Cisco Catalyst 4500 Series Configuration Manual page 46

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
Command Default 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 Supervisor Engine 6-E, Supervisor Engine 6L-E, Catalyst 4900M,
Catalyst 4948E, and Catalyst 4948E-F.
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
The following 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#
The following 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 XE 3.9.xE and 15.2(5)Ex
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
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.
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