From: enginedrive2002 (enginedrive2002@yahoo.ca)
Date: Wed Dec 11 2002 - 10:52:07 GMT-3
Why is it important to set precedence level for BGP routes in table? Looks
like it related to "bgp-policy ip-prec-map"?
The command reference said that the source and destination keyword of
"bgp-policy ip-prece-map" are check against source or destination address in
routing table.
Could someone explain the procedure how BGP router propagate the policy?
Thanks!
E.D.
----- Original Message -----
From: "Joe Chang" <changjoe@earthlink.net>
To: <ccielab@groupstudy.com>
Sent: December 10, 2002 4:34 PM
Subject: Re: QoS Policy Propagation via BGP.
> > In the example section of the above link, router A configuration has:
> > router bgp 30
> > table-map precedence-map
> > neighbor 20.20.20.1 remote-as 10
> > neighbor 20.20.20.1 send-community
> > neighbor 20.20.20.1 route-map precedence-map out
> >
> > What's the purpose to have "table-map precedence-map" here? What will
> happen
> > if I didn't put it into the configuration? Won't "neighbor 20.20.20.1
> > route-map precedence-map out" be enough?
>
> the route map pointed to by "table-map precedence-map" does the precedence
> level assignment for BGP routes in the routing table. Without table-map
you
> have no BGP QoS going on.
>
> >
> > "bgp-policy ip-prec-map" is an interface command, if a router running
BGP
> > process, which interfaces should be configured with this command or all?
> >
>
> What the example is missing is that there are two forms of that command:
> "bgp-policy source ip-prec-map" , applied to interfaces directly connected
> to the AS that you want to apply the QoS for, and "bgp-policy destination
> prec-map", applied to interfaces connected to BGP peers that will be
> applying QoS for traffic moving upstream to aforementioned AS.
>
> Clear as mud? That's how I feel about it too.
> .
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