Re: OSPF external type-2 route load balance

From: Scott Smith (hioctane@gmail.com)
Date: Fri Aug 31 2007 - 15:49:39 ART


Bingo!

A1 learns 100.100.100.0 from both 10.43.1.61 & 10.43.1.73.

Before - BW 1536 to both ASBRs

A1(config-router)#do sh ip route ospf
     100.0.0.0/24 is subnetted, 1 subnets
O E2 100.100.100.0 [110/20] via 10.43.1.61, 00:00:36, Serial1/0.1
                                 [110/20] via 10.43.1.73, 00:00:36, Serial1/0.2

After - Dropped BW to 512 on s1/0.1

A1(config-subif)#do sh ip route ospf
     100.0.0.0/24 is subnetted, 1 subnets
O E2 100.100.100.0 [110/20] via 10.43.1.73, 00:00:06, Serial1/0.2

Then changed BW back to 1536 on s1/0.1 (now both are equal again)

A1(config-subif)#do sh ip route ospf
     100.0.0.0/24 is subnetted, 1 subnets
O E2 100.100.100.0 [110/20] via 10.43.1.73, 00:00:02, Serial1/0.2
                                 [110/20] via 10.43.1.61, 00:00:02, Serial1/0.1

The metric is a constant 20, however, for the externals OSPF also uses
the cost to the ASBR.

-- 
Scott
CCIE #17040 (R&S)

On 8/31/07, Sadiq Yakasai <sadiqtanko@gmail.com> wrote: > Can you show the Type 4 LSA database as well? > > I think the cost to the ASBR has a role to play in selecting 2 Type 5 > LSA's reporting the same prefix. > > I am not quite sure about this though. > > _______________________________________________________________________ > Subscription information may be found at: > http://www.groupstudy.com/list/CCIELab.html



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