To change the service label mode of the VPRN for the 7750 SR, the config>service>vprn>label-mode {vrf | next-hop} command is used:
The default mode (if the command is not present in the VPRN configuration) is vrf meaning distribution of one service label for all routes of the VPRN. When a VPRN X is configured with the label-mode next-hop command the service label that it distributes with an IPv4 or IPv6 route that it exports depends on the type of route as summarized in Table: Service labels distributed in service label per next hop mode.
| Route type | Distributed service label |
|---|---|
remote route with IP A (associated with a SAP) as resolved next-hop |
platform-wide unique label allocated to next-hop A |
remote route with IP B (associated with a spoke SDP) as resolved next-hop |
platform-wide unique label allocated to next-hop B |
local route |
platform-wide unique label allocated to VPRN X |
aggregate route |
platform-wide unique label allocated to VPRN X |
ECMP route |
platform-wide unique label allocated to next-hop A (the lowest next-hop address in the ECMP set) |
BGP route with a backup next-hop (BGP FRR) |
platform-wide unique label allocated to next-hop A (the lowest next-hop address of the primary next-hops) |
A change to the label-mode of a VPRN requires the VPRN to first be shutdown.