Fast-reroute signals along the path to protect the tunnel where protection is enabled but this is not a mandatory requirement so tunnel will come up.
Protection comes in play when you identify some link in your network may go down and want to provide a backup for all fast-reroute enabled LSPs going through that link. if configured for protection then as soon as that link goes down, all protected tunnels will be rerouted on backup tunnel/path until head-end calculates a new shortest Path using running CSPF.
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...