Re: EBGP local preference

Local preference is just that.B Its local meaning locally significant only
and it only pertains to that router deciding where to route traffic out.

http://www.cisco.com/en/US/tech/tk365/technologies_tech_note09186a00800c95bb.
shtml#localpref

Local preference is an indication to the AS about which path has preference to
exit the AS in order to reach a certain network. A path with a higher local
preference is preferred more. The default value for local preference is 100.

Unlike the weight attribute, which is only relevant to the local router, local
preference is an attribute that routers exchange in the same AS.

You set local preference with the issue of the bgp default local-preference
value command. You can also set local preference with route maps, as the
example in this section demonstrates:

The bgp default local-preference command sets the local preference on the
updates out of the router that go to peers in the same AS. In the diagram in
this section, AS256 receives updates about 170.10.0.0 from two different sides
of the organization. Local preference helps you determine which way to exit
AS256 in order to reach that network. Assume that RTD is the exit point
preference. This configuration sets the local preference for updates that come
from AS300 to 200 and for updates that come from AS100 to 150:

- Mark

----- Original Message -----

From: "amin" <amin_at_axizo.com>
To: ccielab_at_groupstudy.com
Sent: Tuesday, October 25, 2011 1:47:26 PM
Subject: EBGP local preference

Hi experts,

B

What would be the default local preference if the router received from a
route from an EBGP, I know no local preference is pass between EBGP peers,
but what value the receiving router would consider for that because once I
used show ip bgp I can't see any value for these routes at all??

B

Regards,

Amin

Blogs and organic groups at http://www.ccie.net
Received on Tue Oct 25 2011 - 19:19:26 ART