Configuration Guide User guide

FastIron Configuration Guide 757
53-1002494-02
VLAN overview
FIGURE 77 VLANs configured across multiple devices
Support for 802.1ad (Q-in-Q) tagging
Brocade devices provide finer granularity for configuring 802.1Q tagging, enabling you to configure
802.1Q tag-types on a group of ports, thereby enabling the creation of 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.
• FastIron X Series devices support one value for tag-type, which is defined at the global level.
• FastIron WS and Brocade FCX Series devices support one value for tag-type, which is defined
at the global level, and one value for tag-profile, which is defined at the global and interface
level of the CLI.
User-configured port-based VLAN
T = 802.1Q tagged port
TT
T
T
T
T
Segment 1
Segment 2
T
Segment 2
Segment 1
Tagging is required for the ports
on Segment 1 because the ports
are in multiple port-based VLANs.
Without tagging, a device receiving
VLAN traffic from the other device
would not be sure which VLAN the
traffic is for.
Tagging is not required for the ports
on Segment 2 because each port is
in only one port-based VLAN.