output(rname, "show bfd peers json", expect)
|
|
|
|
router_compare_json_output(
|
|
rname,
|
|
"show ipv6 route isis json",
|
|
outputs[rname][14]["show_ipv6_route.ref"],
|
|
)
|
|
|
|
|
|
#
|
|
# Step 24
|
|
#
|
|
# Action(s):
|
|
# - drop traffic between rt1 and rt2 by shutting down the bridge between
|
|
# the routers. Interfaces on rt1 and rt2 stay up.
|
|
#
|
|
# Expected changes:
|
|
# - BFD comes down before IS-IS
|
|
# - Route switchover of routes via eth-rt2
|
|
#
|
|
def test_rib_ipv6_step24():
|
|
def _bfd_down(router):
|
|
output = json.loads(router.vtysh_cmd("show bfd peers json"))
|
|
expected = []
|
|
return topotest.json_cmp(output, expected, exact=True)
|
|
|
|
logger.info("Test (step 24): verify IPv6 RIB")
|
|
tgen = get_topogen()
|
|
|
|
# Skip if previous fatal error condition is raised
|
|
if tgen.routers_have_failure():
|
|
pytest.skip(tgen.errors)
|
|
|
|
logger.info("Shut the interface to rt2 from the switch side and check fast-reroute")
|
|
tgen.net.cmd_raises("ip link set s1 down")
|
|
|
|
rname = "rt1"
|
|
router = tgen.gears[rname]
|
|
test_func = partial(_bfd_down, router)
|
|
success, result = topotest.run_and_expect(test_func, None, count=30, wait=0.3)
|
|
assert result is None, 'BFD session is still up on "{}"'.format(router)
|
|
|
|
router_compare_json_output(
|
|
rname,
|
|
"show ipv6 route isis json",
|
|
outputs[rname][15]["show_ipv6_route.ref"],
|
|
count=10,
|
|
)
|
|
|
|
|
|
#
|
|
# Step 25
|
|
#
|
|
# Action(s): wait for the convergence and SPF computation on rt1
|
|
#
|
|
# Expected changes:
|
|
# - convergence of IPv6 RIB
|
|
#
|
|
def test_rib_ipv6_step25():
|
|
logger.info("Test (step 25): verify IPv6 RIB")
|
|
tgen = get_topogen()
|
|
|
|
# Skip if previous fatal error condition is raised
|
|
if tgen.routers_have_failure():
|
|
pytest.skip(tgen.errors)
|
|
|
|
logger.info("Check SPF convergence")
|
|
|
|
for rname in ["rt1"]:
|
|
router_compare_json_output(
|
|
rname,
|
|
"show ipv6 route isis json",
|
|
outputs[rname][16]["show_ipv6_route.ref"],
|
|
)
|
|
|
|
|
|
# Memory leak test template
|
|
def test_memory_leak():
|
|
"Run the memory leak test and report results."
|
|
tgen = get_topogen()
|
|
if not tgen.is_memleak_enabled():
|
|
pytest.skip("Memory leak test/report is disabled")
|
|
|
|
tgen.report_memory_leaks()
|
|
|
|
|
|
if __name__ == "__main__":
|
|
args = ["-s"] + sys.argv[1:]
|
|
sys.exit(pytest.main(args))
|