[j-nsp] Loopback IP address in BGP Peering

[Mark Tinka]

On Saturday 28 February 2009 06:31:15 pm Cougar wrote:

> What kind of exception is this? In CIDR world you can use
> any address you like except first and last _LAN_
> addresses when netmask is /30 or less. With /31 and /32
> can use any address and so far I haven't seen any
> problems using x.x.x.0 or x.x.x.255 in Junipers.

That may very well be - but my suggestion is just because it 
can be done, doesn't mean it's a great idea "all around". 
These are the types of practices that come back and bite you 
due to varying levels of support for implementing .0 and 
.255 across various pieces of software. I'm not presuming 
the OP has only Junipers to deal with in their network.

Given the number of addresses one may potentially save in, 
say, a /24 sliced only for Loopbacks vs. not getting 
stressed by why this may break some things in the network; 
I'd much rather sacrifice those two addresses, thank-you-
very-much.

Keep it simple, keep it stupid, keep it unambiguous. The 
physics don't change, just how you apply them.

Then again, to each his own...

You probably want to spend some time wading through:

http://tinyurl.com/dzw4cj
http://tinyurl.com/av8rwm
http://tinyurl.com/chwjms

Mark.
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