Edge-Core ECS3510-10PD, Management Manual

Page: 1091 / 1494

C
HAPTER
33
| Spanning Tree Commands
– 1091 –
◆
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.
E
XAMPLE
Console(config)#interface Ethernet 1/5
Console(config-if)#spanning-tree mst 1 cost 50
Console(config-if)#
R
ELATED
C
OMMANDS
spanning-tree mst port-priority (1091)
spanning-tree
mst port-priority
This command configures the interface priority on a spanning instance in
the Multiple Spanning Tree. Use the no form to restore the default.
S
YNTAX
spanning-tree mst instance-id port-priority priority
no spanning-tree mst instance-id port-priority
instance-id - Instance identifier of the spanning tree.
(Range: 0-4094)
priority - Priority for an interface. (Range: 0-240 in steps of 16)
D
EFAULT
S
ETTING
128
C
OMMAND
M
ODE
Interface Configuration (Ethernet, Port Channel)
C
OMMAND
U
SAGE
◆
This command defines the priority for the use of an interface in the
multiple spanning-tree. If the path cost for all interfaces on a switch are
the same, the interface with the highest priority (that is, lowest value)
will be configured as an active link in the spanning tree.
◆
Where more than one interface is assigned the highest priority, the
interface with lowest numeric identifier will be enabled.
E
XAMPLE
Console(config)#interface Ethernet 1/5
Console(config-if)#spanning-tree mst 1 port-priority 0
Console(config-if)#