[c-nsp] General performance based routing question?

Tassos Chatzithomaoglou achatz at forthnet.gr
Fri May 22 05:51:47 EDT 2009

In latest IOS as prepending can be used for influencing incoming traffic.

I believe there are 2 major drawbacks in PfR:

1) traffic-classes/prefixes are limited (5000), so you cannot use it in a ISP environment 
(i don't know if using multiple MCs can increase that number)
2) not-basic cli config is quite complex (PfR manager from Fluke seems to solve that one)


Benny Amorsen wrote on 22/05/2009 12:02:
> Brad Hedlund <brhedlun at cisco.com> writes:
>> No, not at all.  PFR runs locally on the router and does not rely on any
>> other routers having PFR enabled (unless you have separated the MC
>> function).  PFR makes traffic engineering decisions based on the traffic
>> measurements on your routers only.  You do not need any special
>> configuration, coordination, or support from a 3rd party.
> Does PfR do anything for incoming traffic, or is it strictly for
> outgoing traffic?
> Dynamic, automatic management of BGP-prefix-prepending and BGP
> communities would be quite neat. If Cisco solved that problem I'd be
> very impressed.
> /Benny
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