User's Manual

Table Of Contents
219
Users Manual of CS-6306R
Command Purpose
spanning-tree mode rstp Enables RSTP
no spanning-tree mode Returns STP to default mode (SSTP)
19.1.6.2 Configuring the Switch Priority
You can configure the switch priority and make it more likely that a standalone switch or a switch in the stack
will be chosen as the root switch.
Follow these steps to configure the switch priority:
Follow these configurations in the global configuration mode:
Command Purpose
spanning-tree rstp priorityvalue
Modifies rstp priority value.
no spanning-tree rstp priority Returns rstp priority to default value.
If the priority of all bridges in the whole switch network uses the same value, then
the bridge with the least MAC address will be chosen as the root bridge. In the
situation when the RSTP protocol is enabled, if the bridge priority value is modified,
it will cause the recalculation of spanning tree.
The bridge priority is configured to 32768 by default.
19.1.6.3 Configuring the Forward Delay Time
Link failures may cause network to recalculate the spanning tree structure. But the latest configuration
message can no be conveyed to the whole network. If the newly selected root port and the specified port
immediately start forwarding data, this may cause temporary path loop. Therefore the protocol adopts a kind
of state migration mechanism. There is an intermediate state before root port and the specified port starting
data forwarding, after the intermediate state passing the Forward Delay Time, the forward state begins. This
delay time ensures the newly configured message has been conveyed to the whole network. The Forward
Delay characteristic of the bridge is related to the network diameter of the switch network. Generally, the
grater the network diameter, the longer the Forward Delay Time should be configured.
Follow these configurations in the global configuration mode:
Command Purpose
spanning-tree rstp forward-time value
Configures Forward Delay
no spanning-tree rstp forward-time Returns Forward Delay Time to default
value (15s).
If you configure the Forward Delay Time to a relatively small value, it may leads to a
temporary verbose path. If you configure the Forward Delay Time to a relatively big
value, the system ma
y not resume connecting for a long time. We recommend user
to use the default value.
The Forward Delay Time of the bridge is 15 seconds.