Access-List Hardware Capture Mode - Cisco Catalyst 4500 Series Command Reference Manual

access-list hardware capture mode

access-list hardware capture mode
To select the mode of capturing control packets, use the access-list hardware capture mode command.
Syntax Description
global
vlan
Defaults The control packets are globally captured.
Command Modes Global configuration mode
Command History Release
12.2(40)SG
Usage Guidelines This command is not supported on the Supervisor Engine 6-E and the Catalyst 4900M chassis.
Before configuring the capture mode, it is best to examine and modify your configuration to globally
disable features such as DHCP snooping or IGMP snooping, and instead enable them on specific
VLANs.
When changing to path managed mode, be aware that control traffic may be bridged in hardware or
dropped initially until the per-vlan CAM entries are programmed in hardware.
You must ensure that any access control configuration on a member port or VLAN does not deny or drop
the control packets from being forwarded to the CPU for the features which are enabled on the VLAN.
If control packets are not permitted then the specific feature does not function.
Examples
This example shows how to configure the switch to capture control packets on VLANs that are
configured to enable capturing control packets:
Switch# configure terminal
Enter configuration commands, one per line.
Switch(config)# access-list hardware capture mode vlan
Switch(config)# end
Switch#
This example shows how to configure the switch to capture control packets globally across all VLANs
(using a static ACL):
Switch# configure terminal
Enter configuration commands, one per line.
Switch(config)# access-list hardware capture mode global
Switch(config)# end
Switch#
Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.4.0SG and IOS 15.1(2)SG)
2-8
access-list hardware capture mode {global | vlan}
Specifies the capture of control packets globally on all VLANs.
Specifies the capture of control packets on a specific VLAN.
Modification
Support for this command was introduced on the Catalyst 4500 series switch.
Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
End with CNTL/Z.
End with CNTL/Z.
OL-27596 -01