Reference Guide

942 | Multiple Spanning Tree Protocol (MSTP)
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max-hops
c e s
Configure the maximum hop count.
Syntax
max-hops number
To return to the default values, enter no max-hops.
Parameters
Defaults
20 hops
Command Modes
MULTIPLE SPANNING TREE
Command
History
Usage
Information
The max-hops is a configuration command that applies to both the IST and all MST instances in the
MSTP region. The BPDUs sent out by the root switch set the remaining-hops parameter to the
configured value of max-hops. When a switch receives the BPDU, it decrements the received value of
the remaining hops and uses the resulting value as remaining-hops in the BPDUs. If the
remaining-hops reaches zero, the switch discards the BPDU and ages out any information that it holds
for the port.
msti
c e s
Configure Multiple Spanning Tree instance, bridge priority, and one or multiple VLANs mapped to the
MST instance.
Syntax
msti instance {vlan range | bridge-priority priority}
To disable mapping or bridge priority no msti instance {vlan range | bridge-priority priority}
Parameters
Defaults
default bridge-priority is 32768
Command Modes
INTERFACE
range
Enter a number for the maximum hop count.
Range: 1 to 40
Default: 20
Version 7.6.1.0 Added support for S-Series
Version 7.5.1.0 Added support for C-Series
Version 6.5.1.0 Introduced
msti instance
Enter the Multiple Spanning Tree Protocol Instance
Range: zero (0) to 63
vlan range Enter the keyword vlan followed by the identifier range value.
Range: 1 to 4094
bridge-priority priority Enter the keyword bridge-priority followed by a value in increments of
4096 as the bridge priority.
Range: zero (0) to 61440
Valid priority values are: 0, 4096, 8192, 12288, 16384, 20480, 24576,
28672, 32768, 36864, 40960, 45056, 49152, 53248, 57344, and 61440. All
other values are rejected.