# OSPF Loop-Free Alternate (LFA) Fast Reroute (FRR)

**URL:** https://forum.networklessons.com/t/ospf-loop-free-alternate-lfa-fast-reroute-frr/2228
**Category:** Lessons Discussion
**Created:** [September 29, 2017, 2:48pm UTC](https://forum.networklessons.com/t/ospf-loop-free-alternate-lfa-fast-reroute-frr/2228 "2017-09-29T14:48:28Z")
**Posts on this page:** 1
**Showing post:** 28

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### Author: ![acoruzzi](https://cdn-forum.networklessons.com/letter_avatar_proxy/v4/letter/a/9de0a6/32.png) [@acoruzzi](https://forum.networklessons.com/u/acoruzzi)
#### Post date: [December 16, 2019, 3:15pm UTC](https://forum.networklessons.com/t/ospf-loop-free-alternate-lfa-fast-reroute-frr/2228/28 "2019-12-16T15:15:10Z")

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excuse but i don’t understand the following command what exactly do:  
`R1(config-router)#fast-reroute per-prefix tie-break node-protecting required index 5`

you said:  
Let’s enable node protecting and change the priority to the lowest value of all currently active tie breakers  
and you show:

```
*> 5.5.5.5/32, Intra, cost 5, area 0
     SPF Instance 13, age 00:18:13
     Flags: RIB, HiPrio
      via 192.168.12.2, GigabitEthernet2 label 1048578
       Flags: RIB
       LSA: 1/5.5.5.5/5.5.5.5
      repair path via 192.168.14.4, GigabitEthernet4 label 1048578, cost 9
       Flags: RIB, Repair, IntfDj, BcastDj, NodeProt
       LSA: 1/5.5.5.5/5.5.5.5
      repair path via 192.168.13.3, GigabitEthernet3, cost 7
       Flags: Ignore, Repair, IntfDj, BcastDj, Downstr
       LSA: 1/5.5.5.5/5.5.5.5

```

the cost remain 9 for repair path via 192.168.14.4 and cost remain 7 for repair path via 192.168.13.3… i don’t understand

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