Re: Question about BGP FAQ on cisco.com

From: Jason Madsen (madsen.jason@gmail.com)
Date: Wed Dec 03 2008 - 23:57:47 ARST

It's right here guys per Cisco BGP Config' Guide:

http://www.cisco.com/en/US/docs/ios/iproute/configuration/guide/irp_bgp_external_sp_ps6350_TSD_Products_Configuration_Guide_Chapter.html#wp1054131

Outbound:
1. Distribute-list
2. IP Prefix-list
3. Filter-List, As-path Access-List, or IP Policy
4. Route-Map

Inbound:
1. Route-Map
2. Filter-List, As-path Access-List, or IP Policy
3. IP Prefix-List
4. Distribute-List

Jason

On Wed, Dec 3, 2008 at 6:11 PM, Piotr <usaccie@gmail.com> wrote:

> It looks like this is the correct order:
> For outbound updates the order of preference is:
> 1. prefix-list, distribute-list
> 2. filter-list
> 3. route-map
>
> On Wed, Dec 3, 2008 at 7:10 PM, Hobbs <deadheadblues@gmail.com> wrote:
>
> > Hello,
> >
> > Please reference:
> >
> >
> http://www.ciscosystems.com/en/US/tech/tk365/technologies_q_and_a_item09186a00800949e8.shtml#
> >
> > As far as I can tell the order of operations for route filtering are
> (This
> > is the 3rd question on the FAQ):
> >
> > For inbound updates the order of preference is:
> > 1. route-map
> > 2. filter-list
> > 3. prefix-list, distribute-list
> >
> > For outbound updates the order of preference is:
> > 1. prefix-list, distribute-list
> > 2. filter-list
> > 3. route-map
> >
> > However, further down is this question and answer (5th from the bottom):
> >
> > Q. How can I filter all IP routes advertised to a BGP neighbor except the
> > default route 0.0.0.0/0?
> > A. The specific routes can be filtered if you use inbound filter-list,
> > distribute-list, prefix-list and route-map all at the same time for the
> > same
> > bgp neighbor. This is the order of operation:
> > 1. Filter-list
> > 2. Router-map
> > 3. Distribute-list (or) prefix-list
> >
> > Is this last question conflicting the previous one?
> > What's the difference between only allowing a default route as opposed to
> > only allowing certain other routes?
> >
> > thank you
> >
> >
> > Blogs and organic groups at http://www.ccie.net
> >
> > _______________________________________________________________________
> > Subscription information may be found at:
> > http://www.groupstudy.com/list/CCIELab.html
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net

This archive was generated by hypermail 2.1.4 : Thu Jan 01 2009 - 12:53:07 ARST