Reference Guide

resetting the TCP connection. After configuring soft-reconfiguration, use clear ip bgp to make the neighbor use soft
reconfiguration.
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 replays and updates are re-evaluated. With this command, the replay and update process triggers
only if a route-refresh request is not negotiated with the peer. If the request is negotiated after using the clear ip bgp
soft in command, BGP sends a route-refresh request to the neighbor and receives all the peer’s updates.
To use soft reconfiguration, or soft reset without preconfiguration, both BGP peers must support the soft route refresh
capability. The soft route refresh advertises 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 Received route refresh capability from peer message displays.
1. Enable soft-reconfiguration for the BGP neighbor and BGP template in ROUTER-BGP mode. BGP stores all the updates that
the neighbor receives but does not reset the peer-session. Entering this command starts the storage of updates, which is
required to do inbound soft reconfiguration.
neighbor {ip-address} soft-reconfiguration inbound
2. Enter Address Family mode in ROUTER-NEIGHBOR mode.
address-family {[ipv4 | ipv6] [unicast]}
3. Configure soft-configuration for the neighbors belonging to the template.
soft-reconfiguration inbound
4. Clear all information or only specific details in EXEC mode.
clear ip bgp {neighbor-address | * } [soft in]
● * — Clears all peers.
● neighbor-address — Clears the neighbor with this IP address.
Soft-reconfiguration of IPv4 neighbor
OS10(conf-router-neighbor)# address-family ipv4 unicast
OS10(conf-router-bgp-neighbor-af)# soft-reconfiguration inbound
Soft-reconfiguration of IPv6 neighbor
OS10(conf-router-neighbor)# address-family ipv6 unicast
OS10(conf-router-bgp-neighbor-af)# soft-reconfiguration inbound
BGP commands
activate
Enables the neighbor or peer group to be the current address-family identifier (AFI).
Syntax
activate
Parameters None
Default Not configured
Command Mode ROUTER-BGP-NEIGHBOR-AF
Usage
Information
This command is used for exchanging IPv4 or IPv6 address family information with IPv4 or IPv6 neighbor.
IPv4 unicast Address family is enabled by default. To activate IPv6 address family for IPv6 neighbor, use
the activate command. To de-activate IPv4 address family for IPv6 neighbor, use the no activate
command.
Example
OS10(conf-router-neighbor)# address-family ipv4 unicast
OS10(conf-router-bgp-neighbor-af)# activate
306 Layer 3