From: Bill Wade (wwade@xxxxxxxxx)
Date: Mon Dec 06 1999 - 00:14:44 GMT-3
With IBGP there is an IGP to get you to the loopback address which is not direc
tly atached. With EBGP, if you peer to a loopback, you need to use ebgp-multih
op.
Bill
At 12:44 AM 12/5/99 , Peter Van Oene wrote:
>I'm certainly no expert in BGP, however whenever I use looback addresses
>(which is whenever I use BGP) I always use the EBGP-Multi-hop statement.
>Given that the two loopbacks are essentially a minimum of 2 hops away, I
>would see that this command is relevant. How would the router differentiate
>it from any other network that was not directly connected?
>
>
>
>Peter Van Oene
>Senior Systems Engineer
>UNIS LUMIN Inc.
>www.unislumin.com
>Convergis Member Company
>www.convergis.com
>
>----- Original Message -----
>From: Stanislav Sinyagin <SSinyagin@mtu.ru>
>To: Martin Bander <cisco103@hotmail.com>
>Cc: <honsiong@hotmail.com>; <ccielab@groupstudy.com>
>Sent: Sunday, December 05, 1999 11:14 AM
>Subject: Re[2]: BGP Update-source
>
>
>> Ebgp-multihop is not required at all in this scenario. Your bgp
>> session is "Active" because one of your routers does not know how to
>> reach the other's loopback. You should tell it by static or dynamic
>> routing. And make sure that both point to each other's loopback and
>> have update-src loopback, or both point to other's physical interface
>> (and no updare-src at all).
>>
>> Regards,
>> Stan
>>
>> Martin Bander <cisco103@hotmail.com> wrote:
>> MB> Don't forget the ebgp-multihop comand, since r1's loopback interface
>is not
>> MB> 'directly connected' to r2.
>>
>>
>> MB> ----Original Message Follows----
>> MB> From: "hon-siong chan" <honsiong@hotmail.com>
>> MB> Reply-To: "hon-siong chan" <honsiong@hotmail.com>
>> MB> To: ccielab@groupstudy.com
>> MB> Subject: BGP Update-source
>> MB> Date: Thu, 02 Dec 1999 20:28:02 PST
>>
>> MB> I followed Sam Halabi book on configuring a simple BGP peering by
>pointing
>> MB> to a loopback interface. Scenario is as simple as follows:
>>
>> MB> -----R1 --------R2
>>
>> MB> Where R1 has a loopback interface and both are in same AS. In R1,
>command
>> MB> as:
>>
>> MB> neighbor <R2> remote-as 100
>> MB> neighbor <R2> update-source loopback 0
>>
>> MB> The peering can never be established since then. A "Sh ip bgp neigh"
>showed
>> MB> "Active" status only?!
>>
>> MB> What's wrong?
>>
>> MB> Thanks in advance....
>>
>> MB> HonSiong
>>
>>
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