prevent loop on ospf link

From: David Deng (glend_99@yahoo.com)
Date: Thu Jan 22 2004 - 03:50:50 GMT-3


Hi Group,

Have diffuculty on preventing the loop.
Please help, let me know if any information is
missing.

    136.10.56..x
     SWa---r5 -----|
      | |------r2------r1---191.10.1.1
     SWb---r6 -----|

--------------------------------------
swa and swb have trunk link in betwwen
r5 directly connect to SWa vlan 56 in area 3
r6 directly connect to SWb vlan 56 in area 3
link between r2 to r5/r6 is FR multipoint in Area 0
---------------------------------------------

on Swa :

ping 191.10.1.1 will have missed some of the ping .
3550-A#trace 191.10.1.1

Type escape sequence to abort.
Tracing the route to 191.10.1.1

  1 136.10.56.5 4 msec
    136.10.56.6 0 msec
    136.10.56.5 0 msec
  2 *
    136.10.100.2 104 msec *
  3 136.10.12.1 108 msec * 104 msec

SW-A#sh ip route 191.10.1.1
Routing entry for 191.10.1.0/24
  Known via "bgp 65251", distance 200, metric 0
  Tag 100, type internal
  Last update from 136.10.2.2 00:30:29 ago
  Routing Descriptor Blocks:
  * 136.10.2.2, from 136.10.2.2, 00:30:29 ago
      Route metric is 0, traffic share count is 1
      AS Hops 1

SW-A#sh ip route 136.10.2.2
Routing entry for 136.10.2.2/32
  Known via "ospf 100", distance 110, metric 66, type
inter area
  Last update from 136.10.56.6 on Vlan56, 00:20:56 ago
  Routing Descriptor Blocks:
    136.10.56.5, from 136.10.5.5, 00:20:56 ago, via
Vlan56
      Route metric is 66, traffic share count is 1
  * 136.10.56.6, from 136.10.6.6, 00:20:56 ago, via
Vlan56
      Route metric is 66, traffic share count is 1

SW-A#

Thanks,
David

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