IPv6 BGP network advertisement

[Sumanta_Ghosh]

Hi Experts

Getting error while trying to advertise IPv6 routes in BGP peering. IPv4 works fine, but getting error in IPv6. The below network is preset in IPv6 routing table and shows as being directly connected.

(vr Test) SwitchA # configure bgp add network address-family ipv6-unicast fd01:976a:14fd:e7c0::/68

Error: vr Test: IPv6 network is not valid, must be a global unicast address and not a unique local address

[Sumanta_Ghosh]

Hi

Please see below:-

ExtremeXOS version 21.1.2.14

[Henrique]

Hi Sumanta, based on the error message you should add a Global Unicast Address.

GUA is currently defined by IPv6 prefix 2000::/3 which gives you the range below:

2000:0000:0000:0000:0000:0000:0000:0000 to 3fff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

ULA is currently defined by IPv6 prefix FC00::/7 which gives you the range below:

fc00:0000:0000:0000:0000:0000:0000:0000 to fdff:ffff:ffff:ffff:ffff:ffff:ffff:ffff

[Frank]

Your netmask, /68, is that a typo?
Because I think that /64 is the smallest size you can advertise via routing protocols.

I'm also not sure what happens when you use private V6 networks (the ones starting with fd) and put them in BGP. Part of me says it should work, but I've never tried it. Just like I've never tried putting "192.168.1.0" into BGP.

Frank

[Nick_Yakimenko]

well, if it is IGP -- why not? BGP announcements between internal routers

[Sumanta_Ghosh]

This example does not shed much light about LUA or GUA?

https://gtacknowledge.extremenetworks.com/articles/Solution/Bgp-ipv6-networks-not-transmitted-to-bgp...