Lab 88 - BGP Auto-Summary

Prerequisites: CCNP level skills.

Topology

Pic. 1 - Topology Diagram.

Icons designed by: Andrzej Szoblik - http://www.newo.pl

Task 1
Configure EBGP session between R1 and R4. R4 should advertise an aggregate 172.16.0.0 instead of individual subnets. Do not use 'aggregate-address' command to accomplish this.

Lab Solution

Task 1

Configure EBGP session between R1 and R4. R4 should advertise an aggregate 172.16.0.0 instead of individual subnets. Do not use 'aggregate-address' command to accomplish this.

R1 Configuration:

!

router bgp 10
 no synchronization
 bgp router-id 1.1.1.1
 bgp log-neighbor-changes
 neighbor 10.1.124.4 remote-as 40
 no auto-summary

!

R4 Configuration:

!

router bgp 40
 no synchronization
 bgp router-id 4.4.4.4
 bgp log-neighbor-changes
 network 172.16.0.0
 neighbor 10.1.124.1 remote-as 10
 auto-summary

!

Notice!
BGP 'auto-summary' command allows to use a classful 'network' statement (contrary to the situation when auto-summary is disabled). Also, when redistributing subnets into BGP, auto-summary is going to install and advertise them as classful networks.

Verification:

Pic. 2 - BGP Table on R1.