[f-nsp] BGP - CER2K and looking glass

[Alain Hebert]

     Well Nick,

     You missed the part where I acknowledge the inner working of BGP =D.

     And I quote:

         "( Which is pretty much normal behavior )"

     I knew of knobs in JunOS and IOS, and I was looking if anyone knew 
of any on Foundry / Brocade.

     PS: I have the feeling Brocade will not be pushing for more 
swiss-knify BGP platform soon.

     Oh, well enjoy the weekend.

-----
Alain Hebert                                ahebert at pubnix.net
PubNIX Inc.
50 boul. St-Charles
P.O. Box 26770     Beaconsfield, Quebec     H9W 6G7
Tel: 514-990-5911  http://www.pubnix.net    Fax: 514-990-9443


On 08/03/12 13:18, Nick Hilliard wrote:
> On 03/08/2012 15:01, Alain Hebert wrote:
>>      Our issues is that some CER2k are receiving routes from more than 1
>> peer and we're trying to then re-advertise them into the Looking Glass
>> servers.
> Hi Alain,
>
> You need to understand how BGP works.  When a router is sent from one RIB
> to another, it goes like this:
>
> router 1:
> 1. prefix in Loc-RIB of
> 2. outbound prefix filtering / route-maps / etc
> 3. prefix "moved" to Adj-RIB-Out on
> 4. encoded over line protocol on
> 5. sent to port 179 on router 2
>
> router 2:
> 6. line protocol is decoded on
> 7. prefix "moved" to Adj-RIB-In
> 8. inbound prefix filtering / route-maps / etc
> 9. best path calculation performed for this prefix; best path operates on
> the same prefixes.
> 10. result of best path calculation is moved to Loc RIB on router 2
>
> So what you're looking for is a copy of adj-rib-in on router 2 to be sent
> to your looking glass.  But that isn't possible because the only prefixes
> you'll get out of your CER are the results of the best path calculation in
> step 10.
>
> It may look strange that you can't tap into the adj-rib-in data sets, but
> it guarantees bgp state consistency.
>
> It would probably be possible to do what you're trying to do with the bgp
> add-path feature, but this is a relatively new feature and only supported
> on recent versions of junos, very recent versions of IOS and IOS-XR>
> 4.1.0.  I.e. Brocade don't yet support it on their netiron code base.
>
> Nick
>
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