Re: Aggregate in bgp

Correct. While IGPs can be more flexible in the masking because they
are just tagging interfaces, BGP cannot. it must specifically match
what you see with "show ip route (ip)".

HTH,

*Scott Morris*, CCIE/x4/ (R&S/ISP-Dial/Security/Service Provider) #4713,

JNCIE-M #153, JNCIS-ER, CISSP, et al.

JNCI-M, JNCI-ER

smorris_at_internetworkexpert.com

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marish shah wrote:
> Thanks Mr.Scott and Mr.Bryan for ur reply.As I understand Network
> command in bgp different then IGP in bgp we should match our network
> command with interface.mean if I have interface loopback with /24 then
> in network command mask should be 255.255.255.0 other wise it will
> work.I'm right ?
> Because BGP import routes from RIB to its Local RIB ..
>
>
> Thanks.
>
> On Tue, May 12, 2009 at 5:35 PM, Scott Morris
> <smorris_at_internetworkexpert.com
> <mailto:smorris_at_internetworkexpert.com>> wrote:
>
> Just to further clarify... Even if you used the network command
> with a /16 mask in other protocols it would not create an
> all-inclusive route either. That's the job of
> summarization/aggregation to do that.
> HTH,
>
> Scott
>
>
> marish shah wrote:
>
> HI Expert,
> One Q, I'm doing one lab of bgp in this lab
> there is one
> task ( Advertise 155.1.0.0 with ,mask 255.255.0.0 to external
> ebgp router)
> now he did this thing through aggregate-address
>
> R6 which is connected with BB1 .R1 in bgp 100 and BB1 in bgp 54
> So on R6 configuration for advertise 155.1.0.0 255.255.0.0 to BB1
>
> R6
>
> neighbor 54.1.1.254 remote-as 54
> aggregate-address 155.1.0.0 mask 255.255.0.0
>
>
> So my Q is why he use this aggregate to advertise subnet .Y he
> didn't use
> network command ( network 155.1.0.0 mask 255.255.0.0 ) .
>
> If this Q is silly so plz forgive me but I really want to
> know y he did'nt
> do through this why.
>
> Thanks.
>
>
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Received on Tue May 12 2009 - 11:11:36 ART