[c-nsp] Sharing router uplinks?

Saku Ytti saku at ytti.fi
Wed Aug 1 11:46:30 EDT 2012

On (2012-08-01 08:23 -0700), Erik Nelson wrote:

> What do others think of this?  I have been unable to find anything on the web that says anything for or against. If anyone knows of authoritative guidelines on the web about this I would be very interested. 

It is doable but not optimal. It is questionable if any benefits can be
extracted in well designed network this way.

- Usually core ports with no HQoS cost significantly less than edge ports
  with HQoS. If you share core and edge, you need VLAN separation, which
  means if you plan to run any QoS in core, you need HQoS cards making this
  /more/ expensive than not sharing.

- You can possibly save port counts, but you lose hardware liveliness
  detection, as you have switch between core devices. Which means high
  convergence time (lower quality) and possibly increased complexity (BFD).


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