ip forwarding
ipv6 forwarding

int eth-sw
 ip addr 192.168.2.9/24
 ipv6 address fd00:0:2::9/64

int eth-r5
 ip addr 192.168.3.9/24
 ipv6 address fd00:0:3::9/64

int eth-r6
 ip addr 192.168.4.9/24
 ipv6 address fd00:0:4::9/64

int lo
 ip addr 10.9.9.9/32
 ipv6 address 2001:db8::9/128