Dell PowerConnect 55xx Systems User Guide 439
FILE LOCATION: C:\Users\gina\Desktop\Checkout_new\Maintenance Projects\Dell
Contax\CxUGSwitching_STP.fm
DELL CONFIDENTIAL – PRELIMINARY 9/11/12 - FOR PROOF ONLY
–
BPDU Handling
— Select how Bridge Protocol Data Unit (BPDU)
packets are managed when STP is disabled on the port/device. BPDUs
are used to transmit spanning tree information. The possible options
are:
•
Filtering
— Filter BPDU packets when spanning tree is disabled
on an interface.
•
Flooding
— Flood BPDU packets when spanning tree is disabled
on an interface.
–
Path Cost Default Values
— Select the method used to assign default
path costs to STP ports. The possible options are:
•
Short
— Specifies 1 through 65,535 range for port path costs.
•
Long
— Specifies 1 through 200,000,000 range for port path
costs.
The default path costs assigned to an interface vary according to the
selected method:
Bridge Settings
–
Priority (0-61440 in steps of 4096)
— Enter the bridge priority value.
When switches or bridges are running STP, each is assigned a priority.
After exchanging BPDUs, the device with the lowest priority value
becomes the Root Bridge. The default value is 32768. The port
priority value is provided in increments of 4096. For example, 4096,
8192, 12288, etc.
–
Hello Time (1-10)
— Check to use the device Hello Time, which is
the interval of time in seconds that a root bridge waits between
configuration messages. Enter a value.
–
Max Age (6-40
) — Check to use device Maximum Age Time, which is
the time interval in seconds that a bridge waits before sending
configuration messages. Enter a value.
Interface Long Cost Short Cost
LAG 20,000 4
1000 Mbps 20,000 4
100 Mbps 200,000 19
10 Mbps 2,000,000 100
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