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MARK BAKER
Enthusiast

PfR - Performance routing inbound optimization

I've been looking into PfR for optimizing inbound traffic from the internet. The two forms of adjusting the inbound traffic is BGP AS-PATH prepending and AS-PATH Community. We have a mix of ISPs that support one or the other. For the ones that support only the AS-PATH community, I'm not sure how this works under PfR. I read that out of policy will add a community up to six times to try to bring the interface back into compliance. This can't be the same community 6 times can it? Every example I see shows a single community to adjust the AS-PATH advertisement from an ISP. How do you change to community to request different levels of prepending through PfR? Our ISP has a different community depending on how many times you want to prepend your advertisement. Does PfR accept a list of communities to support this?

ISP communities:

444:1      (prepend 1)

444:2      (prepend 2)

444:3      (prepend 3)

444:4      (prepend 4)

pfr master
  border 10.4.5.6 key-chain pfr
    interface Ethernet0/1 external
      downgrade bgp community aa:nn (community number in aa:nn format)
      dinterface Ethernet0/0 internal

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