Technical data

RackSwitch G8124 Command Reference
Chapter 4: Configuration Commands
 139BMD00076, January 2009
Multiple Spanning Tree Protocol Configuration
The switch supports the IEEE 802.1D/2004 Rapid Spanning Tree Protocol (RSTP) and
IEEE 802.1Q/2003 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 Span-
ning Tree Groups (STGs), each with its own topology. Up to 32 STGs can be configured in
mstp mode. MSTP 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.
Table 4-29 Multiple Spanning Tree Configuration Commands
Command Syntax and Usage
[no] spanning-tree mstp name <1-32 characters>
Configures a name for the MSTP region. All devices within a MSTP region must have the same
region name.
Command mode: Global configuration
spanning-tree mstp version <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.
The default value is 0 (zero).
Command mode: Global configuration
spanning-tree mstp maximum-hop <4-60>
Configures the maximum number of bridge hops a packet may traverse before it is dropped.
The default is 20.
Command mode: Global configuration
spanning-tree mode {pvrst|rstp|mst|disable}
Selects the Spanning Tree mode, as follows: Per VLAN Rapid Spanning Tree Plus (pvsrt),
Rapid Spanning Tree (rstp) Multiple Spanning Tree (mst), or disabled.
Command mode: Global configuration
show spanning-tree mstp mrst
Displays the current MSTP configuration.
Command mode: All