zebra: fix showing nexthop vrf for ipv6 blackhole #17162
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For some reasons the Linux kernel associates the ipv6 blackhole of non default table the lo interface. > root@r1# ip -6 route show table 100 > root@r1# ip -6 route add unreachable default metric 4278198272 table 100 > root@r1# ip -6 route show table 100 > unreachable default dev lo metric 4278198272 pref medium As a consequence, the VRF default that owns the lo interface is shown as the nexthop VRF: > r1# show ipv6 route table 20 > Table 20: > K>* ::/0 [255/8192] unreachable (ICMP unreachable) (vrf default), 00:18:12 Do not display the nexthop VRF of a blackhole. It does not make sense for a blackhole and it was not displayed in the past. Signed-off-by: Louis Scalbert <louis.scalbert@6wind.com>
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For some reasons the Linux kernel associates the ipv6 blackhole of non default table the lo interface.
As a consequence, the VRF default that owns the lo interface is shown as the nexthop VRF:
Do not display the nexthop VRF of a blackhole. It does not make sense for a blackhole and it was not displayed in the past.