Hi,
VPP adds FIB entries for all IP neighbours. These are used to forward traffic
to those neighbours.
if you do:
show ip6 fib 2001:7a0:10::111/128
you’ll see more detailed output that describes the sources’of the FIB entry, A
source is the entity that added the route. The adjacency source is the entity
that adds routes for neighbours.
/neale
From: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io> on behalf of Chinmaya Aggarwal
via lists.fd.io <chinmaya.agarwal=hsc....@lists.fd.io>
Date: Tuesday, 3 August 2021 at 14:17
To: vpp-dev@lists.fd.io <vpp-dev@lists.fd.io>
Subject: [vpp-dev] FIB entry being created on peer VPP node for the localsid
Hi,
We have two VMs i.e. VM 1 and VM 2 running VPP. We are configuring localsid and
nd proxy corresponding to that localsid on VM1.
sr localsid address 2001:7a0:10::111 behavior end psp
set ip6 nd proxy GigabitEthernet0/8/0 2001:7a0:10::111
When packet on VM 2 tries tires to reach VM 1's localsid, we see that a
neighbor entry and a fib entry corresponding to that localsid is generated on
VM 2
vpp# show ip6 fib
2001:7a0:10::111/128
unicast-ip6-chain
[@0]: dpo-load-balance: [proto:ip6 index:15 buckets:1 uRPF:17 to:[4:464]]
[0] [@5]: ipv6 via 2001:7a0:10::111 GigabitEthernet0/8/0: mtu:9000 next:3
525400ed7f2052540062079586dd
fe80::/10
vpp# show ip6 neighbors
Time IP Flags Ethernet
Interface
242.5560 2001:7a0:10::111 D 52:54:00:ed:7f:20
GigabitEthernet0/8/0
Whereas, when we tried the same scenario using linux SRv6 we see that only
neighbor entry is created on VM 2 for the localsid but route table has nothing
corresponding to it.
root@ubuntu:~# ip -6 route show
::1 dev lo proto kernel metric 256 pref medium
2001:7a0:10::/64 dev ens8 proto kernel metric 256 pref medium
fe80::/64 dev ens8 proto kernel metric 256 pref medium
fe80::/64 dev ens3 proto kernel metric 256 pref medium
root@ubuntu:~# ip -6 neigh
2001:7a0:10::111 dev ens8 lladdr 52:54:00:5a:9f:9c REACHABLE
fe80::5054:ff:fe6f:d8a8 dev ens3 lladdr 52:54:00:6f:d8:a8 STALE
fe80::5054:ff:fe5a:9f9c dev ens8 lladdr 52:54:00:5a:9f:9c router REACHABLE
root@ubuntu:~#
Can anyone please guide us why VPP adds a fib entry for the localsid?
Thanks and Regards,
Chinmaya Agarwal.
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