command, the replay and update process is triggered only if a route-refresh request is not negotiated withthe peer. If the request is indeed negotiated (after execution of clear ip bgp soft in), BGP sends aroute-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 softroute 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. Ifa router supports the route refresh capability, the following message displays: Received route refreshcapability from peer.If you specify a BGP peer group by using the peer-group-name argument, all members of the peer groupinherit the characteristic configured with this command.• Clear all information or only specific details.EXEC Privilege modeclear 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 modeneighbor {ip-address | peer-group-name} soft-reconfiguration inboundBGP 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 softreconfiguration. Outbound BGP soft reconfiguration does not require inbound soft reconfiguration to beenabled.Example of Soft-Reconfigration of a BGP NeighborThe example enables inbound soft reconfiguration for the neighbor 10.108.1.1. All updates received from thisneighbor are stored unmodified, regardless of the inbound policy. When inbound soft reconfiguration is donelater, the stored information is used to generate a new set of inbound updates.Dell>router bgp 100neighbor 10.108.1.1 remote-as 200neighbor 10.108.1.1 soft-reconfiguration inboundBorder Gateway Protocol IPv4 (BGPv4) 244
