LAB 9: Configure BGP Confederation

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Claud Pierce
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1 BGP

2 BGP Topology Page1

3 LAB 9: Configure BGP Confederation Task 1: Configure IPv4 BGP Process for Autonomous Step 1. In the configuration mode of router configure IPv4 BGP Process by following command: R1: router bgp 100 neighbor remote-as neighbor soft-reconfiguration inbound address-family ipv4 network mask network mask network mask R2: router bgp neighbor remote-as neighbor soft-reconfiguration inbound neighbor remote-as 100 neighbor soft-reconfiguration inbound address-family ipv4 network mask network mask network mask R3: router bgp neighbor remote-as neighbor soft-reconfiguration inbound neighbor remote-as neighbor soft-reconfiguration inbound address-family ipv4 network mask network mask network mask Page2

4 R4: router bgp neighbor remote-as neighbor soft-reconfiguration inbound address-family ipv4 network mask network mask network mask Step 2. In the configuration mode of router configure IPv4 OSPF Process by following command: R1: router ospf 1 network area 0 R2: router ospf 1 network area 0 R3: router ospf 1 network area 0 R4: router ospf 1 network area 0 Page3

5 Step 3. Verify IPv4 BGP routes by following command: R1#show ip bgp BGP table version is 13, local router ID is *> / i *> / i *> / i *> / i *> / i *> / i *> / i *> / i *> / i *> / i *> / i *> / i R2#show ip bgp BGP table version is 13, local router ID is *> / i *> / i *> / i *> / i *> / i *> / i *> / i *> / i *> / i *> / i *> / i *> / i Page4

6 R3#show ip bgp BGP table version is 13, local router ID is *> / i *> / i *> / i *> / i *> / i *> / i *> / i *> / i *> / i *>i / i *>i / i *>i / i R4#show ip bgp BGP table version is 13, local router ID is *>i / i *>i / i *>i / i *>i / i *>i / i *>i / i *>i / i *>i / i *>i / i *> / i *> / i *> / i Page5

7 Task 2: Configure IPv4 BGP Confederation Step 1. In the configuration mode of router configure IPv4 BGP confederation by following command: R1: router bgp 100 neighbor remote-as 200 R2: router bgp bgp confederation identifier 200 bgp confederation peers R3: router bgp bgp confederation identifier 200 bgp confederation peers R4: router bgp bgp confederation identifier 200 Page6

8 Step 2. Verify IPv4 BGP routes by following command: R1#show ip bgp BGP table version is 13, local router ID is *> / i *> / i *> / i *> / i *> / i *> / i *> / i *> / i *> / i *> / i *> / i *> / i R2#show ip bgp BGP table version is 13, local router ID is *> / i *> / i *> / i *> / i *> / i *> / i *> / (65001) i *> / (65001) i *> / (65001) i *> / (65001) i *> / (65001) i *> / (65001) i Page7

9 R3#show ip bgp BGP table version is 25, local router ID is *> / (65002) 100 i *> / (65002) 100 i *> / (65002) 100 i *> / (65002) i *> / (65002) i *> / (65002) i *> / i *> / i *> / i *>i / i *>i / i *>i / i R4#show ip bgp BGP table version is 25, local router ID is *>i / (65002) 100 i *>i / (65002) 100 i *>i / (65002) 100 i *>i / (65002) i *>i / (65002) i *>i / (65002) i *>i / i *>i / i *>i / i *> / i *> / i *> / i Page8

10 Task 3: Verify BGP Path Selection in BGP confederation Step 1. In the configuration mode of router configure redundant path by following command: R1: interface ethernet 0/0 ip address no shutdown router bgp 100 neighbor remote-as 200 neighbor soft-reconfiguration inbound R4: interface ethernet 0/0 ip address no shutdown router bgp neighbor remote-as 100 neighbor soft-reconfiguration inbound Page9

11 Step 2. Verify IPv4 BGP routes by following command: R1#show ip bgp BGP table version is 37, local router ID is *> / i *> / i *> / i * / i *> i * / i *> i * / i *> i * / i * / i * / i * / i * / i * / i R1 is choosing via R2 as best path instead of to R4, R1 is choosing longest path as best path instead of choosing shortest path. R1#traceroute Type escape sequence to abort. Tracing the route to VRF info: (vrf in name/id, vrf out name/id) msec 8 msec 9 msec msec 9 msec 8 msec Page10

OSPF with Multi Area Adjacency Configuration Example

OSPF with Multi Area Adjacency Configuration Example Document ID: 118879 Contributed by Narra Naukwal, Cisco TAC Engineer. Mar 31, 2015 Contents Introduction Prerequisites Requirements Components Used