BLADE OS™ ISCLI Reference HP GbE2c L2/L3 Ethernet Blade Switch Version 5.1 Advanced Functionality Software

BLADE OS 5.1 ISCLI Reference
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 Chapter 4: Configuration Commands BMD00115, August 2009
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 or have limitations:
- HP PVST+ (default Spanning Tree setting) is interoperable with Cisco Rapid PVST+ only in
fallback mode: Cisco will fall back to legacy PVST+ when detecting PVST+ BPDUs by default.
- 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.
- HP PVRST is interoperable with Cisco Rapid PVST+.
spanning-tree mode [mst|pvrst|pvst|rstp]
Selects and enables Multiple Spanning Tree mode (mst), Per VLAN Rapid Spanning Tree
mode (pvrst), Per VLAN Spanning Tree mode (pvst), or Rapid Spanning Tree mode
(rstp).
The default mode is RSTP.
Command mode: Global configuration
show spanning-tree mstp mrst
Displays the current RSTP/MSTP/PVRST configuration.
Command mode: All
Table 137 Multiple Spanning Tree Configuration Commands
Command Syntax and Usage