ZyXEL Communications MGS3520 Series, Руководство пользователя

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Chapter 24 VLAN Stacking
MGS3520 Series User’s Guide
194
Figure 109
VLAN Stacking Example
24.2 VLAN Stacking Port Roles
Each port can have three VLAN stacking “roles”, Normal , Access Port and Tunnel Port (the latter
is for Gigabit ports only).
• Select Normal for “regular” (non-VLAN stacking) IEEE 802.1Q frame switching.
• Select Access Port 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 Port .
• Select Tunnel Port (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
Port .
24.3 VLAN Tag Format
A VLAN tag (service provider VLAN stacking or customer IEEE 802.1Q) consists of the following
three fields.
Table 76
VLAN Tag Format
Type Priority VID