From: Colin Barber (Colin.Barber@xxxxxxxxxxxxxx)
Date: Wed Aug 28 2002 - 07:14:24 GMT-3
MED is being sent from R5 in AS3 to two routers (R7 and R10) in AS1.
Therefore the two routes being compared on R7 and R10 have MED values from a
single AS.
Colin
-----Original Message-----
From: Graham, John [mailto:john.graham@cgey.com]
Sent: 28 August 2002 10:54
To: 'Colin Barber'; 'Robert Miller'; 'ccielab@groupstudy.com'
Subject: RE: Page 376 of Internet Routing by Halabi
Isn't he trying to prefer one route to a destination over another on a local
basis ?
-----Original Message-----
From: Colin Barber [mailto:Colin.Barber@telewest.co.uk]
Sent: 27 August 2002 14:32
To: 'Robert Miller'; 'ccielab@groupstudy.com'
Subject: RE: Page 376 of Internet Routing by Halabi
You shouldn't need 'always-compare-med' as the route is being advertised by
only one AS (AS3)
Colin
-----Original Message-----
From: Robert Miller [mailto:rmiller@absitech.com]
Sent: 27 August 2002 14:17
To: ccielab@groupstudy.com
Subject: RE: Page 376 of Internet Routing by Halabi
Refer to the rules for comparing Med for external
vs. internal AS's
"always-compare-med"
Robert
------------------------------------------------
On Tue, 27 Aug 2002 05:22:36 -0700 (PDT), Angelo De Guzman
<ghie_pogi@yahoo.com> wrote:
> Hi to All,
>
>
> R10 ------R7
> | /
> | /
> | /
> R5
>
> R10 and R7 in AS 1.
> R5 in AS 3
>
> My objective is for R10 to prefer the path to R7
> going into AS 5. I'm only allowed to change the metric
> to make this work. The link between R5 and R10 will
> only be used when R5 to R7 link fails.
>
> Here's my Config.
>
> R5
>
> router BGP 3
> network 172.16.220.0 mask 255.255.255.0
> neighbor 172.16.20.1 remote-as 1
> neighbor 172.16.20.1 route-map setmetric out
> neighbor 192.68.6.2 remote-as 1
> neighbor 192.68.6.2 route-map setmetric1 out
> no auto-summary
>
> route-map setmetric permit 10
> set metric 100
>
> route-map setmetric1 permit 10
> set metric 50
>
> These are the sh ip bgp for R7 and R10
>
> R10#sh ip bgp
> BGP table version is 3, local router ID is 192.68.11.1
> Status codes: s suppressed, d damped, h history, *
> valid, > best, i - internal
> Origin codes: i - IGP, e - EGP, ? - incomplete
>
> Network Next Hop Metric LocPrf Weight
> Path
> *> 172.16.220.0/24 172.16.20.2 100 0 3 i
> * i 192.68.6.1 50 100 0 3 i
> *> 192.68.11.0 0.0.0.0 0 32768 i
>
>
> R7#sh ip bgp
> BGP table version is 7, local router ID is 192.68.9.2
> Status codes: s suppressed, d damped, h history, *
> valid, > best, i - internal
> Origin codes: i - IGP, e - EGP, ? - incomplete
>
> Network Next Hop Metric LocPrf
> Weight Path
> * i172.16.220.0/24 172.16.20.2 100 100 0 3
> i
> *> 192.68.9.1 50 0 3
> i
> *>i192.68.11.0 192.68.6.2 0 100 0 i
>
> Why does R10 still prefers the link between R10 and
> R5. Eventhough the network 172.16.220.0/24 has a
> metric of 100.
> Thanks,
> Angelo
>
>
This archive was generated by hypermail 2.1.4 : Sat Sep 07 2002 - 19:48:40 GMT-3