• Author : Cong Du


RFC 5549: IPv4 unicast NLRI with IPv6 next-hop support

Extended Next Hop Encoding Capability This feature provides support for advertising IPv4 unicast Network Layer Reachability Information (NLRI) with IPv6 next-hops over IPv6 peering sessions described as the Extended Next Hop Encoding capability in RFC5549. Extended Next Hop Encoding capability can be supported for IPv4 unicast, IPv4 Labeled Unicast, and IPv4 VPN address and sub-address families (1/1, 1/4, 1/128 respectively). The feature enables: negotiating Extended Next Hop Encoding capability for IPv4 unicast NLRI advertisements over IPv6 BGP sessions, and encoding of the next-hop in the UPDATE message that allows determination of the next-hop’s address family. This feature is available with...
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Preserve attributes of BGP reflected routes

Starting EOS-4.15.0F, a BGP route reflector can preserve the BGP attributes (next-hop, local preference and metric) of the reflected routes. Configuration This feature can be enabled in router BGP mode with the following command: [no|default] bgp route-reflector preserve-attributes [always] The feature is disabled by default. The bgp route-reflector preserve-attributes command can turn it on. The route reflector then keeps BGP attributes from being changed by outbound policies, except for the policies configured in an outbound route map. Arista(config)#router bgp 10 Arista(config-router-bgp)#bgp route-reflector preserve-attributes To also prevent attributes from being changed by an outbound route map, one can use the always option. Arista(config-router-bgp)#bgp route-reflector...
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