Configuring BGP
Configuring Basic BGP Features
IPC-300
Cisco IOS IP Configuration Guide
Resetting a Router Using BGP Outbound Soft Reset
Outbound soft resets do not require any preconfiguration. Using the soft keyword specifies that a soft
reset be performed. To perform an outbound soft reset, use the following command in EXEC mode:
Configuring BGP Soft Reset Using Stored Routing Policy Information
If all of the BGP routers in the connection do not support the route refresh capability, use the soft reset
method that generates a new set of inbound routing table updates from information previously stored. To
initiate storage of inbound routing table updates, you must first preconfigure the router using the
neighbor soft-reconfiguration router configuration command. The clear ip bgp EXEC command
initiates the soft reset, which generates a new set of inbound routing table updates using the stored
information.
Remember that the memory requirements for storing the inbound update information can become quite
large.To configure BGP soft reset using stored routing policy information, use the following commands
beginning in router configuration mode:
See the “BGP Path Filtering by Neighbor Examples” section at the end of this chapter for an example of
BGP path filtering by neighbor.
Command Purpose
Router# clear ip bgp {* |
neighbor-address | peer-group-name}
soft out
Performs a soft reset on the connection specified in the command.
The neighbor-address argument specifies the connection to be reset. Use the
* keyword to specify that all connections be reset.
Command Purpose
Step1 Router(config-router)# neighbor {ip-address |
peer-group-name} soft-reconfiguration inbound
Resets the BGP session and initiates storage of
inbound routing table updates from the specified
neighbor or peer group. From that point forward, a
copy of the BGP routing table for the specified
neighbor or peer group is maintained on the router.
The Cisco implementation of BGP supports BGP
Versions 2, 3, and 4. If the neighbor does not accept
default Version 4, dynamic version negotiation is
implemented to negotiate down to Version 2.
If you specify a BGP peer group by using the
peer-group-name argument, all members of the peer
group will inherit the characteristic configured with
this command.
Step2 Router# clear ip bgp {* | neighbor-address |
peer-group–name} soft in
Performs a soft reset on the connection specified in
the command, using the stored routing table
information for that connection.