User guide

13-8 E
XTREME
W
ARE
S
OFTWARE
U
SER
G
UIDE
E
XTERIOR
G
ATEWAY
R
OUTING
P
ROTOCOLS
create bgp neighbor 192.1.1.9 as-number remote-AS-number 65001
create bgp neighbor 192.1.1.13 as-number remote-AS-number 65002
enable bgp neighbor all
config bgp add confederation-peer sub-AS-number 65001
To configure Router E, use the following commands:
create vlan ed
config vlan ed add port 1
config vlan ed ipaddress 192.1.1.13/30
enable ipforwarding vlan ed
config ospf add vlan ed area 0.0.0.0
disable bgp
config bgp as-number 65002
config bgp routerid 192.1.1.13
config bgp confederation-id 200
enable bgp
create bgp neighbor 192.1.1.14 as-number remote-AS-number 65002
enable bgp neighbor 192.1.1.14
R
OUTE
A
GGREGATION
Route aggregation is the process of combining the characteristics of several routes so
that they are advertised as a single route. Aggregation reduces the amount of
information that a BGP speaker must store and exchange with other BGP speakers.
Reducing the information that is stored and exchanged also reduces the size of the
routing table.
U
SING
R
OUTE
A
GGREGATION
To use BGP route aggregation, you must do the following:
1 Enable aggregation using the following command:
enable bgp aggregation
2 Create an aggregate route, using the following commands:
config bgp add aggregate-address <ipaddress>/<masklength> {as-set}
{summary-only} {advertise-route-map <route-map>} {attribute-route-map
<route-map>}