Re: distance command under ospf

Hey Chris, remember that with OSPF and distance you have to specify the RID of the advertising router, not necessarily the ip address. Did you do that?

 
Regards,

Joe Astorino
CCIE #24347 (R&S)
Sr. Support Engineer  IPexpert, Inc.
URL: http://www.IPexpert.com
 

-----Original Message-----
From: Chris Breece <cbreece1_at_gmail.com>

Date: Sun, 17 May 2009 18:56:25
To: Cisco certification<ccielab_at_groupstudy.com>
Subject: distance command under ospf

Guys,

I was working on a scenario today and got some results I wasn't expecting. I
didn't save my exact configs, but I put together the basics of how it was
setup below. If there are any typos, sorry, I did it in notepad.

R1
router ospf 1
network 10.10.10.1 0.0.0.0 area 0
redis connected route-map redis-connected metric 10 metric-type 1 subnets
!
interface fa0/0
ip address 10.10.10.1 255.255.255.0
!
interface fa0/1
ip address 192.168.0.1 255.255.255.0
!
route-map redis-connected permit 10
match interface fa0/1

R2
router ospf 1
network 10.10.10.2 0.0.0.0 area 0
distance 180 10.10.10.0 0.0.0.255 external-routes
!
int fa0/0
ip address 10.10.10.2 255.255.255.0
!
ip access-list standard external-routes
permit 192.168.0.0 0.0.0.255

The scenario was that I wanted any routes learned by R2 from R1 that were
"external" to have an AD of 180. The two routers are connected via their
Fa0/0 interfaces. R1's Fa0/1 has the subnet that will be brought into OSPF
as an external... and I was attempting to match this route via the
access-list attached to the distance command under the OSPF process on R2.

After I set this up, I looked at R2's routing table and R2 had learned it
via OSPF with an AD of 110. If I changed the 192.168.0.0/24 subnet to be
apart of Area 0, rather than an external it changed the AD to 180.

Also, when I used "distance ospf external 180" this worked fine. However, it
messed up some other requirements in the scenario, so I couldn't use it.

Is this behavior normal? Does the "distance" command not work with
externals? Or is it that I was probably just doing something wrong
elsewhere?

Chris

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Received on Mon May 18 2009 - 00:54:57 ART