Re: Aggregate in bgp

Thank you Mr.Scott. :)

On Tue, May 12, 2009 at 6:11 PM, Scott Morris <
smorris_at_internetworkexpert.com> wrote:

> 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
>
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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> 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 - 18:12:46 ART