| Parameter | Description |
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| STP Status | Use the | |
| STP Version | Use the | |
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| three choices: | |
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| STP – Select this parameter to set the Spanning Tree Protocol (STP) globally on the switch. | |
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| RSTP – Select this parameter to set the Rapid Spanning Tree Protocol (RSTP) globally on the Switch. | |
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| MSTP – Select this parameter to set the Multiple Spanning Tree Protocol (MSTP) globally on the Switch. | |
| Hello Time: | The Hello Time can be set from 1 to 10 seconds.This is the interval between two transmissions of BPDU | |
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| packets sent by the Root Bridge to tell all other switches that it is indeed the Root Bridge.This field will only | |
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| appear here when STP or RSTP is selected for the STP Version. For MSTP, the Hello Time must be set on a port | |
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| per port basis. See the MST Port Settings section for further details. | |
| Max Age: (6 - 40 sec) | The Max Age may be set to ensure that old information does not endlessly circulate through redundant | |
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| paths in the network, preventing the effective propagation of the new information. Set by the Root Bridge, this | |
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| value will aid in determining that the Switch has spanning tree configuration values consistent with other | |
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| devices on the bridged LAN. If the value ages out and a BPDU has still not been received from the Root Bridge, | |
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| the Switch will start sending its own BPDU to all other switches for permission to become the Root Bridge. If | |
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| it turns out that your switch has the lowest Bridge Identifier, it will become the Root Bridge.The user may | |
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| choose a time between 6 and 40 seconds.The default value is 20. | |
| Forward Delay: (4 – 30 sec) | The Forward Delay can be from 4 to 30 seconds.Any port on the Switch spends this time in the listening | |
| Max Hops | state while moving from the blocking state to the forwarding state. | |
| Used to set the number of hops between devices in a spanning tree region before the BPDU (bridge protocol | ||
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| data unit) packet sent by the Switch will be discarded. Each switch on the hop count will reduce the hop count | |
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| by one until the value reaches zero.The Switch will then discard the BDPU packet and the information held for | |
| TX Hold Count | the port will age out.The user may set a hop count from 1 to 20.The default is 20. | |
| Used to set the maximum number of Hello packets transmitted per interval.The count can be specified from 1 | ||
| Forwarding BPDU | to 10.The default is 3. | |
| This field can be Enabled or Disabled.When Enabled, it allows the forwarding of STP BPDU packets from other | ||
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| network devices.The default is Enabled. | |
Click Apply to implement changes made. |
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Note: The Hello Time cannot be longer than the Max.Age. Otherwise, a configuration error will occur. Observe the following formulas when setting the above parameters:
Max.Age ≤ 2 x (Forward Delay - 1 second) Max.Age ≤ 2 x (Hello Time + 1 second)
MST Configuration Table
The following screens in the MST Configuration Table window allow the user to configure a MSTI instance on the Switch.These settings will uniquely identify a multiple spanning tree instance set on the Switch.The Switch initially possesses one CIST or Common Internal Spanning Tree of which the user may modify the parameters for but cannot change the MSTI ID for, and cannot be deleted.To view the Current MST Configuration Identification window, click Configuration > Spanning Tree > MST Configuration Table:
Figure 6- 24. Current MST Configuration Identification window
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