From: Brian McGahan (brian@cyscoexpert.com)
Date: Mon Nov 04 2002 - 17:08:53 GMT-3
The BGP community no-export will restrict prefixes from being
advertised to true EBGP peers. Inter-confederate peers do not count as
true EBGP peers, therefore prefixes tagged as no-export will be
propagated between them.
The community local-as is used to prevent a prefix from being
advertised to any EBGP peer, including inter-confederate peers.
Local-AS is normally used to prevent a prefix from leaving your local
sub-as in a confederation configuration, however it may be applied in
the same manner as no-export.
http://www.cisco.com/en/US/tech/tk648/tk365/technologies_q_and_a_item091
86a00800949e8.shtml#3
HTH
Brian McGahan, CCIE #8593
Director of Design and Implementation
brian@cyscoexpert.com
CyscoExpert Corporation
Internetwork Consulting & Training
Voice: 847.674.3392
Fax: 847.674.2625
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> Guoqi Cui
> Sent: Monday, November 04, 2002 1:18 PM
> To: Louis Young; ccielab@groupstudy.com
> Cc: ccielab@groupstudy.com
> Subject: Re: BGP NO EXPORT and NO ADVERTISE attribute different
>
> If confederation is configured, the no-export
> community
> will restrict the bgp route within the global
> AS(identified by bgp confederation id #) or the
> confederation AS ( identified by the router bgp #) ?
>
>
>
>
> --- Louis Young <tonyblair@etang.com> wrote:
> > correct me if I am wrong
> > no-export community routes just can NOT get out of
> > the AS
> > no-advertise community routes just can NOT get out
> > of the ROUTER itself.
> > this applies to IBGP & EBGP neighbor both.
> >
> > ----- Original Message -----
> > From: "Tasuka Amano Hsu" <tasuka@mac.com>
> > To: "ccielab Groupstudy" <ccielab@groupstudy.com>
> > Sent: Sunday, November 03, 2002 3:11 PM
> > Subject: BGP NO EXPORT and NO ADVERTISE attribute
> > different
> >
> >
> > > Hi, some confuse here,
> > > Does the BGP community attribute NO_EXPORT is tell
> > > the EBGP peer do not export the route to it's EBGP
> > peers only, but the
> > > IBGP peers still received the routes,
> > > and NO_ADVERTISE attribute is tell the EBGP peer
> > do not advertise the
> > > routes rather it's IBGP and EBGP peers, right ?
> > >
> > > Best Regards
> > >
> > > Tasuka
>
>
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This archive was generated by hypermail 2.1.4 : Tue Dec 03 2002 - 07:22:52 GMT-3