Configuring BGP4
•If you close a neighbor session, the routing switch and the neighbor clear all the routes they learned from each other. When the routing switch and neighbor establish a new BGP4 session, they exchange route tables again. Use this method if you want the routing switch to relearn routes from the neighbor and resend its own route table to the neighbor.
•If you use the soft-outbound option, the routing switch compiles a list of all the routes it would normally send to the neighbor at the beginning of a session. However, before sending the updates, the HP routing switch also applies the filters and route maps you have configured to the list of routes. If the filters or route maps result in changes to the list of routes, the routing switch sends updates to advertise, change, or even withdraw routes on the neighbor as needed. This ensures that the neighbor receives only the routes you want it to contain. Even if the neighbor already contains a route learned from the routing switch that you later decided to filter out, using the soft-outbound option removes that route from the neighbor.
You can specify a single neighbor or a peer group.
USING THE CLI
To close a neighbor session and thus flush all the routes exchanged by the routing switch and the neighbor, enter the following command:
HP9300# clear ip bgp neighbor all
Syntax: clear ip bgp neighbor all <ip-addr> <peer-group-name> <as-num> [soft-outbound soft [in out]]
The all <ip-addr> <peer-group-name> <as-num> specifies the neighbor. The <ip-addr> parameter specifies a neighbor by its IP interface with the routing switch. The <peer-group-name> specifies all neighbors in a specific peer group. The <as-num> parameter specifies all neighbors within the specified AS. The all parameter specifies all neighbors.
To resend routes to a neighbor without closing the neighbor session, enter a command such as the following:
HP9300# clear ip bgp neighbor 10.0.0.1 soft out
USING THE WEB MANAGEMENT INTERFACE
To resend route information to a neighbor, use the following procedure:
1.Log on to the device using a valid user name and password for read-write access. The System configuration panel is displayed.
2.Click on the plus sign next to Command in the tree view to expand the list of command options.
3.Click on the Clear link to display the Clear panel.
4.Select BGP Neighbor Soft-Outbound.
5.Use the default value All to resend the BGP4 route table to all neighbors or select a neighbor from the field’s pulldown menu.
6.Click the Apply button to implement the change.
Removing Route Flap Dampening
You can un-suppress routes by removing route flap dampening from the routes. The routing switch allows you to un-suppress all routes at once or un-suppress individual routes.
To un-suppress routes, use either of the following methods.
USING THE CLI
To un-suppress all the suppressed routes, enter the following command at the Privileged EXEC level of the CLI:
HP9300# clear ip bgp damping
Syntax: clear ip bgp damping [<ip-addr> <ip-mask>]
The <ip-addr> parameter specifies a particular network.
The <ip-mask> parameter specifies the network’s mask.
