evpn rebase to HEAD

[Pim van Pelt]

Hoi,

On 10.03.2026 15:23, Pim van Pelt via Bird-users wrote:
> However, the issue that only one such IMET makes it from evpntab to 
> etab remains, I would expect three for each VNI. 
In evpn_receive_imet(), struct rte_src *s = rt_get_source(&p->p, 
*rd_to_u64(n0->rd)*); which makes all IMET routes share the same rte_src 
(for these routes in VNI 20040, the RD is a constant 8298:200), so all 
three remote IMETs for ::1 ::2 and ::3 will get the same value of s. Is 
that intentional?

The way I understand it, each call to rte_update2() overwrites the 
previous (net, rte_src), so the last IMET received wins, the earlier two 
ones are discarded, and we end up with always one etab entry. I don't 
see how

One possible fix is to use the originator IP (n0->rtr) or perhaps the 
BGP router-id (ref->src->proto->remote_id) as the source key instead of 
the RD, so each remote IMET speaker gets its own rte_src? Perhaps 
something like evpn_imet_multipath.patch [as an example, not something I 
expect you to merge], which when applied does give me the desired outcome:

root at vpp0-0:~# birdc show route eth 00:00:00:00:00:00 vlan 100 table etab
BIRD 2.18+branch.oz.evpn.2adc66776d5d ready.
Table etab:
00:00:00:00:00:00 vlan 100 mpls 10040 unicast [evpn1 21:52:04.008] * (80)
         via 2001:678:d78:200::1 on vxlan0 mpls 10040
                      unicast [evpn1 21:52:05.449] (80)
         via 2001:678:d78:200::2 on vxlan0 mpls 10040
                      unicast [evpn1 21:52:11.849] (80)
         via 2001:678:d78:200::3 on vxlan0 mpls 10040

root at vpp0-0:~# birdc show route eth 00:00:00:00:00:00 vlan 200 table etab
BIRD 2.18+branch.oz.evpn.2adc66776d5d ready.
Table etab:
00:00:00:00:00:00 vlan 200 mpls 20040 unicast [evpn2 21:52:04.008] * (80)
         via 192.168.10.1 on vxlan0 mpls 20040
                      unicast [evpn2 21:52:05.449] (80)
         via 192.168.10.2 on vxlan0 mpls 20040
                      unicast [evpn2 21:52:11.849] (80)
         via 192.168.10.3 on vxlan0 mpls 20040

groet,
Pim

-- 
Pim van Pelt<pim at ipng.ch>
PBVP1-RIPEhttps://ipng.ch/

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