RegiBoy Lv5Posted 17 Oct 2022 13:46
  
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
Naomi Lv3Posted 17 Oct 2022 14:15
  
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.
VanFlyheights Lv3Posted 17 Oct 2022 14:46
  

Loop Free Alternates (LFA) is a mechanism by which a neighbor can be used as a backup
Noah19 Lv3Posted 17 Oct 2022 14:51
  
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.
kmrnliaqat Lv3Posted 17 Oct 2022 16:05
  

Loop Free Alternate (LFA) is a mechanism by which neighbors can be used as backup hops which are then used to provide a local fixed path for traffic flowing in the event of a failure on the next main hop (node or link).
NeTSec Lv3Posted 17 Oct 2022 16:20
  
When the primary path breaks without LFA FRR, OSPF must restart SPF to locate a new path. OSPF pre-calculates a backup path when using LFA FRR, and it puts the backup next hop in the forwarding table.
BitCloud Lv3Posted 17 Oct 2022 16:28
  

OSPF Loop-Free Alternate (LFA) Fast Reroute (FRR)
Imran Tahir Lv4Posted 17 Oct 2022 16:30
  
the primary path breaks without LFA FRR, OSPF must restart SPF to locate a new path. OSPF pre-calculates a backup path when using LFA FRR, and it puts the backup next hop in the forwarding table.
gay clarin Lv2Posted 18 Oct 2022 07:58
  

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.
Newbie098542 Posted 18 Oct 2022 08:21
  
When OSPF has to select a backup path, it doesn’t just look for the “next best” lowest metric path but it uses a list of “tie breakers” to decide what path to use. This process is a bit similar to how BGP uses attributes. OSPF is able to use the following tie breakers:

    SRLG (Shared Risk Link Groups)
    Interface Protection
    Broadcast Interface Protection
    Node Protection
    Downstream Path
    Line-Card Disjoint Interfaces
    Metric

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