From: Gabriel.Neagoe@xxxxxx
Date: Mon Apr 30 2001 - 11:15:48 GMT-3
Hello
no matter what, the routes exiting from AS254 will have 254 added on the
last position in the as-path
this is not alterable by user configuration
so BGP loop avoidance will work
just try it and check with sh ip bgp in AS1 and AS254
-----------------------------------------------
Gabriel Neagoe, GN379-RIPE
Networking solutions consultant
Cisco Certified Network Professional
Cisco Certified Design Associate
S&T Romania
tel: +401 20 40 300
fax: +401 20 40 310
-----------------------------------------------
> -----Original Message-----
> From: caolw [SMTP:caolw@fosco.com.cn]
> Sent: Monday, April 30, 2001 4:57 PM
> To: Gabriel.Neagoe@snt.ro; Groupstudy
> Subject: Re: about transit AS
>
> I do not agree with you.
> if within AS254 ,some links down,and some routes'
> as-path changed,will AS1 be a transit AS?
>
> ----- Original Message -----
> From: <Gabriel.Neagoe@snt.ro>
> To: <caolw@fosco.com.cn>; <ccielab@groupstudy.com>
> Sent: Monday, April 30, 2001 5:33 PM
> Subject: RE: about transit AS
>
>
> > the catch here is that as1 is double connected to AS254
> >
> > AS1 will never be a transit area for 254 beacuse of BGP's routing loop
> > avoidance algorythm, so you have nothing to do about it
> > BGP will do it itself
> > :-)
> >
> >
> > -----------------------------------------------
> > Gabriel Neagoe, GN379-RIPE
> > Networking solutions consultant
> > Cisco Certified Network Professional
> > Cisco Certified Design Associate
> > S&T Romania
> > tel: +401 20 40 300
> > fax: +401 20 40 310
> > -----------------------------------------------
> >
> > > -----Original Message-----
> > > From: caolw [SMTP:caolw@fosco.com.cn]
> > > Sent: Monday, April 30, 2001 10:26 AM
> > > To: Groupstudy
> > > Subject: about transit AS
> > >
> > > Hi,All:
> > >
> > > I have a question about BGP.
> > >
> > > (AS254)---r1-(AS1)-r2-(AS1)-r3--(AS254)
> > >
> > > 1. r1,r2,r3 are in AS1,
> > > 2. r1,r3 are border router.r2 is RR.
> > > peer is AS254
> > > 3. the request is:donot let AS1 become a transit AS
> > > 4. Donot use as-path filter.
> > >
> > > My answer is use Commumity attri.
> > > I let r1 and r3's incoming routes set no-export.
> > > and send-community to r2.
> > > r2 send-community to r1 r3.
> > >
> > > But I know my answer is wrong.
> > >
> > > Is anyone have any other solutions?
> > > Thanks.
> > > **Please read:http://www.groupstudy.com/list/posting.html
> > **Please read:http://www.groupstudy.com/list/posting.html
**Please read:http://www.groupstudy.com/list/posting.html
This archive was generated by hypermail 2.1.4 : Thu Jun 13 2002 - 10:30:02 GMT-3