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Alteon OS Command Reference
The Configuration Menu
22143W7774, May 2007
/cfg/l2/mrst
Rapid Spanning Tree Protocol/
Multiple Spanning Tree Protocol Configuration
Alteon OS 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.
Up to 32 Spanning Tree Groups can be configured in mstp mode. MRST is turned off by
default.
NOTE – When Multiple Spanning Tree is turned on, VLAN 4095 is moved from Spanning Tree
Group 128 to the Common Internal Spanning Tree (CIST). When Multiple Spanning Tree is
turned off, VLAN 4095 is moved back to Spanning Tree Group 128.
[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 turn Multiple Spanning Tree (MSTP/RSTP) ON
off - Globally turn Multiple Spanning Tree (MSTP/RSTP) OFF
cur - Display current MST parameters
Table 6-33 MSTP/RSTP Configuration Menu Options (/cfg/l2/mrst)
Command Syntax and Usage
cist
Displays the Common Internal Spanning Tree (CIST) Menu. To view menu options, see page 223.
name <1-32 characters>
Configures a name for the MSTP region. All devices within a MSTP region must have the same
region name.
rev <1-65535>
Configures a version number for the MSTP region. The version is used as a numerical identifier
for the region. All devices within a MSTP region must have the same version number.
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 is 20.