Configuring A Destination Port As An Unconditional Trunk; Configuring Destination Trunk Port Vlan Filtering - Cisco WS-SUP32-GE-3B - Supervisor Engine 32 Software Configuration Manual

Chapter 48 Configuring Local SPAN, RSPAN, and ERSPAN

Configuring a Destination Port as an Unconditional Trunk

To tag the monitored traffic as it leaves a destination port, configure the destination port as a trunk.
To configure the destination port as a trunk, perform this task:
Command
Step 1
Router# configure terminal
Step 2
Router(config)# interface type
Step 3
Router(config-if)# switchport
Step 4
Router(config-if)# switchport trunk encapsulation
{isl | dot1q}
Step 5
Router(config-if)# switchport mode trunk
Step 6
Router(config-if)# switchport nonegotiate
1. type = ethernet, fastethernet, gigabitethernet, or tengigabitethernet
This example shows how to configure a port as an unconditional IEEE 802.1Q trunk:
Router(config)# interface fastethernet 5/12
Router(config-if)# switchport
Router(config-if)# switchport trunk encapsulation dot1q
Router(config-if)# switchport mode trunk
Router(config-if)# switchport nonegotiate

Configuring Destination Trunk Port VLAN Filtering

In addition to filtering VLANs on a trunk, you can also apply the allowed VLAN list to access ports.
Note
When a destination port is a trunk, you can use the list of VLANs allowed on the trunk to filter the traffic
transmitted from the destination port. (CSCeb01318)
Destination trunk port VLAN filtering removes the restriction that all destination ports receive all the
traffic from all the sources. Destination trunk port VLAN filtering allows you to select, on a per-VLAN
basis, the traffic that is transmitted from each destination trunk port to the network analyzer.
To configure destination trunk port VLAN filtering on a destination trunk port, perform this task:
Command
Step 1
Router# configure terminal
Step 2
Router(config)# interface type
Step 3
Router(config-if)# switchport trunk allowed vlan
{add | except | none | remove} vlan
[,vlan[,vlan[,...]]
1. type = ethernet, fastethernet, gigabitethernet, or tengigabitethernet
OL-11439-03
1
slot/port
1
slot/port
Catalyst Supervisor Engine 32 PISA Cisco IOS Software Configuration Guide, Release 12.2ZY
Configuring Local SPAN, RSPAN, and ERSPAN
Purpose
Enters global configuration mode.
Selects the LAN port to configure.
Configures the LAN port for Layer 2 switching (required
only if the LAN port is not already configured for Layer 2
switching).
Configures the encapsulation, which configures the
Layer 2 switching port as either an ISL or 802.1Q trunk.
Configures the port to trunk unconditionally.
Configures the trunk not to use DTP.
Purpose
Enters global configuration mode.
Selects the destination trunk port to configure.
Configures the list of VLANs allowed on the trunk.
48-21