Chapter 50
| IP Routing Commands
Policy-based Routing for BGP
– 1165 –
prepend – Appends one or more autonomous system numbers to the AS
path of the route that is matched.
as-number – Autonomous system number. (Range: 1-4294967295)
Command Mode
Route Map
Command Usage
Note that best path selection may be influenced with this command by varying the
length of the autonomous system path.
Example
Console(config)#route-map RD permit 8
Console(config-route-map)#match peer 192.168.0.99
Console(config-route-map)#set as-path prepend 2
Console(config-route-map)#
set atomic-aggregate This command indicates the loss of some information in the route aggregation
process. Use the no form to remove this entry from a route map.
Syntax
[no] set atomic-aggregate
Command Mode
Route Map
Command Usage
The purpose of the atomic-aggregate attribute is to alert BGP speakers along the
path that some information have been lost due to the route aggregation process
and that the aggregate path might not be the best path to the destination. This
attribute should be set when the BGP speaker advertises ONLY the less-specific
prefix and suppresses more specific ones.
Example
Console(config)#route-map RD permit 9
Console(config-route-map)#match peer 192.168.0.99
Console(config-route-map)#set atomic-aggregate
Console(config-route-map)#
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