Configuration Guide User guide

804 FastIron Configuration Guide
53-1002494-02
802.1ad tagging configuration
BrocadeF(config-vlan-105)# tagged ethernet 2/1
BrocadeF(config-vlan-105)# untagged ethernet 1/5
BrocadeF(config-vlan-105)# exit
BrocadeF(config)# write memory
802.1ad tagging configuration
802.1ad tagging provides finer granularity for configuring 802.1Q tagging, enabling you to
configure 802.1Q tag-types on a group of ports. This feature allows you to create two identical
802.1Q tags (802.1ad tagging) on a single device. This enhancement improves SAV interoperability
between Brocade devices and other vendors’ devices that support the 802.1Q tag-types, but are
not very flexible with the tag-types they accept.
NOTE
Brocade devices treat a double-tagged Ethernet frame as a Layer 2 only frame. The packets are not
inspected for Layer 3 and Layer 4 information, and operations are not performed on the packet
utilizing Layer 3 or Layer 4 information.
Figure 88 shows an example application with 802.1ad tagging.
FIGURE 88 802.1ad configuration example
In Figure 88, 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 Brocade 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.
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