OmniSwitch os6900, Руководство по настройке сети

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Configuring Spanning Tree Parameters Using Spanning Tree Configuration Commands
OmniSwitch AOS Release 7 Network Configuration Guide June 2013 page 6-25
Primary port functionality. The path cost assigned to the aggregate link is not the same between
OmniSwitch and Cisco switches since vendor-specific formulas are used to derive the path cost.
Manual configuration is recommended to match the Cisco path cost assignment for an aggregate link.
For more information on the configuration of path cost for aggregate links, refer
“Path Cost for Link
Aggregate Ports” on page 6-38 .
The table below shows the default Spanning Tree values.
Using Spanning Tree Configuration Commands
The Alcatel-Lucent Spanning Tree implementation uses commands that contain one of the following
keywords to specify the type of Spanning Tree instance to modify:
•
cist – command applies to the Common and Internal Spanning Tree instance. The CIST is the single
Spanning Tree flat mode instance that is available on all switches. When using STP or RSTP, the CIST
is also known as instance 1 or bridge 1.
•
msti – command applies to the specified Multiple Spanning Tree Instance. When using MSTP
(802.1s), the CIST instance is also known as MSTI 0.
•
vlan – command applies to the specified VLAN instance.
These commands (referred to as explicit commands) allow the configuration of a particular Spanning Tree
instance independent of which mode and/or protocol is currently active on the switch. The configuration,
however, does not go active until the switch is changed to the appropriate mode. For example, if the
switch is running in the per-VLAN mode, the following explicit command changes the MSTI 3 priority to
12288:
-> spantree msti 3 priority 12288
Even though the above command is accepted in the per-VLAN mode, the new priority value does not take
effect until the switch mode is changed to flat mode.
Note . When a snapshot is taken of the switch configuration, the explicit form of all Spanning Tree
commands is captured. For example, if the priority of MSTI 2 was changed from the default value to a
priority of 16384, then
spantree msti 2 priority 16384 is the command captured to reflect this in the
Parameters OmniSwitch Cisco
Mac Reduction Mode Enabled Disabled
Bridge Priority 32768 32768
Port Priority 128 32 (catOS) / 128 (IOS)
Port Path Cost IEEE Port Speed Table IEEE Port Speed Table
Aggregate Path Cost Proprietary Table Avg Path Cost / NumPorts
Default Path Cost Mode Short (16-bit) Short (16-bit)
Max Age 20 20
Hello Time 2 2
Forward Delay Time 15 15
Default Protocol RSTP (1w) Per Vlan PVST+ (1d) Per Switch