User manual
40
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（
Figure 6.6.14
）
Rapid Spanning Tree of concepts:
Switch priority
：
As the bridge priority
，
the bridge priority and bridge MAC address combine bridge ID
，
the smallest ID bridge will become the root bridge on the network.
Polling interval
：
How often send BPDU packet at one time.
Forwarding delay
：
The port state of switch remains a forward delay time over the listening and
learning.
The maximum aging time
：
After one switch receive a packet from other switches, how long the
packet is valid.
The port concepts of RSTP:
Port path overhead
：
Port link cost compared with port priority and port ID.
Port priority
：
Port priority among the net bridge compared with port priority and port ID
Point to point network connection
：
Directly connect with switches port each other, the port is P2P,
which adopted negotiation mechanism, RSTP can achieve port state rapid conversion RSTP
Directly connect terminal
：
Connect the edge of network switch with terminal devices with
configuration Edge port
，
which can achieve port state rapid conversion without the processing
Discarding
，
Learning
，
Forwarding
Don’t join RST structure
：
Don‟t participate in RSTP running
Four situation of RST
：
Blocking
：
Can receive BPDU packets to change the listening state, if the period did not receive
BPDU.
Listening
：
Can receive packets, after the connection to it, switches stay max age=20s in the blocking
，
so judge whether switch port can become root port or designated port
，
the port state will convert
listening(the state remains 15 ms) if it works, receive and forward packets during this time to achieve the
