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What was the explanation regarding confederations? That must have been sent unicast and not to the list. Based on Narbik’s response, local-as and no-export are the same? That’s how I understood that explanation. Please correct me if I am mis-understanding that.
Thanks,
Chuck
—–Original Message—– From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of John Jones Sent: Monday, June 02, 2008 9:20 PM To: ccielab@groupstudy.com Subject: Re: BGP Communities - no-export vs. local-AS
Thanks Lloyd and Narbik. I kind of figured that it could be associated with confederations.
Thanks Narbik for the detailed explanation. It looks like it is a matter of where the advertisement “boundary” lies.
John
On Mon, Jun 2, 2008 at 8:46 PM, Narbik Kocharians wrote:
> Besides the *confederation*, here are some choices: > > Let’s say you have R1 in AS 100 and R2 in AS 200. R1 needs to > advertise network 1.0.0.0/8 to R2, but it does NOT want the routers in
> AS 200 advertise that route to any of their EBGP peers, R1 can > accomplish this task in two ways: > > 1. R1 can identify the network, in this case 1.0.0.0/8, then configure
> a route-map and set the community to *no-export* and then send > community and the route-map to R2. > 2. R1 can identify the network, in this case 1.0.0.0/8, then configure
> a route-map and then set the community to *local-as* and then send the
> community and the route-map to R2. > > Now if R2 is advertising network 2.0.0.0/8 and it want that network to
> stay local (meaning in its own AS) and NOT be advertised to any EBGP > peer/s, > R2 can be configured using one of the following: > > 1. R2 can be configured to advertise network (2.0.0.0/8) using a > network statement with a route-map, and the route-map just sets the > community to * local-as*. > 2. R2 can be configured to advertise network (2.0.0.0/8) using a > network statement with a route-map, and the route-map just sets the > community to * no-export*. > > > On Mon, Jun 2, 2008 at 5:57 PM, John Jones wrote: > >> After searching the DocCD, I have been unable to find out the >> difference between these, other than they are opposite logic. >> no-export means don’t sent a BGP update out of the AS. local-AS means
>> keep the update within the AS that the router is in. >> >> Is the difference when using confederations? I can see there the >> significance, but is this the only one? >> >> Thanks, guys. >> >> John Jones >> Networking, Linux & Storage Interconnect Trainer Dell Inc. >> >> >>