Arista TOI Link
Compared with "v4 over v6 NH", the configuration is quite similar, except the interface address and neighbor use link-local address.
So the benefits here are obvious:
- Minimizing the configuration efforts, no need ipv4 and global ipv6 address.
- IPv4 NLRI over IPv6 link-local NH.
Because the link-local address is a local address and not accessible by remote devices, the bgp configure is considered to be a special one. The following regular bgp knobs don't work as usually:
- iBGP
- eBGP multi-hop
- confed BGP
- local AS if changing to iBGP
- Link-local eBGP learnt routes are not advertised to iBGP peers, because of lacking NH address
Please note that this is ONLY supported in Gated, not in multi agent mode.
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