Table 12. Relationship between IEEE 802.1D and IEEE 802.1w port states
IEEE 802.1D port | Admin. bridge | MAC operational | IEEE 802.1w port | Active topology port | |
state | port state | state | role | ||
| |||||
|
|
|
|
| |
Listening | Enabled | True | Discarding | Included, root or | |
designated | |||||
|
|
|
| ||
|
|
|
|
| |
Learning | Enabled | True | Learning | Included, root or | |
designated | |||||
|
|
|
| ||
|
|
|
|
| |
Forwarding | Enabled | True | Forwarding | Included, root or | |
designated | |||||
|
|
|
| ||
|
|
|
|
|
Setting user-changeable STP parameters
The next table shows the default spanning-tree configuration.
Table 13. Default STP parameters
Feature | Default value |
|
|
Enable state | STP enabled for all ports |
|
|
Port priority | 128 |
|
|
Port cost | auto |
|
|
Bridge priority | 32768 |
|
|
The factory default settings are compatible with the majority of installations, and it is advisable to keep the default settings as set at the factory unless it is absolutely necessary to change them. The
Priority You can set a priority for the bridge from 0 to 65535. A value of 0 indicates the highest priority.
Hello Time The hello time can be from 1 to 10 seconds. This is the interval between two transmissions of BPDU packets sent by the root bridge to tell all other bridges that it is indeed the root bridge. If you set a hello time for your bridge, and it is not the root bridge, the set hello time will be used if and when your bridge becomes the root bridge.
/NOTE
The hello time cannot be longer than the Max. Age. Otherwise, a configuration error will occur.
Max. Age The Max. Age can be from 6 to 40 seconds. At the end of the Max. Age, if a BPDU has still not been received from the root bridge, your bridge will start sending its own BPDU to all other bridges for permission to become the root bridge. If your bridge has the lowest bridge identifier, it will become the root bridge.
Forward Delay
The Forward Delay can be from 4 to 30 seconds. For IEEE 802.1D operation this is the time that any port on the bridge spends in the learning state while moving from
Intel® Blade Server Ethernet Switch Module IXM5414E | 261 |