Chapter 24 VLAN Stacking
MES3500 Series User’s Guide
183
Figure 100
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 66
VLAN Tag Format
Type
Priority
VID
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