Understanding BGP Sending of Labeled and Unlabeled Unicast Routes

You can issue the neighbor send-label command to enable BGP to exchange both labeled and unlabeled unicast routes in the same address family (same AFI) over the same BGP peering session. The routes can be IPv4 or IPv6 routes. When you issue the neighbor send-label command, JunosE always proposes SAFI 4 and SAFI 1. If this command has not been configured, then JunosE proposes only SAFI 1.

A route is advertised as a labeled route within a given BGP peering session in either of the following cases:

In all other cases, the route is advertised as an unlabeled route.

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