HP GbE2c HP GbE2c Ethernet Blade Switch for c-Class BladeSystem ISCLI Referenc - Page 101

Rapid Spanning Tree Protocol / Multiple Spanning Tree Protocol configuration

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Rapid Spanning Tree Protocol / Multiple Spanning Tree Protocol configuration The switch 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. MSTP supports up to 31 Spanning Tree Groups on the switch (STG 32 is reserved for switch management). MRST 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. The following table describes the Multiple Spanning Tree Configuration commands. Table 103 Multiple Spanning Tree Configuration commands Command Description [no] spanning-tree mstp name {} 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 {} Configures the revision level for the MSTP region. The revision level is used as a numerical identifier for the region. All devices within a MSTP region must have the same revision level number. The range is 0-65535. Command mode: Global configuration spanning-tree mstp maximum- Configures the maximum number of bridge hops a packet may to traverse before hop it is dropped. The range is from 4 to 60 hops. The default is 20. Command mode: Global configuration spanning-tree mrst mode {mst|rstp|pvst} 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 RSTP. Command mode: Global configuration spanning-tree mrst enable Globally turn RSTP/MSTP on. Note: When RSTP is turned on, the configuration parameters for STP group 1 apply to RSTP. Command mode: Global configuration no spanning-tree mrst enable Globally turn RSTP/MSTP off. Command mode: Global configuration show spanning-tree mstp mrst Displays the current RSTP/MSTP configuration. Command mode: All 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. Configuration Commands 101

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Configuration Commands 101
Rapid Spanning Tree Protocol / Multiple Spanning Tree Protocol
configuration
The switch 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.
MSTP supports up to 31 Spanning Tree Groups on the switch (STG 32 is reserved for switch management). MRST 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.
The following table describes the Multiple Spanning Tree Configuration commands.
Table 103
Multiple Spanning Tree Configuration commands
Command
Description
[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 the revision level for the MSTP region. The revision level is used as a
numerical identifier for the region. All devices within a MSTP region must have the
same revision level number. The range is 0-65535.
Command mode
: Global configuration
spanning-tree mstp maximum-
hop
<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.
Command mode
: Global configuration
spanning-tree mrst mode
{mst|rstp|pvst}
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 RSTP.
Command mode
: Global configuration
spanning-tree mrst enable
Globally turn RSTP/MSTP on.
Note
: When RSTP is turned on, the configuration parameters for STP group 1
apply to RSTP.
Command mode
: Global configuration
no spanning-tree mrst
enable
Globally turn RSTP/MSTP off.
Command mode
: Global configuration
show spanning-tree mstp
mrst
Displays the current RSTP/MSTP configuration.
Command mode
: All
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.