[c-nsp] Sharing router uplinks?

[Mark Tinka]

On Thursday, August 02, 2012 05:18:54 PM Wayne Tucker wrote:

> I've found that a lot of NMSs don't handle the shared
> segments well. Point to point links are easy to plot and
> monitor - both because they're 1:1 and because if your
> IGP does adjacencies you can monitor for neighbors != 1.

Agree, but it's a compromise between what your NMS complains 
about and whether you can afford such a topology.

Imagine situations where some of the routers in the core are 
busier than others, and with a point-to-point topology, you 
have to provision multiple links (probably as LAG's) between 
the core router and some edge routers, while the rest will 
run as single or fewer links. And all the while, you have 
certain ports on the core router that are heavily 
underutilized.

The problem becomes worse if your PoP grows with a lot more 
such devices. Perhaps you host a CDN, it's a video head end, 
it's your only PoP so all customers terminate there, e.t.c.

Cheers,

Mark.
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 836 bytes
Desc: This is a digitally signed message part.
URL: <https://puck.nether.net/pipermail/cisco-nsp/attachments/20121001/fb0f8fb3/attachment.sig>