[c-nsp] OSPF on Secondary IP addresses.

[Mark Tinka]

On Wednesday 11 June 2008, Jared Mauch wrote:

> 	No, you need to utilize the primary IP address for your
> routing protocols.  Having cisco enforce this also will
> help you make fewer mistakes in your network
> configuration, or overcomplicate the topology.

Agree, we find secondary IP addressing a symptom of bad 
network design, particularly in IP address assignment and 
scaling.

The only area where we've seen secondary IP addresses to be 
nearly unavoidable, is when co-lo customers with no router 
have to use our co-lo router as a first-Layer-3 hop. As 
their server farms grow, and they maintain one or two ports 
on our end, expanding their assignments would require 
secondary IP addresses.

Otherwise, keep the core clean. Avoid secondary IP 
addresses.

Cheers,

Mark.
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