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Figure 296 VLAN Stacking Example
59.2 VLAN Stacking Port Roles
Each port can have three VLAN stacking "roles", Normal, Access, and Tunnel (the latter is for Gigabit
ports only).
• Select Normal for "regular" (non-VLAN stacking) IEEE 802.1Q frame switching.
• Select Access for ingress ports on the service provider's edge devices (1 and 2 in the VLAN stacking
example figure). The incoming frame is treated as "untagged", so a second VLAN tag (outer VLAN
tag) can be added.
Note: Static VLAN Tx Tagging MUST be disabled on a port where you choose Normal or
Access.
• Select Tunnel (available for Gigabit ports only) for egress ports at the edge of the service provider's
network. All VLANs belonging to a customer can be aggregated into a single service provider's VLAN
(using the outer VLAN tag defined by the Service Provider's (SP) VLAN ID (VID)).
Note: Static VLAN Tx Tagging MUST be enabled on a port where you choose Tunnel.
59.3 VLAN Tag Format
A VLAN tag (service provider VLAN stacking or customer IEEE 802.1Q) consists of the following three
fields.
Table 221 VLAN Tag Format
Type
Chapter 59 VLAN Stacking
Priority
VID
XMG1930 Series User's Guide
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