MPLS FRR is implemented in two main categories: one-to-one backup (detour LSPs) and many-to-one backup (facility backup).
With one-to-one backup, a separate backup LSP is setup on each intermediate hop (except for the penultimate hop) for each LSP that is configured for one-to-one backup. The drawback is that it doesn't scale to well given the fact that the backup tunnels are dedicated to one LSP instead of being shared by multiple LSPs.
With facility backup, backup tunnels are used to protect many LSPs. The drawback is that the backup tunnel needs to be manually configured for each facility (link or node) that needs to be protected.
Introduction: The "external-out enable" command is available for
configuration under the "router ospf process" in case of the IOS-XR
operating system. This command basically enables advertisement of
intra-area routes on the device as external routes in th...
IntroductionIn this article we'll discuss how to troubleshoot packet
loss in the asr9000 and specifically understanding the NP drop counters,
what they mean and what you can do to mitigate them. This document will
be an ongoing effort to improve troublesh...