Ok - A little digging, I found "sh ip ospf rib xxx" to show cost on
primry/repair paths....Im hoping someone can explain why for this particular
dest prefix, the ASR920 sees the 7200's link as "best"....all other destination
prefixes have Gi0/0/1 as repair, but have Flags: RIB, Repair, IntfDj, BcastDj,
CostWon, NodeProt, Downstr...but for some reason, for this prefix, the
nodeprot, downstream arent "seen"?
sh ip ospf rib xxx.xxx.76.207
OSPF Router with ID (xxx.xxx.76.192) (Process ID 100)
Base Topology (MTID 0)
OSPF local RIB
Codes: * - Best, > - Installed in global RIB
LSA: type/LSID/originator
*> xxx.xxx.76.207/32, Intra, cost 226, area 0
SPF Instance 46, age 07:03:12
Flags: RIB, HiPrio
via yyy.yyy.230.174, TenGigabitEthernet0/0/26
Flags: RIB
LSA: 1/xxx.xxx.76.207/xxx.xxx.76.207
repair path via yyy.yyy.230.170, GigabitEthernet0/0/0, cost 253
Flags: RIB, Repair, IntfDj, BcastDj, NodeProt, Downstr
LSA: 1/xxx.xxx.76.207/xxx.xxx.76.207
repair path via yyy.yyy.230.168, GigabitEthernet0/0/1, cost 229
Flags: Ignore, Repair, IntfDj, BcastDj
LSA: 1/xxx.xxx.76.207/xxx.xxx.76.207
Thanks
________________________________
From: cisco-nsp <cisco-nsp-boun...@puck.nether.net> on behalf of CiscoNSP List
<cisconsp_l...@hotmail.com>
Sent: Friday, 30 September 2016 7:39 PM
To: cisco-nsp@puck.nether.net
Subject: [c-nsp] OSPF Loop-Free Alternate Fast Reroute and repair path
Hi Everyone - Have some ASR920's that have just been deployed, and have just
setup ospf+mpls on the Interpop links - One of the ASR920's has a link to a
legacy 7200, that will be retired soon, and Ive set ospf cost very high on that
link, as I dont want it used, unless all other interpop links fail....Ive
tested about 50 destination prefixes, all have the correct primary + repair
path (Being 10G link from ASR920->other POP ASR920, repair path being 1Gb
cross-link to second ASR920, then its 10Gb link->other POP ASR920)....except
one prefix....it for some reason has the correct primary path, but repair path
it has chosen is via the 7200....why it is choosing this link as repair doesnt
make sense (Based on ospf cost).....Is there anyway to check a destinations
cost on the repair path? (I can manually work it out, which I have done(And it
is way higher than the cost of the "correct" repair path)....but Im hoping I
can interrogate the ASR to find out what it sees as the cost.....because e
ven the loop of the 7200's best+repair path on the ASR920 is going via the
paths of all the other prefixes Ive checked.
Thanks in advance.
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