Specifications

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Catalyst 4500 Series Switch Cisco IOS Command Reference—Release IOS XE 3.3.0XO(15.1(1)XO)
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Chapter 2 Cisco IOS Commands for the Catalyst 4500 Series Switches
access-list hardware capture mode
access-list har dware capture mode
To select the mode o f captur ing cont rol packets , use th e access-list hardware capture mode command.
access-list hardware capture mode {global | vlan}
Syntax Description
Defaults T he control packets are glob ally captured.
Command Modes Global c onfiguratio n mode
Usage Guidelines Before configuring the capture mode, it is best to examine and modify your configuration to globally
disable features such as DHC P snooping or IGMP snooping, and instead enable the m on specific
VLANs.
When changing to path manage d mode, be aware that control t raffic may be bridged in hardware or
dropped initially until the per-vlan CAM entries are programmed in hardware.
You must ensure that any a ccess contro l configura tion on a me mber port or VLAN do es not deny or drop
the control packets from being fo rwarded to the CPU for the feature s which are enabled on the VLA N.
If control packets are not permitted then the specific feature does not function.
Examples This exampl e shows how to configure the swi tch to capture control packe ts on VLANs that are
configured to enable capturing control packets:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
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. End with CNTL/Z.
Switch(config)# access-list hardware capture mode global
Switch(config)# end
Switch#
This example shows another way to configure the switch to capture control packets globally across all
VLANs:
Switch# configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch(config)# no access-list hardware capture mode vlan
Switch(config)# end
Switch#
global Specifies the capture of control packets globally on all VLANs.
vlan Specifies the capture of control packets on a specific VLAN.