How does the frr support L3VPN for IPv4 over SRv6 BE now?

[binbinkaren]

I learnt from other router configuration case that for supporting SRV6 BE on L3VPN, the very first step is to configure IGP like ISIS to enable the SRV6 locator route advertisement. As per what I knew , the project now does not support the ISIS extension on SRv6, may I know if we have the plan to achieve the extension?

I also followed the topotest case -**bgp_srv6l3vpn_over_ipv6** but during testing the network is not working fine. does the test case also not a good one to be refered?
how does the SRV6 BE working now on current situation?

[cscarpitta]

@binbinkaren

Typically, you configure IS-IS to advertise the SRv6 locator to the other routers.
This provides reachability to the SIDs instantiated on the router.

However, currently IS-IS does not support the extensions for SRv6 (RFC 9352).
I opened a pull request a few days ago to integrate the missing extensions: isisd: Add support for SRv6 uSID (RFC 9352).

Until IS-IS supports SRv6, you need to manually configure a route to provide reachability to the SRv6 locator.

You can take these topotests as a reference to setup an SRv6-based L3VPN in BGP:

• bgp_srv6l3vpn_to_bgp_vrf (for IPv6 L3VPN)
• bgp_srv6l3vpn_to_bgp_vrf2 (for IPv4 L3VPN)
• bgp_srv6l3vpn_to_bgp_vrf3(for L3VPN, both IPv4 and IPv6 address families)

[binbinkaren]

Thanks @cscarpitta for the reply. I will follow the pull request and also, let me try those topotests you mentioned first.