One Line Learning Posts - 3 MPLS VPLS

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  •  Kompella method, Pseudowire is signaling via BGP which is one of the methods (Juniper)
  • Martina method, pseudowire is signaling via LDP which is a second method (Cisco). This is the default method on Cisco Boxes. It does not support Autodiscover. 
  • When multihoming a VPLS site (potentially in different autonomous systems [ASs]), the PE routers connected to the same site can either be configured with the same VPLS edge (VE) device identifier or with different VE device identifiers. If you are using different VE device identifiers, you must run the Spanning Tree Protocol (STP) on the CE device, and possibly on the PE routers, to construct a loop-free VPLS topology.
  • Two VPLS NLRIs are considered equivalent from a path selection perspective if the following are the same:
    • Route distinguisher
    • VE device identifier
    • VE block offset (the default VE range of 10 is applied)
  • If two PE routers are assigned the same VE device identifier in a given VPLS, they must also advertise the same VE block size for a given VE offset. The PE routers can be configured with the same RD or with a distinct RD.
  • Cisco routers required one extra command to suppress LDP signaling for a BGP neighbor so that BGP signaling for VPLS auto-discovery is used instead (neighbor {ip-address | peer-group-name} suppress-signaling-protocol ldp)

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