Alcatel-Lucent 060321-10, Rev. B, Cli Reference Manual

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spantree hello-time Distributed Spanning Tree Commands
page 5-20 OmniSwitch CLI Reference Guide March 2011
spantree hello-time
Configures the Spanning Tree hello time value for the flat mode Common and Internal Spanning Tree
(CIST) instance or for a per-VLAN mode VLAN instance. This value specifies the amount of time, in
seconds, between each transmission of a BPDU on any port that is the Spanning Tree root or is attempting
to become the Spanning Tree root.
spantree [cist | vlan vlan_id] hello-time seconds
Syntax Definitions
cist The CIST instance (also known as MSTI 0). This parameter is config-
urable in both modes (flat or per-VLAN).
vlan_id An existing VLAN ID number . This parameter is configurable in both
modes (flat or per-VLAN).
seconds Specifies the Hello time value in seconds. The valid range is 1–10.
Defaults
By default, the bridge hello time value is set to 2 seconds.
Platforms Supported
OmniSwitch 10K
Usage Guidelines
•
Lowering the Hello Time interval improves the robustness of the Spanning Tree Algorithm. Increasing
the Hello Time interval lowers the overhead of the Spanning Tree Algorithm.
•
If the optional cist or vlan parameter is not specified with this command, the hello time is configured
for the CIST instance by default. This is true regardless of which mode (flat or per-VLAN) is active for
the switch.
•
Although the cist and vlan parameters are configurable in both the flat and per-VLAN mode, the speci-
fied hello time value is not applied unless the supporting mode (flat for CIST or per-VLAN for a
VLAN instance) is active.
•
Note that for Multiple Spanning Tree Instances (MSTI), the hello time value is inherited from the CIST
instance and is not a configurable parameter.
Examples
-> spantree hello-time 5
-> spantree cist hello-time 5
-> spantree vlan 10 hello-time 3
parameter default
cist | vlan vlan_id cist