I have troubles in understanding what is the difference between these two technologies in MPLS networks. Are they used for the same thing? (assuring backup path) Or maybe FRR uses LFA for calculating paths?
If we use FRR with RSVP-TE, do we need LFA? I would be glad of any clarifications on this topic.
Both IP FRR (LFA) and RSVP-TE FRR have same purpose i.e. to Fast ReRoute the traffic to a back up path in case of primary link/node/path failures. If you use RSVP TE you donot need LFA.
IP FRR doesn't use RSVP to presignal a back up tunnel. It simply uses your IGP (OSPF / ISIS).
By default IGP calculates the best path to a particular destination and installs the route in the RIB and FIB.
When IP FRR (LFA) is enabled on the IGP, along with a primary path it also calculates a back up path and install it as back up path in RIB and FIB but the back up path is not used for traffic forwarding till we have a failure.
Because we have the back up path pre-caluclated and installed in RIB and FIB(it takes the longest time) switchingover to back up path in case of a failure is very quick.
IP FRR can achieve the same protection times like RSVP-TE FRR (50ms) with out much overhead of creating back up tunnels and RSVP signalling etc.
Thank you Ashish for your answer! So to summarize. In IP networks we use IP FRR (LFA). [additionall path in FIB] In LDP enabled MPLS networks we use FRR LFA. [additional labels in LFIB] In RSVP-TE MPLS networks we use RSVP FRR. [additional RSVP tunnels] Is that correct?
6PE OverviewThe Cisco 6PE solution enables IPv6 domains to communicate with each other over an MPLS IPv4 core network. MP-BGP in the IPv4 network is used to exchange IPv6 reachability information along with a label for each IPv6 prefix announced. 6PE rout...
This document summarises various health checks that can be done on a Cisco VIM pod.
Cloud sanity checks the health status of network, storage and various openstack infrastructure components like mariadb, rabbitmq etc....
Hi - Can somebody point me to the technical details on how ASR9k refreshes the ARP cache as the cache timeout is about to expire? We are trying to understand the exact process and timing of what happens to an IP to MAC mapping in the ARP cache when ...
I'm trying to reset ASR9901, but the options (2 & 3) doesn't seem to work.When I reset after change, it boots as normal, ignoring nothing. Also I have to give the option -s (soft) -h (hard) for the reset command. Is there a different procedure for ASR...
This document and the accompanying script helps users of 64-bit IOS XR identify unnecessary files on file systems, that can lead over time to disk space shortage. A high number of showtechs or coredumps, SW packages copied to a disk are...