Hi friends,
I have created a lab for LFA. Here I have been testing LFA on CSR-1 for 14.14.14.14/32 which is the loopback of XRv-14.
CSR-1 has been choosing CSR-2 primary (best) next hop for reaching to 14.14.14.14/32 and 123.0.0.2 (CSR-2 itself via LAV interface) as backup path.
Here CSR1 has 2 paths with same metric for backup path those are CSR2 and XRv13 and being considered CSR-2 as backup over LAN interface. My query is why did CSR-1 choose CSR-2 via LAN interface as backup path even though metric is same to XRv13 & CSR-2 via LAN interface? (Thumb rule of this selection?)
CSR-1#sh ip ospf rib 14.14.14.14
OSPF Router with ID (1.1.1.1) (Process ID 1)
Base Topology (MTID 0)
OSPF local RIB
Codes: * - Best, > - Installed in global RIB
LSA: type/LSID/originator
*> 14.14.14.14/32, Intra, cost 3, area 0
SPF Instance 38, age 00:50:38
Flags: RIB, HiPrio
via 12.0.0.2, GigabitEthernet3, label 1048578, strict label 1048578
Flags: RIB
LSA: 1/14.14.14.14/14.14.14.14
repair path via 123.0.0.2, GigabitEthernet1, label 1048578, strict label 1048578, cost 7
Flags: RIB, Repair, IntfDj, BcastDj, Downstr, LoadShare
LSA: 1/14.14.14.14/14.14.14.14
repair path via 123.0.0.13, GigabitEthernet1, cost 7
Flags: Ignore, Repair, IntfDj, BcastDj, CostWon, NodeProt, Downstr, LoadShare
LSA: 1/14.14.14.14/14.14.14.14
repair path via 14.0.0.4, GigabitEthernet2, cost 8
Flags: Ignore, Repair, IntfDj, BcastDj, NodeProt
LSA: 1/14.14.14.14/14.14.14.14
CSR-1#
-> repair path via 123.0.0.13 -Flag =Ignore <-
