Re: something strange about bgp community

2015-01-08 Thread Max Tulyev
Hi Song, that's normal. This is a signat to AS702 to do some special with this route when it will see this route. Community is transistive by its design, so you don't need to be directly connected to AS702 to send some signal to it. For example: you-AS101-AS102-AS103-target

Re: something strange about bgp community

2015-01-08 Thread Christopher Morrow
On Thu, Jan 8, 2015 at 9:50 AM, Max Tulyev max...@netassist.ua wrote: Some brain-dead ;) transit providers clear all community when import announces, but for me it is at least unfair. hrm, it's possible that cleaning the communities (after dealing with the local/customer-added ones) means you

Re: something strange about bgp community

2015-01-07 Thread Jared Mauch
2914:429 is a community to signal to NTT to not announce the route to peers which would perhaps be why you don't see NTT doing that. You can see the documented NTT communities here: http://www.us.ntt.net/support/policy/routing.cfm Jared Mauch On Jan 7, 2015, at 5:35 AM, Song Li

Re: something strange about bgp community

2015-01-07 Thread Christopher Morrow
On Wed, Jan 7, 2015 at 9:29 AM, Jared Mauch ja...@puck.nether.net wrote: 2914:429 is a community to signal to NTT to not announce the route to peers which would perhaps be why you don't see NTT doing that. it looks like this is the 'customer' of several networks (701, 2914) and they just

Re: something strange about bgp community

2015-01-07 Thread ML
Also note there is nothing stopping anyone from adding any community they want. The effect and how long the community stays attached to a route is another matter. On 1/7/2015 8:35 AM, Song Li wrote: Hi everyone, Today when I check one route in Routeviews I find something strange as

Re: something strange about bgp community

2015-01-07 Thread Song Li
Thanks! Because there is no standard syntax on the description of BGP community, I think the problem is hard to understand. 在 2015/1/7 23:25, joel jaeggli 写道: 2914:429 is ntt's do not advertise to any peer community bgp communities are transitive attributes, e.g. you can just pass them to

something strange about bgp community

2015-01-07 Thread Song Li
Hi everyone, Today when I check one route in Routeviews I find something strange as follows: route-viewssh ip bgp 176.108.0.0 BGP routing table entry for 176.108.0.0/19, version 23405621 Paths: (33 available, best #28, table default) Not advertised to any peer Refresh Epoch 1 202018

Re: something strange about bgp community

2015-01-07 Thread joel jaeggli
2914:429 is ntt's do not advertise to any peer community bgp communities are transitive attributes, e.g. you can just pass them to peers unmolested. so someone that's presumably not ntt ( e.g. the neighbor is digital ocean) is sending that commmunity to route views as part of their export.