Users Guide

VLANs 789
Beginning in global configuration mode, perform the following steps to
configure the SP port using the VMAN (0x88A8) outer tag. In this
configuration, packets received on CE ports will have the VMAN tag pushed
onto the frame before being transmitted out the SP interface. Packets
received on the SP interface will have the VMAN tag stripped before
forwarding to the CE interface.
spanning-tree guard root (Optional) Disable the ability of the CE port to become
spanning tree root.
spanning-tree tcnguard (Optional) Ignore topology changes received from CE
ports.
exit Exit to global configuration mode
CTRL + Z Exit to Privileged Exec mode.
show dot1q-tunnel Display all interfaces enabled for Double VLAN Tunneling
show dot1q-tunnel
interface {interface-id|
all}
Display detailed information about Double VLAN
Tunneling for the specified interface or all interfaces.
show switchport
ethertype [interface
interface-id | all]
Display the configured EtherType for each interface.
Command Purpose
switchport dot1q
ethertype {vman |
custom 0-65535}
[primary-tpid]
Configure the EtherType to use for an SP interface using
one of the previously configured EtherTypes.
• vman — Configures the EtherType as 0x88A8.
• custom — Configure a custom EtherType for the
DVLAN tunnel. The value must be 0–65535.
• primary-tpid — Configure the primary (outer) TPID. Up
to four unique outer VLAN tag TPIDs may be
configured.
interface interface-id Enter interface configuration mode for the SP uplink port.
switchport mode trunk Configure the interface in trunk mode.
Command Purpose