Specifications

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Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5 Software Configuration Guide, Cisco IOS Release 15.1(3)MR
OL-26895-01
Chapter 8 Configuring IEEE 802.1Q Tunneling and Layer 2 Protocol Tunneling
Understanding VLAN Mapping
• Traditional 802.1Q tunneling (QinQ)—Performs all-to-one bundling of C-VLAN IDs to a single
S-VLAN ID for the port. The S-VLAN is added to the incoming unmodified C-VLAN. You can
configure the port as an 802.1Q tunnel port for traditional QinQ, or you can configure selective
QinQ for a more flexible implementation. Mapping takes place at ingress and egress of the port. All
packets on the port are bundled into the specified S-VLAN.
Untagged packets enter the router on the trunk with the native VLAN and are not mapped.
Note The Cisco MWR 2941 does not support one-to-one VLAN mapping.
Note The Cisco MWR 2941 does not currently support ingress classification and marking on dot1q interfaces.
For information about Quality of Service, see the Release Notes for Cisco MWR 2941 Mobile Wireless
Edge Router and Chapter 25, “Configuring Quality of Service.”
Mapping Customer VLANs to Service-Provider VLANs
Figure 8-4 shows a topology where a customer uses the same VLANs in multiple sites on different sides
of a service-provider network. You map the customer VLAN IDs to service-provider VLAN IDs for
packet travel across the service-provider backbone. The customer VLAN IDs are retrieved at the other
side of the service-provider backbone for use in the other customer site. Configure the same set of VLAN
mappings at a customer-connected port on each side of the service-provider network.
See the examples following the configuration steps for using one-to-one mapping, traditional QinQ, or
selective QinQ to map customer VLANs 1 to 5 to service-provider VLANs.
Figure 8-4 Mapping Customer VLANs
Service provider
Customer A
VLANs 1-5
Host
Host
Customer A
VLANs 1-5
Customer A
VLANs 1-5
Customer
switches
Customer
switch
Trunk
ports
dot1q
Tunnel Port
VLAN mapping at
customer-connecting ports
dot1q
Tunnel Port
Trunk
port
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