Technical data

BLADE OS 5.0 Command Reference
222
 Chapter 6: The Configuration Menu BMD00142, November 2009
/cfg/l2/mrst
RSTP/MSTP Configuration
BLADE OS supports the IEEE 802.1w Rapid Spanning Tree Protocol (RSTP), IEEE 802.1s
Multiple Spanning Tree Protocol (MSTP), and Per VLAN Rapid Spanning Tree Protocol (PVRST).
MSTP allows you to map many VLANs to a small number of Spanning Tree Groups (STGs), 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/PVRST) ON
off - Globally turn Multiple Spanning Tree (MSTP/RSTP/PVRST) OFF
cur - Display current MST parameters
Table 121 MSTP/RSTP/PVRST Configuration Options
Command Syntax and Usage
cist
Displays the Common Internal Spanning Tree (CIST) menu. To view menu options, see
page 224.
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 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 traverse before it is dropped.
The default is 20.