Dell PowerEdge VRTX - Manual (Page 298)

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FILE LOCATION: C:\Users\gina\Desktop\Checkout_new\Dell Plasma\User
Guide\Plasma_UGSwitching_STP.fm
D E L L C O N F ID E N T IA L – P R E L IM I N A RY 4 / 1 8 /1 3 - F O R P R O O F O N LY
• Designated — This LAG is the interface through which the
bridge is connected to the LAN, which provides the lowest cost
path from the LAN to the Root Bridge.
• Alternate — This LAG provides an alternate LAG to the root
switch from the root interface.
• Backup — This LAG provides a backup path to the designated
port. Backup ports occur only when two ports are connected in a
loop by a point-to-point link. Backup ports also occur when a LAN
has two or more connections connected to a shared segment.
• Disabled — This LAG is not participating in the Spanning Tree.
– Path Cost (1-200000000) — Enter the amount the LAG contributes
to the root path cost. The path cost is adjusted to a higher or lower
value, and is used to forward traffic when a path is being rerouted.
The path cost has a value of 1 to 200000000.
– Default Path Cost — Check for the device to use the default path
cost.
– Priority — Select the priority value of the LAG. The priority value
influences the LAG choice when a bridge has looped ports. The
priority value is given in steps of 16.
– Designated Bridge ID — Displays the priority and the MAC address
of the designated bridge.
– Designated Port ID — Displays the ID of the selected interface.
– Designated Cost — Displays the cost of the port participating in the
STP topology. Ports with a lower cost are less likely to be blocked if
STP detects loops.
– Forward Transitions — Displays the number of times the LAG State
has changed from the Forwarding state to a Blocking state.
Defining STP LAG Settings Using CLI Commands
For information about CLI commands for defining STP LAG settings, see
Table 11-2.