Q on what IGP routing protocol to use for supplying only gateway address

Howard Berkowitz hcberkowitz at hotmail.com
Thu Sep 14 19:13:22 UTC 2006

>From: "william(at)elan.net" <william at elan.net>
>To: Roland Dobbins <rdobbins at cisco.com>
>CC: nanog at nanog.org
>Subject: Re: Q on what IGP routing protocol to use for supplying only 
>gateway address
>Date: Thu, 14 Sep 2006 10:55:28 -0700 (PDT)
>On Thu, 14 Sep 2006, Roland Dobbins wrote:
>>On Sep 14, 2006, at 10:35 AM, william(at)elan.net wrote:
>>>Any suggestion as to what IGP protocol is best for this scenario?
>>This is more of a cisco-nsp question, but probably OSPF, as it's supported
>>by the routing daemons on most *NIXes out of the box.  I don't know about 
>If this was 5+ years ago, I'd have said RIP as it works great for supplying 
>only gateway address, but I want RIP to go RIP and will
>not use it again. So yes OSPF seems like best choice, but I was
>hoping something simple for gateway-only is available. I've no idea
>yet how to deal with Windows (all win2000 and win2003), anybody?

At least a few years ago, Windows OSPF was a port of Bay RS, which was 
really Wellfleet code. So far, whenever I've needed to look at Windows and 
figure out how it did something, knowing RS usually gave me the answer.
>>Are you doing anycasting or something?
>Yes, anycasting will be involved but only for very small number of
>servers (all linux) - that is kind-of separate issue. The equipment
>itself however will only see local gateway addresses (obviously), so
>it should not care or know about it.
>>If simple redundancy in the default gateway is the goal, another (and 
>>probably simpler) method is to implement HSRP or GLBP between your routers 
>>which are serving the hosts in question.
>Can't use HSRP in this case (or IVRP or whatever else its called with 
>non-cisco options) - too long to explain why.

VRRP for the non-Cisco. I've recently had to deal with some situations, in 
VoIP, where the critical Call Agents have to stay in communication even if 
physically distant. 802.1w seves nicely to share a subnet between two 
geographically separate sites. Admittedly, one can reasonably count on dual 
OC-192s, diversely routed, and each connected to two switches at either end.

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