LFA (Loop free alternate)

Zonger Lv4Posted 14 Oct 2022 12:07

What is concept of LFA (Loop free alternate)? and How actually it work and where we implement to real scenario

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OSPF Loop-Free Alternate (LFA) Fast Reroute (FRR) allows OSPF to quickly switch (within 50 ms) to a backup path when a primary path fails. Without LFA FRR, OSPF has to re-run SPF to find a new path when the primary path fails. With LFA FRR, OSPF pre-computes a backup path and installs the backup next hop in the forwarding table.

Please see below picture for topology

loop free config.png (79.15 KB, Downloads: 1181)

loop free config.png
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Sangfor Jojo Lv5Posted 19 Oct 2022 14:40
  
Hello Zonger, it is suggested to ask questions about Sangfor products instead of copying some questions from the website. If you continue your action like this, we have to block your account for a month. If you are not familiar with this community, please read the Community Guidelines carefully. https://community.sangfor.com/fo ... thread&tid=3876
Brooker Lv3Posted 19 Oct 2022 12:51
  
Loop Free Alternate (LFA) is a mechanism by which neighbours can be used as backup hops
Carrot Lv3Posted 19 Oct 2022 12:38
  
To quickly switch (within 50 ms) to a backup path when a primary path fails. Without LFA FRR, OSPF has to re-run SPF to find a new path when the primary path fails.
Fisher Lv2Posted 19 Oct 2022 12:17
  
OSPF Loop-Free Alternate (LFA) Fast Reroute (FRR) allows OSPF to quickly switch (within 50 ms) to a backup path when a primary path fails.
Franky Lv3Posted 19 Oct 2022 12:07
  
OSPF Loop-Free Alternate (LFA) Fast Reroute (FRR) allows OSPF to quickly switch (within 50 ms) to a backup path when a primary path fails.
Gomu Lv2Posted 19 Oct 2022 11:20
  
OSPF pre-computes a backup path and installs the backup next hop in the forwarding table.
Randolfy Lv2Posted 19 Oct 2022 10:36
  
Per prefix LFA is a mechanism by which LFA to a non-best prefix originator can be used in lieu of the LFA to the best prefix originator to provide local repair. In such cases, per prefix LFA can be used to increase the local repair coverage for the OSPF protocol.
Jay Taruc Lv2Posted 19 Oct 2022 10:20
  
OSPF Loop-Free Alternate  Fast Reroute allows OSPF to quickly switch (within 50 ms) to a backup path when a primary path fails. Without LFA FRR, OSPF has to re-run SPF to find a new path when the primary path fails. With LFA FRR, OSPF pre-computes a backup path and installs the backup next hop in the forwarding table.
KarenD Lv2Posted 19 Oct 2022 10:15
  
SPF to find a new path when the primary path fails. With LFA FRR, OSPF pre-computes a backup path and installs the backup next hop in the forwarding table.
Racoon Lv2Posted 19 Oct 2022 10:01
  
To quickly switch (within 50 ms) to a backup path when a primary path fails. Without LFA FRR, OSPF has to re-run SPF to find a new path when the primary path fails. With LFA FRR, OSPF pre-computes a backup path and installs the backup next hop in the forwarding table.

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