Reference Guide

1458 | VLAN Stacking
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Usage
Information
Prior to using this command, you must execute the switchport command to place the interface
in Layer 2 mode.
To remove the trunk port designation, the port must first be removed (using the
no member
interface command) from all Stackable VLAN-enabled VLANs.
Starting with FTOS 7.7.1.0 for E-Series, the VLAN-Stack trunk port can transparently tunnel,
in a service provider environment, customer-originated xSTP control protocol PDUs. Refer to
Chapter 47, Service Provider Bridging.
Starting with FTOS 7.8.1.0 for C-Series and S-Series (FTOS 7.7.1 for E-Series), a
VLAN-Stack trunk port is also allowed to be configured as a tagged port and as an untagged
port for single-tagged VLANs. When the VLAN-Stack trunk port is also a member of an
untagged VLAN, the port should be in hybrid mode. Refer to portmode hybrid.
In Example 1 below a VLAN-Stack trunk port is configured and then also made part of a
single-tagged VLAN.
In Example 2 below, the Tag Protocol Identifier (TPID) is set to 8848. The “Gi 3/10” port is
configured to act as a VLAN-Stack access port, while the “TenGi 8/0” port will act as a
VLAN-Stack trunk port, switching Stackable VLAN traffic for VLAN 10, while also
switching untagged traffic for VLAN 30 and tagged traffic for VLAN 40. (To allow VLAN
30 traffic, the native VLAN feature is required, by executing the
portmode hybrid command.
Refer to portmode hybrid in Interfaces.
Example
(Tagged VLAN)
FTOS(conf-if-gi-0/42)#switchport
FTOS(conf-if-gi-0/42)#vlan-stack trunk
FTOS(conf-if-gi-0/42)#show config
!
interface GigabitEthernet 0/42
no ip address
switchport
vlan-stack trunk
no shutdown
FTOS(conf-if-gi-0/42)#interface vlan 100
FTOS(conf-if-vl-100)#vlan-stack compatible
FTOS(conf-if-vl-100-stack)#member gigabitethernet 0/42
FTOS(conf-if-vl-100-stack)#show config
!
interface Vlan 100
no ip address
vlan-stack compatible
member GigabitEthernet 0/42
shutdown
FTOS(conf-if-vl-100-stack)#interface vlan 20
FTOS(conf-if-vl-20)#tagged gigabitethernet 0/42
FTOS(conf-if-vl-20)#show config
Version 7.7.1.0 Functionality augmented for E-Series to enable multi-purpose use of the port.
Refer to Usage Information, below.
Version 7.6.1.0 Introduced for C-Series and S-Series
E-Series original Command