[vc_row][vc_column][vc_column_text]Make use of the following commands to monitor BGP:

• show bgp ipv4 unicast summary – shows the status of your IPv4 BGP sessions.
• show bgp ipv6 unicast summary – shows the status of your IPv6 Make use of the following commands to monitor BGP: show bgp ipv4 unicast summary – shows the status of your IPv4 BGP sessions.
• show bgp ipv6 unicast summary – shows the status of your IPv6 BGP sessions. All remote IP addresses for BGP sessions are then listed with as the last item on the line the session state or a number of prefixes received over that session for the IP version in question if the session is up. Note that state “active” means that the connection is down. (We’ll leave out the IPv6 versions from now on.)
• show bgp ipv4 unicast – shows the entire BGP table.
• show bgp ipv4 unicast <prefix> – shows the information for a specific prefix.
• show bgp ipv4 unicast regexp <AS path regular expression> – shows all paths in the BGP table that match the AS path regular expression. For instance, show bgp ipv4 unicast regexp _174_ shows all AS paths with the Cogent Communications AS number in them.
• show bgp ipv4 unicast neighbors <address>– shows detailed information about a single BGP neighbor.
• show bgp ipv4 unicast neighbors <address> routes – shows all the prefixes received from the neighbor in question that are currently in the BGP table.
• show bgp ipv4 unicast neighbors <address> advertised-routes – shows all the prefixes advertised to the neighbor in question.

It is also possible to monitor the propagation of BGP announcements and often also perform traceroutes using numerous “looking glasses” such as lg.he.net. Search “BGP looking glass” to find many more.

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