Brocade FastIron Ethernet Switch Platform and Layer 2 Swit Manual de usuario descargar pdf (Pagina 257)

Changing STP port parameters

To change the path and priority costs for a port, enter commands such as the following.

device(config)#vlan 10

device(config-vlan-10)#spanning-tree ethernet 5 path-cost 15 priority 64

Syntax: spanning-tree ethernet port path-cost value | priority value | disable | enable

The path-cost value parameter specifies the port cost as a path to the spanning tree root bridge. STP

prefers the path with the lowest cost. You can specify a value from 0 - 65535.

The default depends on the port type:

• 10 Mbps - 100

• 100 Mbps - 19

• Gbps - 4

• 10 Gbps - 2

• The priorityvalue parameter specifies the preference that STP gives this port relative to other ports

for forwarding traffic out of the spanning tree. If you are upgrading a device that has a configuration

saved under an earlier software release, and the configuration contains a value from 0 - 7 for a port

STP priority, the software changes the priority to the default when you save the configuration while

running the new release.

The disable and enable parameter disables or re-enables STP on the port. The STP state change

affects only this VLAN. The port STP state in other VLANs is not changed.

STP protection enhancement

STP protection provides the ability to prohibit an end station from initiating or participating in an STP

topology change.

The 802.1W Spanning Tree Protocol (STP) detects and eliminates logical loops in a redundant network

by selectively blocking some data paths (ports) and allowing only the best data paths to forward traffic.

In an STP environment, switches, end stations, and other Layer 2 devices use Bridge Protocol Data

Units (BPDUs) to exchange information that STP will use to determine the best path for data flow. When

a Layer 2 device is powered ON and connected to the network, or when a Layer 2 device goes down, it

sends out an STP BPDU, triggering an STP topology change.

In some instances, it is unnecessary for a connected device, such as an end station, to initiate or

participate in an STP topology change. In this case, you can enable the STP Protection feature on the

Brocade port to which the end station is connected. STP Protection disables the connected device

ability to initiate or participate in an STP topology change, by dropping all BPDUs received from the

connected device.

Enabling STP protection

You can enable STP Protection on a per-port basis.

To prevent an end station from initiating or participating in STP topology changes, enter the following

command at the Interface level of the CLI.

device#(config) interface ethernet 2

device#(config-if-e1000-2)#stp-protect

This command causes the port to drop STP BPDUs sent from the device on the other end of the link.

Syntax: [no] stp-protect

Changing STP port parameters

FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide 257

53-1003086-04

1 2 ... 252 253 254 255 256 257 258 259 260 261 262 ... 453 454

Comentarios a estos manuales

Sin comentarios

Brocade FastIron Ethernet Switch Platform and Layer 2 Swit Manual de usuario Pagina 257

Comentarios a estos manuales

Relacionado con productos y manuales para Accesorios De Computador Brocade FastIron Ethernet Switch Platform and Layer 2 Swit