Microsens MS453490M Management Guide - Manual (Page 171)

C HAPTER 6 | VLAN Configuration
IEEE 802.1Q Tunneling
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7. The switch sends the packet to the proper egress port.
8. If the egress port is an untagged member of the SPVLAN, the outer tag
will be stripped. If it is a tagged member, the outgoing packet will have
two tags.
Configuration Limitations for QinQ
◆ The native VLAN of uplink ports should not be used as the SPVLAN. If
the SPVLAN is the uplink port's native VLAN, the uplink port must be an
untagged member of the SPVLAN. Then the outer SPVLAN tag will be
stripped when the packets are sent out. Another reason is that it
causes non-customer packets to be forwarded to the SPVLAN.
◆ Static trunk port groups are compatible with QinQ tunnel ports as long
as the QinQ configuration is consistent within a trunk port group.
◆ The native VLAN (VLAN 1) is not normally added to transmitted frames.
Avoid using VLAN 1 as an SPVLAN tag for customer traffic to reduce the
risk of misconfiguration. Instead, use VLAN 1 as a management VLAN
instead of a data VLAN in the service provider network.
◆ There are some inherent incompatibilities between Layer 2 and Layer 3
switching:
■
Tunnel ports do not support IP Access Control Lists.
■
Layer 3 Quality of Service (QoS) and other QoS features containing
Layer 3 information are not supported on tunnel ports.
■
Spanning tree bridge protocol data unit (BPDU) filtering is
automatically disabled on a tunnel port.
General Configuration Guidelines for QinQ
1. Enable Tunnel Status, and set the Tag Protocol Identifier (TPID) value of
the tunnel access port (in the Ethernet Type field. This step is required
if the attached client is using a nonstandard 2-byte ethertype to
identify 802.1Q tagged frames. The default ethertype value is 0x8100.
(See "Enabling QinQ Tunneling on the Switch" on page 172 .)
2. Create a Service Provider VLAN, also referred to as an SPVLAN (see
"Configuring VLAN Groups" on page 158 ).
3.
Configure the QinQ tunnel access port to Tunnel mode (see "Adding an
Interface to a QinQ Tunnel" on page 173 ).
4. Configure the QinQ tunnel access port to join the SPVLAN as an
untagged member (see
"Adding Static Members to VLANs" on
page 160 ).
5.
Configure the SPVLAN ID as the native VID on the QinQ tunnel access
port (see
"Adding Static Members to VLANs" on page 160 ).