Reference Guide

1046 | Multiple Spanning Tree Protocol (MSTP)
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Parameters
Defaults
cost
= depends on the interface type; priority = 128
Command Modes
INTERFACE
Command
History
spanning-tree mstp
c e s
Configures a Layer 2 MSTP interface as an edge port with (optionally) a Bridge
Protocol Data Unit (BPDU) guard, or enables the root guard or loop guard feature on
the interface.
Syntax
spanning-tree mstp {edge-port [bpduguard [shutdown-on-violation]] | loopguard |
rootguard
}
Parameters
msti instance Enter the keyword msti and the MST Instance number.
Range: zero (0) to 63
cost cost (OPTIONAL) Enter the keyword cost followed by the port cost value.
Range: 1 to 200000
Defaults:
• 100 Mb/s Ethernet interface = 200000
• 1-Gigabit Ethernet interface = 20000
• 10-Gigabit Ethernet interface = 2000
• Port Channel interface with one 100 Mb/s Ethernet = 200000
• Port Channel interface with one 1-Gigabit Ethernet = 20000
• Port Channel interface with one 10-Gigabit Ethernet = 2000
• Port Channel with two 1-Gigabit Ethernet = 18000
• Port Channel with two 10-Gigabit Ethernet = 1800
• Port Channel with two 100-Mbps Ethernet = 180000
priority priority Enter keyword priority followed by a value in increments of 16 as the
priority.
Range: 0 to 240.
Default: 128
Version 8.3.19.0 Introduced on S4820T
Version 8.3.7.0 Introduced on S4810
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 on E-Series
edge-port
Enter the keyword edge-port to configure the interface as a Multiple Spanning
Tree edge port.
bpduguard
(OPTIONAL) Enter the keyword portfast to enable Portfast to move the
interface into forwarding mode immediately after the root fails.
Enter the keyword bpduguard to disable the port when it receives a BPDU.
shutdown-on-vi
olation
(OPTIONAL) Enter the keyword shutdown-on-violation to hardware disable
an interface when a BPDU is received and the port is disabled.