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2.  BGP USING LOOPBACK ADDRESS

HOW TO BGP USING LOOPBACK ADDRESS
 
Interface IP Address Configuration 
 
R1 
 
Interface        IP Address    Subnet Mask 
S 0                  1.1.1.1           255.0.0.0 
S 1                  3.3.3.1           255.0.0.0 
E 0                10.1.1.1          255.0.0.0 
Loopback 0  50.50.50.50  255.255.255.255 
 
 
R2 
 
Interface        IP Address    Subnet Mask 
S 0                 1.1.1.2            255.0.0.0 
S 1                 2.2.2.1            255.0.0.0 
E 0                 20.1.1.1         255.0.0.0 
Loopback 0 75.75.75.75  255.255.255.255 
  
R3 
 
Interface       IP Address            Subnet Mask 
S 0                 2.2.2.2                    255.0.0.0 
S 1                 3.3.3.2                    255.0.0.0 
E 0                 30.1.1.1                  255.0.0.0 
Loopback 0 100.100.100.100  255.255.255.255 
 
Task 1 
 
Configure a BGP neighbor relationship between R1, R2 and R3. All routers should be 
configured in AS 100. Establish the neighbor relationship based on Loopback 0 
addresses. Configure EIGRP as the routing protocol in AS 100. Advertise all loopback 
networks under EIGRP. 
 
R1 
 
Router eigrp 100 
Network 1.0.0.0 
Network 3.0.0.0 
Network 10.0.0.0 
Network 50.0.0.0 
No auto-summary 
 
Router bgp 100 
Neighbor 75.75.75.75 remote-as 100 
Neighbor 75.75.75.75 update-source loopback 0 
Neighbor 100.100.100.100 remote-as 100 
Neighbor 100.100.100.100 update-source 
loopback 0 
No synchronization 
 
R2 
 
Router eigrp 100 
Network 1.0.0.0 
Network 2.0.0.0 
Network 20.0.0.0 
Network 75.0.0.0 
No auto-summary 
 
Router bgp 100 
Neighbor 50.50.50.50 remote-as 100 
Neighbor 50.50.50.50 update-source loopback 0 
Neighbor 100.100.100.100 remote-as 100 
Neighbor 100.100.100.100 update-source loopback 0 
No synchronization
 
R3 
 
Router eigrp 100 
Network 2.0.0.0 
Network 3.0.0.0 
Network 30.0.0.0 
Network 100.0.0.0 
No auto-summary 
 
Router bgp 100 
Neighbor 50.50.50.50 remote-as 100 
Neighbor 50.50.50.50 update-source loopback 0 
Neighbor 75.75.75.75 remote-as 100 
Neighbor 75.75.75.75 update-source loopback 0 
No synchronization
 
Verification: 
 
R1#show ip bgp summary 
 
The output displays that neighbors established a TCP connection between them.
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