BGP__Maximum Hop
1)Assign IP add: all interfaces
R1
router bgp 100
no synchronization
bgp log-neighbor-changes
network 1.1.1.0 mask 255.255.255.0
neighbor 10.1.12.2 remote-as 200
neighbor 10.1.13.3 remote-as 200
maximum-paths 2
no auto-summary
R2
router bgp 200
no synchronization
bgp log-neighbor-changes
network 2.2.2.0 mask 255.255.255.0
neighbor 10.1.12.1 remote-as 100
neighbor 10.1.23.3 remote-as 200
neighbor 10.1.23.3 next-hop-self
maximum-paths 2
R3
router bgp 200
no synchronization
bgp log-neighbor-changes
network 3.3.3.0 mask 255.255.255.0
neighbor 10.1.13.1 remote-as 100
neighbor 10.1.23.2 remote-as 200
neighbor 10.1.23.2 next-hop-self
maximum-paths 2 (cause every router have 2 paths)
-Have connection every loopback network
*Verify "ping 1.1.1.1 source 2.2.2.2 repeat 1000" from R2 and shutdown int s0/0 in R1 then the connection will down & doesn’t know another path so we need to write "maximum-paths 2” in each every routers after all ping again the path will change another to another path
Before NHS
R1
Network Next Hop Metric LocPrf Weight Path
*> 1.1.1.0/24 0.0.0.0 0 32768 i
* 2.2.2.0/24 10.1.13.3 0 200 i
*> 10.1.12.2 0 0 200 i
* 3.3.3.0/24 10.1.12.2 0 200 i
*> 10.1.13.3 0 0 200 i
R1(config-router)#
R2
Network Next Hop Metric LocPrf Weight Path
* i1.1.1.0/24 10.1.13.1 0 100 0 100 i
*> 10.1.12.1 0 0 100 i
*> 2.2.2.0/24 0.0.0.0 0 32768 i
*>i3.3.3.0/24 10.1.23.3 0 100 0 i
R2(config-router)#
R3
Network Next Hop Metric LocPrf Weight Path
* i1.1.1.0/24 10.1.12.1 0 100 0 100 i
*> 10.1.13.1 0 0 100 i
*>i2.2.2.0/24 10.1.23.2 0 100 0 i
*> 3.3.3.0/24 0.0.0.0 0 32768 i
R3(config-router)#
After NHS
R1
Network Next Hop Metric LocPrf Weight Path
*> 1.1.1.0/24 0.0.0.0 0 32768 i
* 2.2.2.0/24 10.1.12.2 0 0 200 i
*> 10.1.13.3 0 200 i
* 3.3.3.0/24 10.1.12.2 0 200 i
*> 10.1.13.3 0 0 200 i
R1(config-if)#
R2
Network Next Hop Metric LocPrf Weight Path
*> 1.1.1.0/24 10.1.12.1 0 0 100 i
* i 10.1.23.3 0 100 0 100 i
*> 2.2.2.0/24 0.0.0.0 0 32768 i
*>i3.3.3.0/24 10.1.23.3 0 100 0 i
R2(config-router)#
R3
Network Next Hop Metric LocPrf Weight Path
* i1.1.1.0/24 10.1.23.2 0 100 0 100 i
*> 10.1.13.1 0 0 100 i
*>i2.2.2.0/24 10.1.23.2 0 100 0 i
*> 3.3.3.0/24 0.0.0.0 0 32768 i
R3(config-router)#
Before Maximum Path and After Maximum Path are same
R1
Network Next Hop Metric LocPrf Weight Path
*> 1.1.1.0/24 0.0.0.0 0 32768 i
*> 2.2.2.0/24 10.1.13.3 0 200 i
*> 3.3.3.0/24 10.1.13.3 0 0 200 i
R1(config-if)#
R2
Network Next Hop Metric LocPrf Weight Path
*>i1.1.1.0/24 10.1.23.3 0 100 0 100 i
*> 2.2.2.0/24 0.0.0.0 0 32768 i
*>i3.3.3.0/24 10.1.23.3 0 100 0 i
R2(config-if)#
R3
Network Next Hop Metric LocPrf Weight Path
*> 1.1.1.0/24 10.1.13.1 0 0 100 i
*>i2.2.2.0/24 10.1.23.2 0 100 0 i
*> 3.3.3.0/24 0.0.0.0 0 32768 i
R3(config-router)#
Before Maximum Path
R1
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Loopback0
2.0.0.0/24 is subnetted, 1 subnets
B 2.2.2.0 [20/0] via 10.1.13.3, 00:07:07
3.0.0.0/24 is subnetted, 1 subnets
B 3.3.3.0 [20/0] via 10.1.13.3, 00:14:07
10.0.0.0/24 is subnetted, 2 subnets
C 10.1.13.0 is directly connected, Serial0/1
C 10.1.12.0 is directly connected, Serial0/0
R1(config-if)#
R2
1.0.0.0/24 is subnetted, 1 subnets
B 1.1.1.0 [20/0] via 10.1.12.1, 00:02:46
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback0
3.0.0.0/24 is subnetted, 1 subnets
B 3.3.3.0 [200/0] via 10.1.23.3, 00:15:08
10.0.0.0/24 is subnetted, 2 subnets
C 10.1.12.0 is directly connected, Serial1/0
C 10.1.23.0 is directly connected, FastEthernet0/0
R2(config)#
R3
1.0.0.0/24 is subnetted, 1 subnets
B 1.1.1.0 [20/0] via 10.1.13.1, 00:14:22
2.0.0.0/24 is subnetted, 1 subnets
B 2.2.2.0 [200/0] via 10.1.23.2, 00:14:22
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 2 subnets
C 10.1.13.0 is directly connected, Serial1/0
C 10.1.23.0 is directly connected, FastEthernet0/0
R3(config-router)#
After Maximum Path
R1
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Loopback0
2.0.0.0/24 is subnetted, 1 subnets
B 2.2.2.0 [20/0] via 10.1.13.3, 00:00:28
[20/0] via 10.1.12.2, 00:00:28
3.0.0.0/24 is subnetted, 1 subnets
B 3.3.3.0 [20/0] via 10.1.13.3, 00:00:28
[20/0] via 10.1.12.2, 00:00:28
10.0.0.0/24 is subnetted, 2 subnets
C 10.1.13.0 is directly connected, Serial0/1
C 10.1.12.0 is directly connected, Serial0/0
R1(config-router)#
R2
1.0.0.0/24 is subnetted, 1 subnets
B 1.1.1.0 [20/0] via 10.1.12.1, 00:05:03
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback0
3.0.0.0/24 is subnetted, 1 subnets
B 3.3.3.0 [200/0] via 10.1.23.3, 00:17:25
10.0.0.0/24 is subnetted, 2 subnets
C 10.1.12.0 is directly connected, Serial1/0
C 10.1.23.0 is directly connected, FastEthernet0/0
R2(config-router)#
R3
1.0.0.0/24 is subnetted, 1 subnets
B 1.1.1.0 [20/0] via 10.1.13.1, 00:17:45
2.0.0.0/24 is subnetted, 1 subnets
B 2.2.2.0 [200/0] via 10.1.23.2, 00:17:45
3.0.0.0/24 is subnetted, 1 subnets
C 3.3.3.0 is directly connected, Loopback0
10.0.0.0/24 is subnetted, 2 subnets
C 10.1.13.0 is directly connected, Serial1/0
C 10.1.23.0 is directly connected, FastEthernet0/0
R3(config-router)#
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