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PowerConnect B-Series FCX Configuration Guide 485
53-1002266-01
Configuring 802.1Q-in-Q tagging
13
FIGURE 103 802.1Q-in-Q configuration example
In Figure 103, the untagged ports (to customer interfaces) accept frames that have any
802.1Q tag other than the configured tag-type 9100. These packets are considered untagged
on this incoming port and are re-tagged when they are sent out of the uplink towards the
provider. The 802.1Q tag-type on the uplink port is 8100, so the Dell PowerConnect device will
switch the frames to the uplink device with an additional 8100 tag, thereby supporting devices
that only support this method of VLAN tagging.
Configuration rules
• Because the uplink (to the provider cloud) and the edge link (to the customer port) must have
different 802.1Q tags, make sure the uplink and edge link are in different port regions. Refer to
“About port regions” on page 306 for a list of valid port regions.
• On devices that support port regions, if you configure a port with an 802.1Q tag-type, the Dell
PowerConnect device automatically applies the 802.1Q tag-type to all ports within the same
port region. Likewise, if you remove the 802.1Q tag-type from a port, the Dell PowerConnect
device automatically removes the 802.1Q tag-type from all ports within the same port region.
• 802.1Q-in-Q tagging and VSRP are not supported together on the same device.
• In addition to tag-type, PowerConnect B-Series FCX devices support tag-profile. For more
information, refer to “Configuring 802.1Q-in-Q tag profiles” on page 488.
Enabling 802.1Q-in-Q tagging
To enable 802.1Q-in-Q tagging, configure an 802.1Q tag on the untagged edge links (the customer
ports) to any value other than the 802.1Q tag for incoming traffic. For example, in Figure 104, the
802.1Q tag on the untagged edge links (ports 11 and 12) is 9100, whereas, the 802.1Q tag for
incoming traffic is 8100.
To configure 802.1 Q-in-Q tagging as shown in Figure 104, enter commands such as the following
on the untagged edge links of devices C and D.
To customer interface
Uplink to provider cloud
Untagged
Tagged
DA
SA
8100
Customer
VLAN
DA SA 8100
Customer
VLAN
Provider
VLAN
8100
Configured tag-type 9100
Default tag-type 8100
Provider Edge Switch