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Configuration Menu 140
Rapid Spanning Tree Protocol/
Multiple Spanning Tree Protocol configuration
Command: /cfg/l2/mrst
[Multiple Spanning Tree Menu]
cist - Common and Internal Spanning Tree menu
name - Set MST region name
rev - Set revision level of this MST region
maxhop - Set Maximum Hop Count for MST (4 - 60)
mode - Spanning Tree Mode
on - Globally turns RSTP/MSTP ON
off - Globally turns RSTP/MSTP OFF
cur - Display current MST parameters
The switch supports the IEEE 802.1w Rapid Spanning Tree Protocol (RSTP) and IEEE 802.1s Multiple
Spanning Tree Protocol (MSTP). MSTP allows you to map many VLANs to a small number of spanning
tree groups, each with its own topology.
MSTP supports up to 32 Spanning Tree Groups on the switch (STG 32 is reserved for switch
management). MRST is turned off by default.
NOTE: When Multiple Spanning Tree is turned on, VLAN 1 is moved from Spanning Tree Group 1
to the Common Internal Spanning Tree (CIST). When Multiple Spanning Tree is turned off, VLAN 1
is moved back to Spanning Tree Group 1.
The following table describes the Multiple Spanning Tree Configuration Menu options.
Table 108
Multiple Spanning Tree Configuration Menu options
Command Description
cist
Displays the Common Internal Spanning Tree (CIST) Menu.
name <1-32
characters>
Configures a name for the MSTP region. All devices within a MSTP region must have
the same region name.
rev <0-65535>
Configures the revision level for the MSTP region. The revision level is used as a
numerical identifier for the region. All devices within a MSTP region must have the
same revision level number. The default value is 1.
maxhop <4-60>
Configures the maximum number of bridge hops a packet may to traverse before it is
dropped. The range is from 4 to 60 hops. The default value is 20.
rstp|mstp|pvrst
Selects the spanning-tree mode, as follows:
• Multiple Spanning Tree mode (mst )
• Rapid Spanning Tree mode (rstp)
• Per-VLAN Rapid Spanning Tree (pvrst)
The default mode is RSTP.
on
Globally turn RSTP/MSTP ON.
When RSTP is turned on, the configuration parameters for STP group 1 apply to RSTP.
off
Globally turn RSTP/MSTP OFF.
cur
Displays the current RSTP/MSTP configuration.