Configuration rules, Enabling 802.1q-in-q tagging – Brocade BigIron RX Series Configuration Guide User Manual
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BigIron RX Series Configuration Guide
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Configuring 802.1q-in-q tagging
11
shows an example application of the 802.1Q-in-Q enhancement.
FIGURE 26
802.1Q-in-Q configuration example
In
, 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
Follow the rules below when configuring 802.1q-in-q tagging:
•
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.
•
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.
•
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.
•
The device supports on configured tag-type per device, along with the default tag-type of 8100.
For example, if you configure an 802.1Q tag of 9100 on ports 1 – 8, then later configure an
802.1Q tag of 5100 on port 9, the device automatically applies the 5100 tag to all ports in the
same port region as port 9, and also changes the 802.1Q tag-type on ports 1 – 8 to 5100.
Enabling 802.1Q-in-Q tagging
To enable the 802.1Q-in-Q feature, configure an 802.1Q tag type on the untagged edge links (the
customer ports) to any value other than the 802.1Q tag for incoming traffic.
, 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
, enter commands such as the following on
the untagged edge links of devices C and D.
BigIron RX(config)# tag-type 9100 ethernet 3/1 to 3/2
BigIron RX(config)# aggregated-vlan
To customer interface
Provider
Edge Switch
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