When the MPLS Traffic Engineering Forwarding Adjacency feature is enabled on a TE tunnel, the link
is advertised in the IGP network as a type, length, value (TLV) 22 object without any TE sub-TLV.
From Cisco training (no link):
Fast Reroute (FRR) is a mechanism for protecting a Cisco MPLS TE LSP from link and node failures by locally repairing the LSP at the point of failure. The FRR mechanism allows data to continue to flow while the headend router attempts to establish a new end-to-end LSP that bypasses the failure. FRR locally repairs any protected LSPs by rerouting them over backup tunnels that bypass failed links or nodes.
The headend is notified of the failure through the IGP and through RSVP. The headend then attempts to establish a new LSP that bypasses the failure (LSP rerouting).
The important fact to remember is that when using fast reroute, the protection kicks in as soon as the protected interface fails, which in turn forces the head end to recalculate a new path for the dynamic Cisco MPLS TE tunnel. In that brief period of time, between when the head-end of tunnel 1 realizes that the path is invalid and when the new path is calculated, the fast reroute happens via a predefined tunnel. Fast Reroute prevents end to end traffic loss during the path recalculation.
B. Is correct.
"When the MPLS Traffic Engineering Forwarding Adjacency feature is enabled on a TE tunnel, the link
is advertised in the IGP network as a type, length, value (TLV) 22 object without any TE sub-TLV." ...THEN, "You must configure MPLS TE forwarding adjacency tunnels bidirectionally"
See section: "Restrictions for MPLS Traffic Engineering Forwarding
Adjacency":
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te_path_setup/configuration/xe-16-6/mp-te-path-setup-xe-16-6-book.pdf
Using forwarding adjacency, which allows the tunnel to be announced via OSPF or IS-IS
as a point-to-point link to other routers. To be used for data forwarding, such a traffic tunnel
has to be set up bidirectionally.
Link is broken, her is the new one:
https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/mp_te_path_setup/configuration/xe-16-6/mp-te-path-setup-xe-16-6-book/mpls-traffic-engineering-forwarding-adjacency.pdf
upvoted 2 times
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