Brocade Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide (Supporting R05.6.00) - Manual (Page 589)

Multi-Service IronWare Multiprotocol Label Switch (MPLS) Configuration Guide 565
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Local VLL
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Configuring a single-tagged endpoint
Tagged ports are configured under a VLAN ID. This ID is only meaningful for the tagged port.
For tagged ports, a vlan-id, port pair constitutes a VLL endpoint. When a port is currently a member
of a non-default VLAN as an untagged port, it must be returned to the default VLAN before it can be
assigned to a VLL as a tagged port.
To configure tagged port 1/2 with VLAN 200 into Local VLL instance “test1” use the following
commands.
Brocade(config)# router mpls
Brocade(config-mpls)# vll-local test1
Brocade(config-mpls-vll-lo-test1)# vlan 200
Brocade(config-mpls-vll-lo-test1-vlan)# tagged ethernet 1/2
Syntax: vlan VLAN-ID
The range for VLAN ID is 1 – 4094. (This parameter range excludes the default VLAN ID.)
Syntax: [no] tagged ethernet slot/port
Configuring a dual-tagged endpoint
Dual-tagged ports are configured under a VLAN ID. The main difference between single and dual
tagged configuration is that in the dual-tagged configuration, a parameter for inner-vlan is
configured.
Considerations when configuring the Local VLL with dual tagged endpoints
Before configuring a Local VLL to operate with Dual Tagged Endpoints, the user must consider the
following:
• The System Max value for IFL CAM must be changed from its default value of zero (which does
not support this feature) to a higher value.
• Only one dual-tag endpoint can exist on the same port per instance.
• The inner VLAN of the dual-tag endpoint cannot be configured dynamically. In other words, an
existing single-tag VLL endpoint cannot be changed to a dual tag VLL endpoint on the fly. The
user must delete the single-tag VLL endpoint before configuring a dual-tag endpoint.
• A dual tag VLL endpoint neither recognizes nor forwards packets that have a single tag.
However, a single-tag endpoint can recognize and forward dual tag packets because the
endpoint treats the second tag as data.
• When only the outer VLAN is specified for a given endpoint, the VLAN is called a less-specific
VLAN. Similarly, when both the outer and inner VLANs are specified, the VLAN is called a
more-specific VLAN (in relation to the outer VLAN).
• When a less-specific VLAN is already configured on a given port, then a more-specific VLAN
with the same outer VLAN tag can be configured on that port. In the following example, a
less-specific, tagged endpoint has been configured with VLAN 100 on port e 2/1, and a
more-specific endpoint with outer-VLAN value of “100” and an inner-VLAN value of “200” is
configured on port e 2/1.