Brocade TurboIron 24X Series Configuration Guide - Manual (Page 442)

408 Brocade TurboIron 24X Series Configuration Guide
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Configuring 802.1Q-in-Q tagging
In Figure 50 , 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 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
• Since 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
“Enabling or disabling the Spanning Tree Protocol (STP)” on page 255 for a list of valid port
regions.
• If you configure a port with an 802.1Q tag-type, the 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 device automatically removes the 802.1Q tag-type from all ports within the
same port region.
• Devices support one configured tag-type per port along with the default tag-type of 8100.
Devices do not have the port region concept and do not support tag-profile.
• 802.1Q-in-Q tagging and VSRP are not supported together on the same device.
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 51 , 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 51 , 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