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Bekzod Fakhriddinov
Enthusiast

ospf database

Hi guys. I didn't work with ospf (only eigrp) at all so I apologies for this question in advance :) .  Here is output :

sho ip ospf database

Summary Net Link States (Area 0)

Link ID          ADV Router       Age Seq# Checksum
10.132.5.0    2.2.2.4         207          0x800040B7 0x004B59
10.132.5.0   10.200.1.3   809           0x80000731 0x008810
10.132.6.0   2.2.2.4         207        0x80000075 0x0085A0
10.132.6.0   10.200.1.3  549    0x80000075 0x000A50
10.132.12.0  2.2.2.4      207        0x800040B7 0x00FD9F

I have 2 routers advertising 10.132.5.0 and 10.132.6.0 subnets 2.2.2.4 and 10.200.1.3 . sho ip route 10.132.5.2
Routing entry for 10.132.5.0/24
Known via "ospf 1", distance 110, metric 4, type inter area
Routing Descriptor Blocks:
* 10.132.8.7, from 10.200.1.3, 16:50:39 ago, via Vlan3
Route metric is 4, traffic share count is 1

Does this mean 2.2.2.4 might be used as a backup route in case of 10.200.1.3 will fail? Is it correct to look at ospf database to see possible backup path ?

1 REPLY 1
Reza Sharifi
Hall of Fame Expert

Hi,

That is correct. Both routers are advertising both routes with one as primary and one backup. If you had equal cost to both subsets  you would see both next hops in the routing table. Right now it only shows one next hop (10.132.8.7)

HTH