>thanks , but can you be more precise who does
>auto-summmary and injecting routes into IGP my
>customer or his customer or my upstream providers
>
>
>regards,
>
>suaveguru
1. In global Internet operations, no one should do auto-summary.
Summarization needs to be planned.
2. It is rarely a good idea to inject any external routes into
an IGP. This may make sense as part of a traffic engineering
strategy, but you really need to know what you are doing.
3. Before you can say who does what injection into BGP, you have
to define the associated routing policy. Let's say you have
a customer with two sites, using address space you have delegated
to them. It does make sense for the customer routes to be advertised
into your AS, assuming the customer links to you with a private AS number
and BGP.
If you only have one connection to the upstream, however, the upstream
can't do anything useful with the customer-specific information. It
should just see the aggregate.
If you have multiple connections to the upstream, more-specifics may
be useful if your contract covers them. Your upstream, however, has
no reason to advertise your more-specifics to its upstream, if the two
are connected only at one point.
>--- Ilya Mazhara <[EMAIL PROTECTED]> wrote:
>> Hmmm.. Looks like somobody inject this routes into
>> IGP
>> and does auto-summary at him exiting router.
>>
>> suaveguru wrote:
>> >
>> > hi all,
>> > I have a question regarding announcement of routes
>> via
>> > BGP.
>> >
>> > Well we are an INTERNET BACKBONE FOR our customers
>> who
>> > are ISPs .
>> >
>> > As a result we have many upstream providers like
>> AT&T
>> > , ABOVENET etc.
>> >
>> > Recently our customers just have this new network
>> > blocks namely 146.222.185.0 /24, 146.222.186.0 /24
>> and
>> > 146.222.195.0 /24
>> >
>> > At our side we have confirmed annoucing them
>> >
>> > At our upstream providers we have also confirmed
>> that
>> > they are announcing them
>> >
>> > but when I go to AT&T route server to do a bgp of
>> > these networks they seem to only recognise the
>> > supernet
>> >
>> > as show below
>> > route-server.ip.att.net> sh ip bgp 146.222.185.0
>> >
>> > BGP routing table entry for 146.222.0.0/16,
>> version
>> > 13292503
>> > Paths: (18 available, best #14)
>> > Not advertised to any peer
>> > 7018 174 12018, (received & used)
>> > 12.123.29.249 from 12.123.29.249
>> (12.123.29.249)
>> > Origin IGP, localpref 100, valid, external
>> > Community: 0:5000
>> >
>> > ...
>> >
>> > AT&T sees the /16 supernet and not the specific
>> that I
>> > am sending you
>> >
>> > __________________________________________________
>> > Do You Yahoo!?
>> > Get email at your own domain with Yahoo! Mail.
>> > http://personal.mail.yahoo.com/
>> >
>> > _________________________________
>> > FAQ, list archives, and subscription info:
>> http://www.groupstudy.com/list/cisco.html
>> > Report misconduct and Nondisclosure violations to
>[EMAIL PROTECTED]
>
>
>__________________________________________________
>Do You Yahoo!?
>Get email at your own domain with Yahoo! Mail.
>http://personal.mail.yahoo.com/
>
>_________________________________
>FAQ, list archives, and subscription info:
>http://www.groupstudy.com/list/cisco.html
>Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
_________________________________
FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html
Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
