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Configuring Switch Information 327
•
BPDU Handling
— Determines 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 field values are:
–
Filtering
— Filters BPDU packets when spanning tree is disabled on an interface. This is the
default value.
–
Flooding
— Floods BPDU packets when spanning tree is disabled on an interface.
•
Path Cost Default Values
— Specifies the method used to assign default path costs to STP ports.
The possible field values are:
–
Short
— Specifies 1 through 65,535 range for port path costs. This is the default value.
–
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)
— Specifies 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)
— Specifies the device Hello Time. The Hello Time indicates the amount of time
in seconds a root bridge waits between configuration messages. The default is 2 seconds.
•
Max Age (6-40
) — Specifies the device Maximum Age Time. The Maximum Age Time indicates the
amount of time in seconds a bridge waits before sending configuration messages. The default max age
is 20 seconds.
•
Forward Delay (4-30)
— Specifies the device forward delay time. The Forward Delay Time indicates
the amount of time in seconds a bridge remains in a listening and learning state before forwarding
packets. The default is 15 seconds.
Designated Root
•
Bridge ID
— Identifies the Bridge priority and MAC address.
•
Root Bridge ID
— Identifies the Root Bridge priority and MAC address.
•
Root Port
— Indicates the port number that offers the lowest cost path from this bridge to the Root
Bridge. It is significant when the Bridge is not the Root.
Interface
Long Short
LAG
20,000 4
1000 Mbps
20,000 4
100 Mbps
200,000 19
10 Mbps
2,000,000 100