HP 445860-B21 - 10Gb Ethernet BL-c Switch Reference Manual page 130

Multiple Spanning Tree Configuration commands
Table 104
Command
spanning-tree mstp maximum-hop
<4-60>
spanning-tree mode
{mst|rstp|pvst}
show spanning-tree mstp mrst
NOTE:
IEEE 802.1w standard-based RSTP implementation runs on one STG (i.e. same as one spanning tree
instance) only. As a result, if 'rstp' mode is selected, then only a single RSTP instance (default for STG 1) is
supported for all VLANs, including the Default VLAN 1.
If multiple spanning tree instances are required, then select 'mstp' mode so that multiple VLANs are handled
by multiple spanning tree instances, as specified by IEEE 802.1s standard-based MSTP implementation.
IEEE 802.1s MSTP supports rapid convergence using IEEE 802.1w RSTP.
PVST+ does not support rapid convergence in current versions.
NOTE:
The following configurations are unsupported:
HP PVST+ (default Spanning Tree setting) is NOT interoperable with Cisco Rapid PVST+.
HP MSTP/RSTP (with mode set to either 'mstp' or 'rstp') is NOT interoperable with Cisco Rapid PVST+.
The following configurations are supported:
HP PVST+ (default Spanning Tree setting) is interoperable with Cisco PVST+.
HP MSTP/RSTP (with mode set to 'mstp') is interoperable with Cisco MST/RSTP.
Description
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.
Command mode: Global configuration
Selects the spanning-tree mode, as follows:
Rapid Spanning Tree mode (rstp)
Multiple Spanning Tree mode (mstp)
Per VLAN Spanning Tree (pvst)
The default mode is pvst.
Command mode: Global configuration
Displays the current RSTP/MSTP configuration.
Command mode: All
Configuration Commands
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