Reference v4.1.0 Instruction Manual

466 Network OS Command Reference

53-1003115-01

max-age

Sets the interval time in seconds between messages that the spanning tree receives from the

interface.

Synopsis max-age seconds

no max-age

Operands seconds Configures the Spanning Tree Protocol interface maximum age. Valid

values range from 6 through 40.

Defaults 20 seconds.

Command Modes Protocol Spanning Tree configuration mode

Description Use this command to control the maximum length of time that passes before an interface saves its

configuration Bridge Protocol Data Unit (BPDU) information.

If the VLAN parameter is not provided, the seconds value is applied globally for all

per-VLAN instances. However, for VLANs that have been configured explicitly, the

per-VLAN configuration takes precedence over the global configuration.

On the Brocade VDX family of switches, VLANs are treated as interfaces from a configuration point

of view. By default, all the DCB ports are assigned to VLAN 1 (VLAN ID equals 1). Valid VLAN IDs

are as follows:

• On Brocade VDX 8770 switches: 1 through 4086 for 802.1Q VLANs (VLAN IDs 4087

through 4095 are reserved on these switches), and 4096 through 8191 for service or

transport VFs in a Virtual Fabrics context.

• On all other Brocade VDX switches: 1 through 3962 for 802.1Q VLANs (VLAN IDs 3963

through 4095 are reserved on these switches), and 4096 through 8191 for service or

transport VFs in a Virtual Fabrics context

Usage Guidelines When configuring the maximum age, the max-age command setting must be greater than the

hello-time command setting. The following relationship should be kept:

2*(forward-delay - 1)>=max-age>=2*(hello-time + 1)

If xSTP is enabled over VCS, this command must be executed on all RBridges.

Enter no max-age to return to the default configuration.

Examples To configure the maximum-age to 10 seconds:

switch(conf-rstp)# max-age 10