Removing Route Flap Dampening; Clearing Diagnostic Buffers - Foundry Networks FESX Manual

Syntax: clear ip bgp flap-statistics [regular-expression <regular-expression> | <address> <mask> | neighbor <ip-
addr>]
The parameters are the same as those for the show ip bgp flap-statistics command (except the longer-prefixes
option is not supported). See "Displaying Route Flap Dampening Statistics" on page 21-63.
NOTE: The clear ip bgp damping command not only clears statistics but also un-suppresses the routes. See
"Displaying Route Flap Dampening Statistics" on page 21-63.

Removing Route Flap Dampening

You can un-suppress routes by removing route flap dampening from the routes. The Layer 3 Switch allows you to
un-suppress all routes at once or un-suppress individual routes.
To un-suppress all the suppressed routes, enter the following command at the Privileged EXEC level of the CLI:
FESX424 Router# 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.
To un-suppress a specific route, enter a command such as the following:
FESX424 Router# clear ip bgp damping 209.157.22.0 255.255.255.0
This command un-suppresses only the route(s) for network 209.157.22.0/24.

Clearing Diagnostic Buffers

The Layer 3 Switch stores the following BGP4 diagnostic information in buffers:
• The first 400 bytes of the last packet that contained an error
• The last NOTIFICATION message either sent or received by the Layer 3 Switch
To display these buffers, use options with the show ip bgp neighbors command. See "Displaying BGP4
Neighbor Information" on page 21-73.
This information can be useful if you are working with Foundry Technical Support to resolve a problem. The
buffers do not identify the system time when the data was written to the buffer. If you want to ensure that
diagnostic data in a buffer is recent, you can clear the buffers. You can clear the buffers for a specific neighbor or
for all neighbors.
If you clear the buffer containing the first 400 bytes of the last packet that contained errors, all the bytes are
changed to zeros. The Last Connection Reset Reason field of the BGP neighbor table also is cleared.
If you clear the buffer containing the last NOTIFICATION message sent or received, the buffer contains no data.
You can clear the buffers for all neighbors, for an individual neighbor, or for all the neighbors within a specific peer
group.
To clear these buffers for neighbor 10.0.0.1, enter the following commands:
FESX424 Router# clear ip bgp neighbor 10.0.0.1 last-packet-with-error
FESX424 Router# clear ip bgp neighbor 10.0.0.1 notification-errors
Syntax: clear ip bgp neighbor all | <ip-addr> | <peer-group-name> | <as-num>
last-packet-with-error | notification-errors
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 Layer 3 Switch. The <peer-group-name> specifies all neighbors in a specific
December 2005 © Foundry Networks, Inc.
Configuring BGP4
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