[c-nsp] Traffic shaping with BGP communities

[Boštjan Fele]

Look for QPPB functionality. First mark incomming routes with community on edge router. On remote BGP peers use route-map to match communities and set IP precedence/QoS group in CEF FIB table. QoS group is internal attribute and will not modify IP packet. Apply "bgp policy destination ip-prec-map" to remark incomming packets. They you can match traffic on outgoing interface according to IP Precedence/QoS group and apply shaping.

Regards,
Bostjan

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Gordon Smith
Sent: Wednesday, March 29, 2006 4:36 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Traffic shaping with BGP communities


Hi,

I'm having a problem getting policing to work based on BGP community tags.
My intention was to set up something like this:

ip bgp-community new-format
ip community-list 2 permit xxxxx:440
ip community-list 3 permit xxxxx:150
ip community-list 4 permit xxxxx:155
!
route-map shaper permit 10
 match community 4
 set traffic-index 2
!
route-map shaper permit 20
 match community 2
 set traffic-index 1
!
route-map shaper permit 30
 match community 3
 set traffic-index 3
!
router bgp xxxxx
 table-map shaper
!
class-map aaaa
 match bgp-index 1
 exit
!
class-map bbbb
 match bgp-index 3
 exit
!
class-map cccc
 match bgp-index 2
 exit
!
policy-map zzzzz
 class aaaa
  shape average 8000000
  exit
 class bbbb
  shape average 1000000
  exit
 class cccc
  shape average 10000000
  exit

Should be pretty straightforward - class-map is selected by bgp community, then I apply shaping at the router interface with a service-policy that points to the policy-map.

Unfortunately, it appears that under the class-map hierarchy, I can't do a match on bgp-index. It's just not there as an option.

Can anyone shed any light on this? Or suggest another way of doing this?

I don't want to pass this device full route tables. I intended to only pass it a subset - enough to make policy decisions without swamping its memory.
It's a 7206 running image c7200-jk9s-mz.124-3 It talks IS-IS and BGP4

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