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Configuring IP Unicast Routing
Configuring BGP
BEFORE YOU BEGIN
Enable BGP routing as described in the
DETAILED STEPS
Command
1.
configure terminal
2.
router bgp autonomous-system
3.
aggregate-address address mask
4.
aggregate-address address mask
as-set
5.
aggregate-address address-mask
summary-only
6.
aggregate-address address mask
suppress-map map-name
7.
aggregate-address address mask
advertise-map map-name
8.
aggregate-address address mask
attribute-map map-name
9.
end
10.
show ip bgp neighbors
[advertised-routes]
11.
copy running-config startup-config
To delete an aggregate entry, use the no aggregate-address address mask router configuration command. To return
options to the default values, use the command with keywords.
EXAMPLE
In the following example, an aggregate BGP address is created in router configuration mode. The path advertised for this
route will be an AS_SET consisting of all elements contained in all paths that are being summarized.
Switch(config)# router bgp 50000
Switch(config-router)# aggregate-address 10.0.0.0 255.0.0.0 as-set
In the following example, a route map called MAP-ONE is created to match on an AS-path access list. The path
advertised for this route will be an AS_SET consisting of elements contained in paths that are matched in the route map.
Switch(config)# ip as-path access-list 1 deny ^1234_
Switch(config)# ip as-path access-list 1 permit .*
Switch(config)# !
Switch(config)# route-map MAP-ONE
Switch(config-route-map)# match ip as-path 1
Switch(config-route-map)# exit
Switch(config)# router bgp 50000
Switch(config-router)# address-family ipv4
Enabling BGP Routing, page
Purpose
Enter global configuration mode.
Enter BGP router configuration mode.
Create an aggregate entry in the BGP routing table. The
aggregate route is advertised as coming from the AS, and
the atomic aggregate attribute is set to indicate that
information might be missing.
(Optional) Generate AS set path information. This
command creates an aggregate entry following the same
rules as the previous command, but the advertised path will
be an AS_SET consisting of all elements contained in all
paths. Do not use this keyword when aggregating many
paths because this route must be continually withdrawn
and updated.
(Optional) Advertise summary addresses only.
(Optional) Suppress selected, more specific routes.
(Optional) Generate an aggregate based on conditions
specified by the route map.
(Optional) Generate an aggregate with attributes specified
in the route map.
Return to privileged EXEC mode.
Verify the configuration.
(Optional) Save your entries in the configuration file.
866
850.
- Quick Links:
- Configuration Overview
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