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Dell SmartFabric OS10 User Guide Release 10.5.3

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Behavior of iBGP unnumbered with cumulus

By default, SmartFabric OS10 has next-hop-self configuration enabled for unnumbered peers under both IPv4 and IPv6 address-families.

Routes that are sent to an iBGP unnumbered peer have Next Hop resolved with Next Hop length as 32. In Cumulus, IPv4 NLRI is advertised with link-local Next Hop and Next Hop length as 16. IPv6 NLRI is advertised with Next Hop unchanged if you do not configure next-hop-self; otherwise, with next-hop-self configured with link-local address the Next hop length as 16.

IPv4 NLRI with Next Hop length as 16 is accepted only if you enable the link-local-only-nexthop command for that unnumbered peer. Otherwise, this results in an update error.

IPv6 NLRI with link-local address as Next Hop and length as 16 is accepted only if you enable the link-local-only-nexthop command for that unnumbered peer. Otherwise, this results in an update error.


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