BGP Lab1 – Configuring Basic BGP

Ensurepass

Objectives

1. To master the basic configuration methods of .

2. To master how to view the variety of BGP configuration information.

Lab Topology

17

Lab Steps

1. Configure the router’s IP address, and use the command Ping to confirm the connect’s interoperability of each router.

2. To configure BGP Routing Protocol in the R1, R2 and R3, and the configuration is shown as below:

R1(config)#router bgp 64512

R1(config-router)#neighbor 172.16.255.2 remote-as 64512

R1(config-router)#

R1(config-router)#network 172.16.255.0 mask 255.255.255.252

R1(config-router)#network 172.16.0.0 mask 255.255.255.0

R1(config-router)#network 172.16.1.0 mask 255.255.255.0

R1(config-router)#network 172.16.2.0 mask 255.255.255.0

R1(config-router)#network 172.16.3.0 mask 255.255.255.0

R1(config-router)#exit

R1(config)#

R2(config)#router bgp 64512

R2(config-router)#neighbor 172.16.255.1 remote-as 64512

R2(config-router)#neighbor 10.1.255.2 remote-as 64513

R2(config-router)#

R2(config-router)#network 172.16.255.0 mask 255.255.255.252

R2(config-router)#network 10.1.255.0 mask 255.255.255.252

R2(config-router)#exit

R2(config)#exit

R3(config)#router bgp 64513

R3(config-router)#neighbor 10.1.255.1 remote-as 64512

R3(config-router)#

R3(config-router)#network 10.1.255.0 mask 255.255.255.252

R3(config-router)#network 192.168.0.0

R3(config-router)#network 192.168.1.0

R3(config-router)#network 192.168.2.0

R3(config-router)#network 192.168.3.0

R3(config-router)#exit

R3(config)#

3. Check the neighbors relationship of BGP:

R1#show ip bgp neighbors

BGP neighbor is 172.16.255.2, remote AS 64512, internal link

BGP version 4, remote router ID 172.16.255.2

BGP state = Established, up for 00:29:25

Last read 00:00:24, hold time is 180, keepalive interval is 60 seconds

Neighbor capabilities:

Route refresh: advertised and received(old & new)

Address family IPv4 Unicast: advertised and received

Message statistics:

InQ depth is 0

OutQ depth is 0

Sent Rcvd

Opens: 1 1

Notifications: 0 0

Updates: 1 4

Keepalives: 32 32

Route Refresh: 0 0

Total: 34 37

Default minimum time between advertisement runs is 5 seconds

…………

4. Check the concise summary information of BGP.

R2#show ip bgp summary

BGP router identifier 172.16.255.2, local AS number 64512

BGP table version is 19, main routing table version 19

10 network entries using 1010 bytes of memory

11 path entries using 528 bytes of memory

3 BGP path attribute entries using 180 bytes of memory

1 BGP AS-PATH entries using 24 bytes of memory

0 BGP route-map cache entries using 0 bytes of memory

0 BGP filter-list cache entries using 0 bytes of memory

BGP using 1742 total bytes of memory

BGP activity 14/4 prefixes, 16/5 paths, scan interval 60 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd

10.1.255.2 4 64513 47 49 19 0 0 00:10:15 5

172.16.255.1 4 64512 42 45 19 0 0 00:37:53 4

5. Check the routing table of R1:

R1#show ip route

Gateway of last resort is not set

172.16.0.0/16 is variably subnetted, 5 subnets, 2 masks

C 172.16.255.0/30 is directly connected, FastEthernet0/0

C 172.16.0.0/24 is directly connected, Loopback0

C 172.16.1.0/24 is directly connected, Loopback0

C 172.16.2.0/24 is directly connected, Loopback0

C 172.16.3.0/24 is directly connected, Loopback0

10.0.0.0/30 is subnetted, 1 subnets

B 10.1.255.0 [200/0] via 172.16.255.2, 00:48:22

B 192.168.0.0/24 [200/0] via 10.1.255.2, 00:22:27

B 192.168.1.0/24 [200/0] via 10.1.255.2, 00:22:27

B 192.168.2.0/24 [200/0] via 10.1.255.2, 00:22:27

B 192.168.3.0/24 [200/0] via 10.1.255.2, 00:22:27

6. Some other commands:

R1#clear ip bgp *

R1#clear ip bgp 172.16.255.2

R1#clear ip bgp * soft

7. Lab completed.

Hope to helpful for you1





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