Spanning Tree Protocols - ZyXEL Communications MSC1000G User Manual

Chapter 13 Switch Screens
Table 275 Switch Setup VlanPri
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13.11 Spanning Tree Protocols

The switch supports Spanning Tree Protocol (STP), Rapid Spanning Tree Protocol (RSTP) and
Multiple Spanning Tree Protocol (MSTP) as defined in the following standards.
• IEEE 802.1D Spanning Tree Protocol
• IEEE 802.1w Rapid Spanning Tree Protocol
• IEEE 802.1s Multiple Spanning Tree Protocol
13.11.1 STP and RSTP
RSTP adds rapid reconfiguration capability to STP. The switch supports RSTP and the earlier STP.
RSTP and STP detect and break network loops and provide backup links between switches, bridges
or routers. They allow a device to interact with other RSTP or STP-aware devices in your network to
ensure that only one path exists between any two stations on the network. The switch uses RSTP
by default but can still inter-operate with STP switches (although without RSTP's benefits).
The root bridge is the base of the spanning tree; it is the bridge with the lowest identifier value
(MAC address). Path cost is the cost of transmitting a frame onto a LAN through that port. It is
assigned according to the speed of the link to which a port is attached. The slower the media, the
higher the cost - see the following tables.
Table 276 STP Path Costs
LINK SPEED
4Mbps
10Mbps
16Mbps
100Mbps
1Gbps
10Gbps
Table 277 MSTP/RSTP Path Costs
LINK SPEED
<= 100 Kbps
1 Mbps
10 Mbps
100 Mbps
1 Gbps
10 Gbps
100 Gbps
522
DESCRIPTION
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Click Cancel to begin configuring this screen afresh.
RECOMMENDED VALUE
250
100
62
19
4
2
RECOMMENDED VALUE
200 000 000
20 000 000
2 000 000
200 000
20 000
2000
200
RECOMMENDED RANGE
100 to 1000
50 to 600
40 to 400
10 to 60
3 to 10
1 to 5
RECOMMENDED RANGE
200 000 000 to 200 000 000
2 000 000 to 200 000 000
200 000 to 20 000 000
20 000 to 2 000 000
2000 to 200 000
200 to 20 000
20 to 2000
Management Switch Card User's Guide
ALLOWED RANGE
1 to 65535
1 to 65535
1 to 65535
1 to 65535
1 to 65535
1 to 65535
ALLOWED RANGE
1 to 200 000 000
1 to 200 000 000
1 to 200 000 000
1 to 200 000 000
1 to 200 000 000
1 to 200 000 000
1 to 200 000 000