User manual
Page 39
Forwarding delay
：
the port state of switch remain 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.
RSTP switch port states:
1.
Blocking
- A port that would cause a switching loop if it were active. No user data is sent or
received over a blocking port, but it may go into forwarding mode if the other links in use fail and the
spanning tree algorithm determines the port may transition to the forwarding state. BPDU data is
still received in blocking state. Prevents the use of looped paths.
2.
Listening
- The switch processes BPDUs and awaits possible new information that would cause
it to return to the blocking state. It does not populate the MAC address table and it does not forward
frames.
3.
Learning
- While the port does not yet forward frames it does learn source addresses from
frames received and adds them to the filtering database (switching database). It populates the MAC
Address table, but does not forward frames.
4.
Forwarding
- A port receiving and sending data, normal operation. RSTP still monitors incoming
BPDUs that would indicate it should return to the blocking state to prevent a loop.
The example of Configuration: The priority of network bridge is “32768”
，
If there did not have
network ID less than itself, itself is root network bridge. There did not have same network ID in network.
Every 2 seconds, the network bridge will transmit BPDU message to all appoint port. If did not receive
BPDU message more than 20 seconds, it realized port invalid, will calculate the status of network
bridge again. Each status exchange for each other if need to transmit, need to wait 15 seconds
6.7 Access Profile
6.7.1 Login Settings
Enterprise usually required two different person to monitor device and manage system/ network. The
authority need to separate. Monitor person was in charge of monitor work, system/network person was
in charge of system/work management. The switch provided
classification management:
Administrator authority and Observer authority. Observer just had authority to check the
status of switch. Administrator had the authority to configure the parameters of the switch.
Index
User index indicates which group of users. There are three user indexes in drop-down list.
Access level:
administrator
：
have the right to check and configure all settings
observer
：
have the right to check all settings merely
Login name
The identity of visitor with the letter combination is no more than 16 bytes