Alcatel 9000 Guía de usuario descargar pdf (Pagina 133)

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Configuring Spanning Tree Parameters Configuring STP Bridge Parameters

OmniSwitch 6800/6850/9000 Network Configuration Guide June 2006 page 6-17

Configuring the Bridge Max Age Time

The bridge max age time specifies how long, in seconds, the bridge retains Spanning Tree information it

receives from Configuration BPDU. When a bridge receives a BPDU, it updates its configuration informa-

tion and the max age timer is reset. If the max age timer expires before the next BPDU is received, the

bridge will attempt to become the root, designated bridge, or change its root port.

The max age time propagated in a root bridge Configuration BPDU is the value used by all other bridges

in the tree for their own max age time. Therefore, if this value is changed for the root bridge, all other

VLANs associated with the same instance will adopt this value as well.

If the switch is running in the 1x1 Spanning Tree mode, then a max age time value is defined for each

VLAN instance. If the switch is running in the flat Spanning Tree mode, then the max age value is defined

for the flat mode instance. In both cases, the default max age time used is 20 seconds.

Note that configuring a low max age time may cause Spanning Tree to reconfigure the topology more

often.

To change the bridge max age time value for a VLAN instance, specify a VLAN ID with the bridge max

age command when the switch is running in the 1x1 mode. For example, the following command changes

the max age time for VLAN 455 to 10 seconds:

-> bridge 455 max age 10

The explicit bridge 1x1 max age command configures the max age time for a VLAN instance when the

switch is running in either mode (1x1 or flat). For example, the following command performs the same

function as the command in the previous example:

-> bridge 1x1 455 max age 10

To change the max age time value for the flat mode instance, use either the bridge max age command or

the bridge cist max age command. Note that both commands are available when the switch is running in

either mode (1x1 or flat) and an instance number is not required. For example, the following commands

change the max age time for the flat mode instance to 10:

-> bridge max age 10

-> bridge cist max age 10

As in previous releases, it is possible to configure the flat mode instance with the bridge max age

command by specifying 1 as the instance number (e.g., bridge 1 max age 30). However, this is only avail-

able when the switch is already running in the flat mode and STP or RSTP is the active protocol.

Note that the max age time is not configurable for 802.1s Multiple Spanning Tree Instances (MSTI).

These instances inherit the max age time from the flat mode instance (CIST).

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