Resetting a BGP Connection

When a routing policy changes, use the clear ip bgp and clear bgp ipv6 commands to clear the current BGP session and implement the new policy.

Clearing a BGP session can create a major disruption in the network operation; this is known as a hard clear. For this reason, you can use the soft in and soft out options of the command (a soft clear) to activate policies without disrupting the BGP session.

The soft in option reapplies inbound policy to received routes; the soft out option resends routes to a neighbor after reapplying outbound policy. The soft in prefix-list option causes BGP to push any prefix list outbound route filters (ORFs) to the peer and then reapply inbound policy to received routes.

Note: Resetting the BGP connection is slightly different when you change outbound policies for peer groups for which you have enabled Adj-RIBs-Out. You cannot merely perform a hard clear or outbound soft clear for individual peer group members because that causes BGP to resend only the contents of the Adj-RIBs-Out table. If you change the outbound policy for such a peer group and want to fill the Adj-RIBs-Out table for that peer group with the results of the new policy, you must use the clear ip bgp peer-group command to perform a hard clear or outbound soft clear of the peer group.

clear bgp ipv6

clear ip bgp

• Use to clear the current BGP connection or to activate a new policy without clearing the BGP session.
• You can specify the IP address of a BGP neighbor, the name of a BGP peer group, or an address family to be cleared.
• Use the asterisk (*) to clear all BGP connections.
• If you do not use the soft in or soft out options, the clear is known as a hard clear and clears the current BGP connection.
• Use the soft in option to reapply inbound policy to all received routes without clearing the BGP session.
• Use the soft in prefix-filter option to push an ORF to the peer and reapply inbound policy to all received routes without clearing the BGP session.
• Use the soft out option to reapply outbound policy and resend routes without clearing the BGP session.
• This command takes effect immediately.
• There is no no version.
• See clear bgp ipv6.
• See clear ip bgp.

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