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Spanning Tree Commands
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4
spanning-tree mst cost
This command configures the path cost on a spanning instance in the Multiple
Spanning Tree. Use the
no
form to restore the default.
Syntax
spanning-tree mst
instance_id
cost
cost
no spanning-tree mst
instance_id
cost
•
instance_id
- Instance identifier of the spanning tree.
(Range: 0-4094, no leading zeroes)
•
cost
- Path cost for an interface. (Range: 0 for auto-configuration, 1-65535
for short path cost method25, 1-200,000,000 for long path cost method)
The recommended path cost range is listed in Table 4-63 on
page 4-206. The recommended path cost is listed in Table 4-64 on
page 4-207.
Default Setting
By default, the system automatically detects the speed and duplex mode used
on each port, and configures the path cost according to the values shown
below. Path cost “0” is used to indicate auto-configuration mode.
• Ethernet – half duplex: 2,000,000; full duplex: 1,000,000; trunk: 500,000
• Fast Ethernet – half duplex: 200,000; full duplex: 100,000; trunk: 50,000
• Gigabit Ethernet – full duplex: 10,000; trunk: 5,000
• 10 Gigabit Ethernet – full duplex: 1000; trunk: 500
Command Mode
Interface Configuration (Ethernet, Port Channel)
Command Usage
• Each spanning-tree instance is associated with a unique set of VLAN IDs.
• This command is used by the multiple spanning-tree algorithm to determine
the best path between devices. Therefore, lower values should be assigned
to interfaces attached to faster media, and higher values assigned to
interfaces with slower media.
• Use the
no spanning-tree mst cost
command to specify auto-configuration
mode.
• Path cost takes precedence over interface priority.
Example
Related Commands
spanning-tree mst port-priority (4-212)
25. Use the spanning-tree pathcost method command on page 4-201 to set the path cost method.
Console(config)#interface ethernet ethernet 1/5
Console(config-if)#spanning-tree mst 1 cost 50
Console(config-if)#
Summary of Contents for 8126PL2-F
Page 1: ...MANAGEMENT GUIDE ta TigerSwitchTM 10 100 1000 L2 Lite SMB PoE Gigabit Switch SMC8126PL2 F ...
Page 2: ......
Page 6: ...vi ...
Page 22: ...Contents xxii ...
Page 26: ...Tables xxvi ...
Page 48: ...Initial Configuration 2 10 2 ...
Page 117: ...User Authentication 3 69 3 Web Click Security AAA Summary Figure 3 43 AAA Accounting Summary ...
Page 590: ...Command Line Interface 4 302 4 ...
Page 604: ...Glossary Glossary 8 ...
Page 612: ...Index 8 Index ...
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Page 614: ...149100000023A R01 SMC8126PL2 F ...