Which command can you enter to verify that a BGP connection to a remote device is established?

Question:
Which command can you enter to verify that a BGP connection to a remote device is established?

• show ip bgp summary
• show ip community-list
• show ip bgp paths
• show ip route

Explanation: This command can be used to verify if a BGP connection to a BGP neighbor is good or not. Let’s see an example:

Please pay attention to the “State/PfxRcd” column of the output. It indicates the number of prefixes that have been received from a neighbor. If this value is a number (including “0”, which means BGP neighbor does not advertise any route) then the BGP neighbor relationship is good. If this value is a word (including “Idle”, “Connect”, “Active”, “OpenSent”, “OpenConfirm”) then the BGP neighbor relationship is not good.

In the outputs above we see the BGP neighbor relationship between R1 & 10.1.1.1 is good with 2 Prefix Received (PfxRcd) while the BGP neighbor relationships between R1 & 10.2.2.2; R1 & 10.3.3.3 are not good (they are in “Active” and “Idle” state).

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