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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Enabling BGP Neighbor Soft-Reconfiguration

BGP soft-reconfiguration allows for faster and easier route changing.

Changing routing policies typically requires a reset of BGP sessions (the TCP connection) for the policies to take effect. Such resets cause undue interruption to traffic due to hard reset of the BGP cache and the time it takes to re-establish the session. BGP soft reconfig allows for policies to be applied to a session without clearing the BGP Session. Soft-reconfig can be done on a per-neighbor basis and can either be inbound or outbound.

BGP soft-reconfiguration clears the policies without resetting the TCP connection.

To reset a BGP connection using BGP soft reconfiguration, use the clear ip bgp command in EXEC Privilege mode at the system prompt.

When you enable soft-reconfiguration for a neighbor and you execute the clear ip bgp soft in command, the update database stored in the router is replayed and updates are reevaluated. With this command, the replay and update process is triggered only if a route-refresh request is not negotiated with the peer. If the request is indeed negotiated (after execution of clear ip bgp soft in), BGP sends a route-refresh request to the neighbor and receives all of the peer’s updates.

To use soft reconfiguration (or soft reset) without preconfiguration, both BGP peers must support the soft route refresh capability, which is advertised in the open message sent when the peers establish a TCP session.

To determine whether a BGP router supports this capability, use the show ip bgp neighbors command. If a router supports the route refresh capability, the following message displays: Received route refresh capability from peer.

If you specify a BGP peer group by using the peer-group-name argument, all members of the peer group inherit the characteristic configured with this command.

  • Clear all information or only specific details. EXEC Privilege mode clear ip bgp {* | neighbor-address | AS Numbers | ipv4 | peer-group-name} [soft [in | out]]
    • *: Clears all peers.
    • neighbor-address: Clears the neighbor with this IP address.
    • AS Numbers: Peers’ AS numbers to be cleared.
    • ipv4: Clears information for the IPv4 address family.
    • peer-group-name: Clears all members of the specified peer group.
  • Enable soft-reconfiguration for the BGP neighbor specified. CONFIG-ROUTER-BGP mode neighbor { ip-address | peer-group-name} soft-reconfiguration inbound BGP stores all the updates received by the neighbor but does not reset the peer-session. Entering this command starts the storage of updates, which is required to do inbound soft reconfiguration. Outbound BGP soft reconfiguration does not require inbound soft reconfiguration to be enabled.

Example of Soft-Reconfigration of a BGP Neighbor

The example enables inbound soft reconfiguration for the neighbor 10.108.1.1. All updates received from this neighbor are stored unmodified, regardless of the inbound policy. When inbound soft reconfiguration is done later, the stored information is used to generate a new set of inbound updates. 
Dell>router bgp 100
                                 neighbor 10.108.1.1 remote-as 200
                                 neighbor 10.108.1.1 soft-reconfiguration inbound

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