Configuring VLANs

Enable Spanning Tree on a VLAN

The spanning tree bridge and port parameters are configurable using one CLI command set at the Global Configuration Level of each Port-based VLAN. Suppose you wanted to enable the IEEE 802.1d STP across VLAN 3. To do so, use the following method.

NOTE: When port-based VLANs are not operating on the system, STP is set on a system-wide level at the global CONFIG level of the CLI.

USING THE CLI

1.Access the global CONFIG level of the CLI on 6208M-SX A by entering the following commands:

HP6208-A> enable

No password has been assigned yet...

HP6208-A# configure terminal HP6208-A(config)#

2.Access the level of the CLI for configuring port-based VLAN 3 by entering the following command:

HP6208-A(config)# HP6208-A(config)# vlan 3 HP6208-A(config-vlan-3)#

3.From VLAN 3’s configuration level of the CLI, enter the following command to enable STP on all tagged and untagged ports associated with VLAN 3.

HP6208-B(config-vlan-3)# HP6208-B(config-vlan-3)# spanning-tree HP6208-B(config-vlan-3)#

4.Enter the following commands to exit the VLAN CONFIG mode and save the configuration to the system­ config file on flash memory:

HP6208-B(config-vlan-3)# HP6208-B(config-vlan-3)# end HP6208-B# write memory HP6208-B#

5.Repeat steps 1 – 4 on 6208M-SX B.

NOTE: You do not need to configure values for the STP parameters. All parameters have default values as noted below. Additionally, all values will be globally applied to all ports on the system or on the port-based VLAN for which they are defined.

To configure a specific path-cost or priority value for a given port, enter those values using the key words in the brackets [ ] shown in the syntax summary below. If you do not want to specify values for any given port, this portion of the command is not required.

Syntax: vlan <vlan-id> by port

Syntax: [no] spanning-tree

Syntax: spanning-tree [ethernet <portnum> path-cost <value> priority <value>] forward-delay <value> hello-time <value> maximum-age <time> priority <value>

Bridge STP Parameters (applied to all ports within a VLAN)

•Forward Delay – the period of time a bridge will wait (the listen and learn period) before forwarding data packets. Possible values: 4 – 30 seconds. Default is 15.

•Maximum Age – the interval a bridge will wait for receipt of a hello packet before initiating a topology change. Possible values: 6 – 40 seconds. Default is 20.

•Hello Time – the interval of time between each configuration BPDU sent by the root bridge. Possible values: 1 – 10 seconds. Default is 2.

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