Re: Ignoring MED (BGP question)

1) I am not "setting MED", it's the default behavior because the routes
come from an IGP.
2) Mine is a real-world example, and the routes are coming from different
AS's.
3) The carrier should be ignoring MED simply because it's different AS's,
but they aren't because of the "always-compare-med".
4) If I were injecting the route from two CEs in the same AS into the same
carrier, I would expect them to honor MED, as that's what MED was designed
for.

In the example you gave, I would default to Marko's answer. There are other
attributes to consider before MED; but then your scenario begs the same
question of you, that you posed to me. Why set MED if you're then going to
ignore it?

An option for your scenario is to use "bgp bestpath med missing-as-worst"
since it sounds as though you are not setting MED on R2-R3.

On Sun, Nov 21, 2010 at 21:55, Jack Router <pan.router_at_gmail.com> wrote:

> I am not getting it. You set MED on your router and then tell your ISP to
> ignore it ? What is the point ?
>
> On 21 November 2010 20:27, Zack Tennant <ccie_at_tnan.net> wrote:
>
> > MED should only be compared (by default) when it's coming from the same
> AS.
> > Why do you want to ignore it? Why is setting via RM not clean? I just
> > told my carrier to ignore my MED (cause they are using
> "always-compare-med")
> > and I told them to put this on their existing RM
> >
> > route-map CUSTOMER_X_INBOUND permit 1
> > set metric=0
> > continue
> >
> > It's just that easy.
>
>
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Received on Mon Nov 22 2010 - 07:06:11 ART