Do you have multiple links to different ISPs or multiple links to the same
ISP? If they are different, I don't know if changing the MED would have the
desired affect. With links to different ISPs, if you always want the same
link to be used to reach a given route, then your plan to advertise that
over one link only should work.
This would be true even if you are advertising a less specific aggregate to
your other ISP. The rest of the world will see the more specific route for
the network in question and will choose the desired link.
If you have two links to the same provider, you could try changing the MED
but remember that incoming traffic will usually pick the shortest AS path;
MED is considered only if the AS path is the same. So, you could try
prepending your AS number to this route update out the link you don't want
this traffic to come in on. That would make the AS path shorter on the
other link for that specific network.
I hope this makes sense, I seriously need some sleep and/or more coffee.
I'm also pretty new to this so I might be misleading you accidentally. If
so, I'm sure someone will correct me.
HTH,
John
> Depending on the requirements:
> I would use a low MED value to annouce the network out the link you want
> traffic to come in on and a high MED on the other link for this network.
> This will accomplish the desired effect of the network being reached
through
> a certain link, as well as provide redundancy incase that link fails. If
it
> fails the higher MED will be the only link available, the network will
still
> be reachable from the world until the prefered link comes back up...and
the
> origianal link will take over again because of the lower MED value.
>
>
>
>
> ""Atef Rostom"" <[EMAIL PROTECTED]> wrote in message
> 94h6j8$4fd$[EMAIL PROTECTED]">news:94h6j8$4fd$[EMAIL PROTECTED]...
> > Hi All,
> >
> > I have a 7206 with 64M RAM (not enough to host all internet routes), I
am
> > running BGP and peering with my upstream ISP's router but filtering all
> > incoming updates (low memory).
> >
> > Should this be any problem ?
> >
> > What I think is: I am using a static route to forward upstream traffic
to
> my
> > provider so I don't need the internet's routing table. I want traffic
> > destined to a certain network in my AS to reach me through this link so
I
> > will advertise this network only to that neighbor using a prefix-list.
> >
> > Please comment
> >
> > TIA, Atef
> >
> >
> > _________________________________
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>
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