Bridge Cist Forward Delay - Alcatel-Lucent OmniSwitch 6250 Cli Reference Manual

Distributed Spanning Tree Commands

bridge cist forward delay

Configures the bridge forward delay time value for the flat mode Common and Internal Spanning Tree
(CIST) instance. This value is the amount of time, in seconds, that determines how fast a port changes its
Spanning Tree state until it reaches a forwarding state. The forward delay time specifies how long a port
stays in the listening and learning states, which precede the forwarding state.
bridge cist forward delay seconds
Syntax Definitions
seconds
Defaults
By default, the bridge forward delay time value is set to 15 seconds.
Platforms Supported
OmniSwitch 6250
Usage Guidelines
•
A low forward delay time can cause temporary loops in the network, because data may get forwarded
before the reconfiguration message has reached all nodes on the network.
•
The forward delay time is also used to age out all dynamic MAC address entries in the forwarding
table (MAC address table) when a topology change occurs.
•
This command is an explicit Spanning Tree command that only applies to the flat mode CIST instance
regardless of which operating mode (flat or 1x1) or protocol is active on the switch.
•
If the switch is running in 1x1 mode when this command is used, the specified forward delay time
value is not active for the CIST instance until the operating mode for the switch is changed to the flat
mode.
•
Note that when a configuration snapshot is taken of the switch, all Spanning Tree commands are saved
in their explicit format.
Examples
-> bridge mode flat
-> bridge cist forward delay 10
-> bridge cist forward delay 30
-> bridge mode 1x1
-> bridge cist forward delay 25
-> bridge cist forward delay 4
Release History
Release 6.6.1; command was introduced.
OmniSwitch 6250 CLI Reference Guide
Forward delay time in seconds (4–30).
November 2009 page 16-43