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Option: Configuring VPLS Nonstop
Active Routing
Nonstop active routing (NSR) enables a routing platform with
redundant Routing Engines to switch from a primary Routing Engine
to a backup Routing Engine without alerting peer nodes that a change
has occurred. Nonstop active routing uses the same infrastructure
as graceful Routing Engine switchover to preserve interface and kernel
information. However, nonstop active routing also preserves routing
information and protocol sessions by running the routing protocol
process (rpd) on both Routing Engines. The logical interface, next-hop
router, and both advertised and received labels are preserved. In
addition, nonstop active routing preserves TCP connections maintained
in the kernel.
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