L2Protocol-Tunnel Shutdown-Threshold - Cisco Catalyst 4500 Series Command Reference Manual

Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches

l2protocol-tunnel shutdown-threshold

To configure the protocol tunneling encapsulation rate, use the I2protocol-tunnel shutdown-threshold
command. You can set the encapsulation rate for the Cisco Discovery Protocol (CDP), Spanning Tree
Protocol (STP), or VLAN Trunking Protocol (VTP) packets. To disable the encapsulation rate on the
interface, use the no form of this command.
Syntax Description
cdp
stp
vtp
value
Defaults The default is no shutdown threshold for the number of Layer 2 protocol packets.
Command Modes
Interface configuration mode
Command History Release
12.2(18)EW
Usage Guidelines The l2-protocol-tunnel shutdown-threshold command controls the number of protocol packets per
second that are received on an interface before it shuts down. When no protocol option is specified with
the keyword, the threshold is applied to each of the tunneled Layer 2 protocol types. If you also set a
drop threshold on the interface, the shutdown-threshold value must be greater than or equal to the
drop-threshold value.
When the shutdown threshold is reached, the interface is error disabled. If you enable error recovery by
entering the errdisable recovery cause l2ptguard command, the interface is brought out of the
error-disabled state and allowed to retry the operation again when all the causes have timed out. If the
error recovery feature generation is not enabled for l2ptguard, the interface stays in the error-disabled
state until you enter the shutdown and no shutdown commands.
Examples This example shows how to configure the maximum rate:
Switch(config-if)# l2protocol-tunnel shutdown-threshold cdp 50
Switch(config-if)#
Related Commands
OL-25342 -01
l2protocol-tunnel shutdown-threshold [cdp | stp | vtp] value
no l2protocol-tunnel shutdown-threshold [cdp | stp | vtp] value
(Optional) Specifies a shutdown threshold for CDP.
(Optional) Specifies a shutdown threshold for STP.
(Optional) Specifies a shutdown threshold for VTP.
Specifies a threshold in packets per second to be received for encapsulation before the
interface shuts down. The range is 1 to 4096. The default is no threshold.
Modification
Support for this command was introduced on the Catalyst 4500 series switch.
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.3.0SG and IOS 15.1(1)SG)
l2protocol-tunnel shutdown-threshold
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