Greetings, Sorry for the dumb question, but I'm trying to work out how to set the extended communities. Anybody know how to set the Link Bandwidth Extended communities?
As defined here: https://tools.ietf.org/html/draft-ietf-idr-link-bandwidth-04 Where we're hoping to do this: http://www.juniper.net/techpubs/en_US/junos14.1/topics/topic-map/bgp-multipath-unequal.html Basically, need to set the community to: " This document defines a specific application of the two-octet AS specific extended community. IANA is requested to assign a sub- type value of 0x04 for the link bandwidth extended community. Name Value ---- ----- non-transitive Link Bandwidth Ext. Community 0x4004 " I've been reading at the data types section of the bird doco ( http://bird.network.cz/?get_doc&f=bird-5.html ), and trying different way for a while now, and just don't seem to be able to get it right. e.g. export filter { bgp_ext_community.add((4, 65300, 999)); accept; }; ( Mostly stolen from this nice example: http://bird.mpls.in/projects/mpls-bird/wiki/Bird_pe/2 ) On a juniper this is a config to apply a link bandwidth community: ------------------------- protocols { bgp { group CORE { type internal; description "core full mesh"; passive; log-updown; family inet { unicast; } family inet-vpn { unicast; } export [ beer ]; peer-as 65300; local-as 65300; multipath; neighbor 10.1.0.2 { description bird1; local-address 10.1.0.1; } } } policy-options { policy-statement beer { from { route-filter 9.9.9.9/32 exact; } then { community add beer; accept; } } community beer members bandwidth:65300:9999; } ------------------------- So the community "beer" has this value "bandwidth" which the junos knows is 0x04. In bird it looks like this: ------------------------- bird> show route 9.9.9.9/32 all 9.9.9.9/32 via 10.1.0.1 on VLAN100 [core 17:38:44] * (100/0) [i] Type: BGP unicast univ BGP.origin: IGP BGP.as_path: BGP.next_hop: 10.1.0.1 BGP.local_pref: 100 BGP.ext_community: (unknown 0x4, 65300, 1176255488) ------------------------- When tcpdump-ed the update has the values: 0x0004 ff14 461c3c00 Attached is the pcap of the bgp update with the community value set via the juniper. Kind regards, Dave
bandwidth_communities_2014_12_23.pcap
Description: application/vnd.tcpdump.pcap
