Configuration Guide User guide

558 FastIron Configuration Guide
53-1002494-02
Enabling or disabling the Spanning Tree Protocol (STP)
• A 48-port Gbps module has two port regions:
- Ports 1-24 and SFP ports 1& 2 belong to port region 0
- Ports 25-48 and SFP ports 3 & 4 belong to port region 1
ICX 6450 device port regions
• A 24-port Gbps module has one port region. The four SFP+ ports on the device also belong to
this single port region.
• A 48-port Gbps module has two port regions:
- Ports 1-24 and SFP+ ports 1& 2 belong to port region 0
- Ports 25-48 and SFP+ ports 3 & 4 belong to port region 1
Enabling or disabling the Spanning Tree Protocol (STP)
STP (IEEE 802.1D bridge protocol) is supported on all Brocade devices. STP detects and eliminates
logical loops in the network. STP also ensures that the least cost path is taken when multiple paths
exist between ports or VLANs. If the selected path fails, STP searches for and then establishes an
alternate path to prevent or limit retransmission of data.
NOTE
This section provides instructions for enabling and disabling STP. For configuration procedures and
more information about STP, refer to Chapter 27, “Spanning Tree Protocol” in this guide.
STP must be enabled at the system level to allow assignment of this capability on the VLAN level.
On devices running Layer 2 code, STP is enabled by default. On devices running Layer 3 code, STP
is disabled by default.
To enable STP for all ports on a Brocade device, enter the following command.
Brocade(config)#spanning tree
Syntax: [no] spanning-tree
You can also enable and disable spanning tree on a port-based VLAN and on an individual port
basis, and enable advanced STP features. Refer to Chapter 27, “Spanning Tree Protocol”.
Modifying STP bridge and port parameters
You can modify the following STP Parameters:
• Bridge parameters – forward delay, maximum age, hello time, and priority
• Port parameters – priority and path cost
For configuration details, refer to “Changing STP bridge and port parameters” on page 1091.