Ebgp Aggregation Example - Cabletron Systems SmartSwitch Router User's Reference Manual

EBGP Aggregation Example

Figure 9 shows a simple EBGP configuration in which one peer is exporting an aggregated
route to its upstream peer and restricting the advertisement of contributing routes to the
same peer. The aggregated route is 212.19.192.0/19.
AS-64900
212.19.199.62/24
212.19.198.1/24
212.19.192.2/24
Router SSR8 has the following CLI configuration:
interface add ip xleapnl address-netmask 212.19.192.2/24
interface create ip hobbygate address-netmask 212.19.199.62/24 port
et.1.2
interface create ip xenosite address-netmask 212.19.198.1/24 port
et.1.7
interface add ip lo0 address-netmask 212.19.192.1/30
bgp create peer-group webnet type external autonomous system 64901
bgp add peer-host 194.109.86.5 group webnet
#
# Create an aggregate route for 212.19.192.0/19 with all its subnets as
# contributing routes
#
ip-router policy summarize route 212.19.192.0/19
ip-router policy redistribute from-proto aggregate to-proto bgp target-
as 64901 network 212.19.192.0/19
ip-router policy redistribute from-proto direct to-proto bgp target-as
64901 network all restrict
SmartSwitch Router User Reference Manual
194.109.86.6
SSR8
Figure 9. Sample BGP Configuration (Route Aggregation)
Chapter 6: BGP Configuration Guide
AS-64901
194.109.86.5
Legend:
Physical Link
Peering Relationship
SSR9
101