[c-nsp] ospf external route showing as updated quite so often in routing table

[Kumar, Prashanth]

I have  a situation where all  ospf  external routes on multiple cisco
routers showing update time refreshed. It is as if the routing table for
those routes are updated  4 to  10 sec ago.  I don't think

Routes are flapping as some of routes are only one hop away. I am
wondering if there is something in network causing this or is it a IOS
issue. I checked

this on bunch of cisco 65xx and 38xx. All are showing the same symptom.
Any help would be appreciated.  Routers are running different IOS ver
12.2 line. There is no network issue or 

high cpu I have noticied on all these routers.

 

 

Thx

Prashanth

 

If I do a show ip route

 

xxxxxxxxxx#sh ip route 159.153.4.4

Routing entry for 159.153.4.4/32

  Known via "ospf 1", distance 110, metric 202, type extern 1

  Redistributing via bgp 64700

  Last update from 10.21.252.41 on GigabitEthernet0/0, 00:00:04 ago

  Routing Descriptor Blocks:

  * 10.21.252.41, from 10.14.0.24, 00:00:04 ago, via GigabitEthernet0/0

      Route metric is 202, traffic share count is 1

 

After 10 sec

 

xxxxxxxxxx#sh ip route 159.153.4.4

Routing entry for 159.153.4.4/32

  Known via "ospf 1", distance 110, metric 202, type extern 1

  Redistributing via bgp 64700

  Last update from 10.21.252.41 on GigabitEthernet0/0, 00:00:00 ago

  Routing Descriptor Blocks:

  * 10.21.252.41, from 10.14.0.24, 00:00:00 ago, via GigabitEthernet0/0

      Route metric is 202, traffic share count is 1

 

 

But show ip ospf database external 159.153.4.4 shows LSA age
incrementing

 

 

                Type-5 AS External Link States

 

  Routing Bit Set on this LSA

  LS age: 627

  Options: (No TOS-capability, DC)

  LS Type: AS External Link

  Link State ID: 159.153.4.4 (External Network Number )

  Advertising Router: 10.14.0.24

  LS Seq Number: 8000ECE2

  Checksum: 0x6323

  Length: 36

  Network Mask: /32

        Metric Type: 1 (Comparable directly to link state metric)

        TOS: 0 

        Metric: 110 

        Forward Address: 0.0.0.0

        External Route Tag: 0