Configuring Support For 802.1Q Tunneling; Configuring The Switch To Support 802.1Q Tunneling - Cisco WS-X6066-SLB-APC - Content Switching Module Software Manual

Chapter 7 Configuring IEEE 802.1Q Tunneling
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To configure an EtherChannel as an asymmetrical link, all ports in the EtherChannel must have the
Note
same tunneling configuration. Since the Layer 3 packet within the Layer 2 frame cannot be identified,
configure the EtherChannel to use MAC-address-based frame distribution.
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Configuring Support for 802.1Q Tunneling

These sections describe 802.1Q tunneling configuration:
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Ensure that only the appropriate tunnel ports are in any VLAN used for tunneling and that one VLAN
Caution
is used for each tunnel. Incorrect assignment of tunnel ports to VLANs can forward traffic
inappropriately.

Configuring the Switch to Support 802.1Q Tunneling

The set dot1q-all-tagged enable command is a global command that configures a switch to forward all
frames from 802.1Q trunks with 802.1Q tagging, including traffic in the native VLAN, and admit only
802.1Q tagged frames on 802.1Q trunks, dropping any untagged traffic, including untagged traffic in the
native VLAN. You can enter this command on any switch that needs to support 802.1Q tunneling with
802.1Q trunks.
To configure the switch to support 802.1Q tunneling, perform this task in privileged mode:
Task
Step 1 Configure tunneling support on the switch.
Step 2
Verify the configuration.
78-13315-02
VLAN Trunk Protocol (VTP) does not work between the following devices:
Devices connected by an asymmetrical link
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Devices communicating through a tunnel
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Generic Attribute Registration Protocol (GARP) VLAN Registration Protocol (GVRP) works
between devices communicating through a tunnel, but does not work between devices connected by
an asymmetrical link.
An interconnected network cannot have redundant paths to two different edge switches in an ISP.
An interconnected network may have redundant paths to the same edge switch in an ISP, but the
customer network must use Per VLAN Spanning Tree + (PVST+) and cannot be configured for
Multi-Instance Spanning Tree Protocol (MISTP). The ISP infrastructure must use either PVST+ or
MISTP-PVST+.
Configuring the Switch to Support 802.1Q Tunneling, page 7-3
Configuring 802.1Q Tunnel Ports, page 7-4
Clearing 802.1Q Tunnel Ports, page 7-4
Removing Global Support for 802.1Q Tunneling, page 7-4
Command
set dot1q-all-tagged enable [all]
show dot1q-all-tagged
Catalyst 6000 Family Software Configuration Guide—Releases 6.3 and 6.4
Configuring Support for 802.1Q Tunneling
7-3