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Old 06-14-2009, 11:28 PM
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Default Challenge: Why the BGP Neighbor is not UP?


Routers R1 and R3 are configured as following to be BGP neighbor. And router R2 has two static routes so that R1 is able to ping the interface loopback0 of R3 and R3 is able to ping the loopback0 of R1.

R1
interface loopback0
ip address 1.1.1.1 255.255.255.255
!
interface fastethernet0/0
ip address 12.1.1.1 255.255.255.0
!
router bgp 65001
no synchronization
bgp log-neighbor-changes
network 1.1.1.1 mask 255.255.255.255
neighbor 3.3.3.3 remote-as 65001
no auto-summary
!
ip route 0.0.0.0 0.0.0.0 12.1.1.2



R3
interface loopback0
ip address 3.3.3.3 255.255.255.255
!
interface fastethernet0/0
ip address 23.1.1.3 255.255.255.0
!
router bgp 65001
no synchronization
bgp log-neighbor-changes
network 3.3.3.3 mask 255.255.255.255
neighbor 1.1.1.1 remote-as 65001
no auto-summary
!
ip route 0.0.0.0 0.0.0.0 23.1.1.2




The "show ip bgp neighbors" result of R1 is displayed as following:

The BGP neighbors are not successfully established. Please select TWO possible reasons:

A. Missed the ebgp multi-hop configuration.
B. Missed the update-source configuration.
C. The no synchronization command was configured.
D. Default route was used to access the BGP neighbor.


To view the answer, please click Here
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