Kita masih menggunakan topologi pada lab sebelumnya. Kita tambahkan beberapa ip loopback di R4 yang nantinya akan di aggregate.
R4
R4(config)#int lo1
R4(config-if)#ip add 4.1.1.1 255.255.255.255 R4(config-if)#int lo2
R4(config-if)#ip add 4.2.1.1 255.255.255.255 R4(config-if)#int lo3
R4(config-if)#ip add 4.3.1.1 255.255.255.255 R4(config-if)#int lo4
R4(config-if)#ip add 4.4.1.1 255.255.255.255 R4(config-if)#int lo5
R4(config-if)#ip add 4.5.1.1
R2
R2(config)#do sh ip bgp
Network Next Hop Metric LocPrf Weight Path
*> 4.1.1.1/32 24.24.24.4 0 0 4 i
*> 4.2.1.1/32 24.24.24.4 0 0 4 i
*> 4.3.1.1/32 24.24.24.4 0 0 4 i
*> 4.4.1.1/32 24.24.24.4 0 0 4 i
*> 4.4.4.4/32 24.24.24.4 0 0 4 i
*> 4.5.1.1/32 24.24.24.4 0 0 4 i
*> 4.6.1.1/32 24.24.24.4 0 0 4 i
R4
R4(config)#router bgp 4
R4(config-router)#aggregate-address 4.0.0.0 255.248.0.0
R2
R2(config)#do show ip bgp
Network Next Hop Metric LocPrf Weight Path
*> 4.0.0.0/13 24.24.24.4 0 0 4 i
*> 4.1.1.1/32 24.24.24.4 0 0 4 i
*> 4.2.1.1/32 24.24.24.4 0 0 4 i
*> 4.3.1.1/32 24.24.24.4 0 0 4 i
*> 4.4.1.1/32 24.24.24.4 0 0 4 i
*> 4.4.4.4/32 24.24.24.4 0 0 4 i
*> 4.5.1.1/32 24.24.24.4 0 0 4 i
*> 4.6.1.1/32 24.24.24.4 0 0 4 i
R4
R4(config)#router bgp 4
R4(config-router)#aggregate-address 4.0.0.0 255.248.0.0 summary-only
R2
R2(config)#do show ip bgp
Network Next Hop Metric LocPrf Weight Path
*> 4.0.0.0/13 24.24.24.4 0 0 4 i
R4
R4(config)#access-list 1 permit host 4.2.1.1
R4(config)#access-list 1 permit host 4.3.1.1
R4(config)#access-list 1 permit host 4.4.1.1 R4(config)#access-list 1 deny any
R4(config)#do show ip bgp
Network Next Hop Metric LocPrf Weight Path
*> 4.0.0.0/13 0.0.0.0 32768 i
*> 4.1.1.1/32 0.0.0.0 0 32768 i
s> 4.2.1.1/32 0.0.0.0 0 32768 i
s> 4.3.1.1/32 0.0.0.0 0 32768 i
s> 4.4.1.1/32 0.0.0.0 0 32768 i
*> 4.4.4.4/32 0.0.0.0 0 32768 i
*> 4.5.1.1/32 0.0.0.0 0 32768 i
*> 4.6.1.1/32 0.0.0.0 0 32768 i
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