Rip Metric Propagation In Vprns; Figure 138: Rip Metric Propagation In Vprns - Alcatel-Lucent 7750 SR Manual

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Virtual Private Routed Network Services

RIP Metric Propagation in VPRNs

When RIP is used as the PE-CE protocol for VPRNs (IP-VPNs), the RIP metric is only used by

the local node running RIP with the Customer Equipment (CE). The metric is not used to or

encoded into and MP-BGP path attributes exchanged between PE routers.

The RIP metric can also be used to exchanged between PE routers so if a customer network is dual

homed to separate PEs the RIP metric learned from the CE router can be used to choose the best

route to the destination subnet. By using the learned RIP metric to se the BGP MED attribute,

remote PEs can choose the lowest MED and in turn the PE with the lowest advertised RIP metric

as the preferred egress point for the VPRN.

MP-BGP: 128.1.1.0/24

128.1.1.0/24

RIP: 128.1.1.0/24

Metric: 2 + Interface

7750 SR OS Services Guide