From: Joe Chang (changjoe@earthlink.net)
Date: Thu Dec 12 2002 - 15:01:44 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"?
1) See answer #3 below.
> 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.
2) Interfaces with "bgp-policy <source|destination> ip-prec-map" assign
precedence values on incoming packets based on whether the source or
destination ip address has an associated precedence in the CEF table.
Working backward, BGP routing table entries are mapped to precedence values
based on the route-map pointed to by the "table-map" command. The results of
that mapping are stored in the CEF table.
> Could someone explain the procedure how BGP router propagate the policy?
3) Cisco seems to equate "policy propagation" as the assignment of
precedence to IP packets. How he local AS implements QoS (CAR, WRED, etc.)
is still configured on each individual router manually.
Can anyone out there who has worked with this feature please shed some
light? I too am working from the documentation and the "IP Quality of
Service" book from Cisco. The way it's been presented makes it seem a lot
more complicated than it actually is.
.
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