Configuration Guide User guide

758 FastIron Configuration Guide
53-1002494-02
VLAN overview
802.1 ad tagging for FastIron WS and Brocade FCX Series devices
The following enhancements allow the FastIron WS and Brocade FCX Series devices, including
those in an IronStack, to use Q-in-Q and SAV, by allowing the changing of a tag profile for ports:
• In addition to the default tag type 0x8100, you can now configure one additional global tag
profile with a number from 0xffff.
• Tag profiles on a single port, or a group of ports can be configured to point to the global tag
profile.
For example applications and configuration details, refer to “802.1ad tagging configuration” on
page 804.
To configure a global tag profile, enter the following command in the configuration mode.
Brocade(config)# tag-profile 9500
Syntax: [no] tag-profile <tag-no>
<tag-no> - the number of the tag, can be 0x8100 (default), or 0xffff
To direct individual ports or on a range of ports to this tag profile, enter commands similar to the
following.
Brocade(config)# interface ethernet 1/1/1
Brocade(config-if-e1000-1/1/1)# tag-profile enable
Brocade(config-mif-1/1/1,1/2/1)# tag-profile enable
Spanning Tree Protocol (STP)
The default state of STP depends on the device type:
• STP is disabled by default on Brocade Layer 3 switches.
• STP is enabled by default on Brocade Layer 2 switches.
Also by default, each port-based VLAN has a separate instance of STP. Thus, when STP is globally
enabled, each port-based VLAN on the device runs a separate spanning tree.
You can enable or disable STP on the following levels:
• Globally – Affects all ports on the device.
NOTE
If you configure a port-based VLAN on the device, the VLAN has the same STP state as the
default STP state on the device. Thus, on Layer 2 switches, new VLANs have STP enabled by
default. On Layer 3 switches, new VLANs have STP disabled by default. You can enable or
disable STP in each VLAN separately. In addition, you can enable or disable STP on individual
ports.
• Port-based VLAN – Affects all ports within the specified port-based VLAN.
STP is a Layer 2 protocol. Thus, you cannot enable or disable STP for individual protocol VLANs or
for IP subnet, IPX network, or AppleTalk cable VLANs. The STP state of a port-based VLAN
containing these other types of VLANs determines the STP state for all the Layer 2 broadcasts
within the port-based VLAN. This is true even though Layer 3 protocol broadcasts are sent on Layer
2 within the VLAN.