I am currently doing some lab work here and came up with a weird OSPF output and I'm not sure if this is correct or not.
I have few routers, R1, R5, R6, R4.
R5, R1, and R4 are in Area0. R5 is an internal OSPF router in area 0 and R5 and R4 are the ABRs. R5's connection to R1 is a GRE tunnel (DMVPN) and R4's connection to R5 is via a point-to-point ethernet link. R1, R4, and R6 share the same ethernet segment in area1. R6 is just an internal area1 router.
After checking the routing table, R1's route to loopback address of R5 is via R4 in area1. So it goes from R1 out to LAN segment to R4 in area1 then out to point-to-point link to R5 in area0.
R1#sh ip route 22.214.171.124 Routing entry for 126.96.36.199/32 Known via "ospf 1", distance 110, metric 21, type intra area Last update from 188.8.131.52 on FastEthernet0/1.146, 00:06:01 ago Routing Descriptor Blocks: * 184.108.40.206, from 220.127.116.11, 00:06:01 ago, via FastEthernet0/1.146 Route metric is 21, traffic share count is 1
Type escape sequence to abort. Tracing the route to 18.104.22.168
My first question, shouldn't R1's route to R5's loopback should be via the tunnel which is in area0 (backbone) and should be intra-area route? Next question is, route via R4 is through area1 so this should be inter-area?
I tried to change the router from 3700 to 7200 as I'm using GNS3, the result is different which is what I expected.
R1#sh ip route 22.214.171.124 Routing entry for 126.96.36.199/32 Known via "ospf 1", distance 110, metric 1001, type intra area Last update from 188.8.131.52 on Tunnel0, 00:12:06 ago Routing Descriptor Blocks: * 184.108.40.206, from 220.127.116.11, 00:12:06 ago, via Tunnel0 Route metric is 1001, traffic share count is 1
I understand that the metric via GRE tunnel to R5 is way higher than the metric over R4 in area1 but from what I read, intra-area should be prioritized over inter-area. Not sure why R1 is treating the connection to R4 in 18.104.22.168/24 segment as intra-area to reach 22.214.171.124 using 3700s. Not sure if it's a bug or something.
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