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Chapter 8: BGP Configuration Guide
EBGP Aggregation Example
Figure 16
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 IA8 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
128
shows a simple EBGP configuration in which one peer is exporting an
194.109.86.6
IA8
Figure 16. Sample BGP Configuration (Route Aggregation)
AS-64901
194.109.86.5
Legend:
Physical Link
Peering Relationship
Internet Appliance User Reference Manual
IA9
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