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C H A P T E R 3 Standard Configuration
4 Click the required parameter.
5 Type the percentage of errors or runts.
6 Click OK.
Spanning Tree
Purpose You can change the:
• Priority given to the switch
• Maximum length of time information is retained by the switch
• Time between transmitted Configuration BPDUs
• Time the switch spends in the Listening and Learning states
Warning when using
VLANs
It is important to be aware of problems that may arise when using
Spanning Tree and VLANs. The Spanning Tree can use alternative
paths (such as different ports) to get messages to their destination.
The diagram above, shows two switches. On the left, we see the two
switches connected and the ports are grouped in two VLANs: A and
B. On the right, we have enabled STP; STP blocks the path between
X and Z (to avoid looping) and, therefore, destroys the VLAN setup
(because VLAN B needs these ports to receive messages).
Why change these from
their defaults?
The switch is delivered with Spanning Tree default values set to those
recommended by the IEEE 802.1d standard. These values are conser-
vative worst-case estimates for LANs consisting of a large number of
switches. Therefore, changing these default values may improve the
performance of your network.
TXTX TX TX TX TX TX TXRXRX RX RX RX RX RX RX
Power
Intel Express
550F Routing
Switch
Status
Temperature
RPS
123 87654
Reset
Console
9600-8-N-1
SlotBSlotA
Blink
Solid
Solid
Off
Activity
Link
100Mbps
10Mbps
Collision
Disabled
Fullduplex
Halfduplex
LEDs
LEDs
Green
Green
Orange
Orange
PortStatus
TXTX TX TX TX TX TX TXRXRX RX RX RX RX RX RX
Power
Intel Express
550F Routing
Switch
Status
Temperature
RPS
123 87654
Reset
Console
9600-8-N-1
SlotBSlotA
Blink
Solid
Solid
Off
Activity
Link
100Mbps
10Mbps
Collision
Disabled
Fullduplex
Halfduplex
LEDs
LEDs
Green
Green
Orange
Orange
PortStatus
TXTX TX TX TX TX TX TXRXRX RX RX RX RX RX RX
Power
Intel Express
550F Routing
Switch
Status
Temperature
RPS
123 87654
Reset
Console
9600-8-N-1
SlotBSlotA
Blink
Solid
Solid
Off
Activity
Link
100Mbps
10Mbps
Collision
Disabled
Fullduplex
Halfduplex
LEDs
LEDs
Green
Green
Orange
Orange
PortStatus
TXTX TX TX TX TX TX TXRXRX RX RX RX RX RX RX
Power
Intel Express
550F Routing
Switch
Status
Temperature
RPS
123 87654
Reset
Console
9600-8-N-1
SlotBSlotA
Blink
Solid
Solid
Off
Activity
Link
100Mbps
10Mbps
Collision
Disabled
Fullduplex
Halfduplex
LEDs
LEDs
Green
Green
Orange
Orange
PortStatus
Switch 2
Switch 1
B
B
A
A
WX
Y
Z
VLAN STP
VLAN
1685
500.book Page 55 Thursday, September 2, 1999 1:44 PM