BGP-LU Labeled Unicast


https://www.juniper.net/documentation/en_US/junos/topics/reference/configuration-statement/labeled-unicast-edit-protocols-bgp.html


Why Using Labeled-Unicast traffic ( single MPLS label )

https://networkengineering.stackexchange.com/questions/45221/what-are-some-use-cases-of-a-labeled-unicast-afi-safi1-4

BGP-LU is used where you need to join multiple networks together (e.g.: running distinct IGPs) while still being able to provide a transport label between any two nodes.

A couple of use cases that come to mind:

  • Large cellular backhaul network - may have 10s of thousands of base stations. It wouldn't be feasible to have these all participate in a single (say) OSPF area and distribute link-nets and loopbacks. Using BGP-LU you could break it up into regional IGPs, but still establish end-to-end LSPs across regions to a centralised head-end

  • Merging two existing networks together - you're a large ISP running OSPF as your IGP, and you acquire another large ISP running IS-IS as it's IGP. With BGP-LU you can create LSPs across these two networks without having to perform some unholy route re-distribution between two link-state protocols.


Understanding MPLS Inter-AS Link Protection

https://www.juniper.net/documentation/en_US/junos/topics/concept/mpls-inter-as-link-protection-overview.html