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Catalyst4500 Series SwitchCiscoIOS Command Reference—Release 12.2(18)EW
78-16201-01
Chapter2Cisco IOS Commands for the Catalyst 4500 Series Switches
l2protocol-tunnel shutdown-threshold
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 Cisco Discovery Protocol (CDP), Spanning Tree
Protocol (STP), or VLAN Trunking Protocol (VTP) packets. Use the no form of this command to disable
the encapsulation rate on the interface.
l2protocol-tunnel shutdown-threshold [cdp | stp | vtp] value
no l2protocol-tunnel shutdown-threshold [cdp | stp | vtp] value
Syntax Description
Defaults The default is no shutdown threshold for the number of Layer 2 protocol packets.
Command Modes Interface configuration
Command History
Usage Guidelines Enter the shutdown-threshold keyword to control 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 l2protocol-tunnel
l2protocol-tunnel cos
l2protocol-tunnel shutdown-threshold
cdp (Optional) Specifies a shutdown threshold for CDP.
stp (Optional) Specifies a shutdown threshold for STP.
vtp (Optional) Specifies a shutdown threshold for VTP.
value Specifies a threshold in packets per second to be received for encapsulation before the
interface shuts down. The range is 1 to4096. The default is no threshold.
Release Modification
12.2(18)EW Support for this command was introduced on the Catalyst 4500 series switch.
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