Re: NSSA default route cost

answer this question, Which routes would be affected by both options? Just default or all routes in the area?

-----Original Message-----
From: mihai.grigore_at_orange-ftgroup.com

Date: Thu, 20 Aug 2009 06:21:04
To: <ccielab_at_groupstudy.com>
Subject: NSSA default route cost

Fellow experts,

I am trying to find out if there is any difference in setting the cost of the
default route injected in the NSSA area. I used the following 2 configurations
and I can see no difference in the LSA. Here we go:

first option:
==========
router ospf 1
 area 2 nssa default-information-originate
 area 2 default-cost 500

second option:
============
router ospf 1
 area 2 nssa default-information-originate metric 500

In both cases, I can see the same metric in the Type-7 LSA:

Rack1SW3#sh ip o da nssa-external 0.0.0.0

            OSPF Router with ID (150.1.9.9) (Process ID 1)

                Type-7 AS External Link States (Area 2)

  Routing Bit Set on this LSA
  LS age: 388
  Options: (No TOS-capability, No Type 7/5 translation, DC)
  LS Type: AS External Link
  Link State ID: 0.0.0.0 (External Network Number )
  Advertising Router: 150.1.3.3
  LS Seq Number: 80000003
  Checksum: 0x1FFD
  Length: 36
  Network Mask: /0
        Metric Type: 2 (Larger than any link state path)
        TOS: 0
        Metric: 500 <<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
        Forward Address: 0.0.0.0
        External Route Tag: 0

I guess there is no difference, the first configuration is the legacy while the
second one is the newer way to configure it.

Thanx, best regards, Mihai

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Received on Thu Aug 20 2009 - 10:48:42 ART