LuxCom OM1004 Скачать руководство пользователя страница 6

Rapid Spanning Tree Protocol (RSTP)

Rapid Spanning Tree Protocol (RSTP)

When a connection between  Ethernet switches exists, making a second connection 
directly or indirectly (through a third switch) will disrupt the Ethernet network unless the 
Rapid Spanning Tree Protocol (RSTP) is active. The RSTP will disable all redundant paths, 
and transmit data only over the preferred path;  if the preferred path fails, the next port on 
the priority list will become enabled.  When the OM1004 is in RSTP mode, and Hardware 
(default) mode, and has redundant paths, the data path with the lowest cost (highest 
throughput) becomes active, and the other path(s) are blocked.  When alternate paths have 
the same cost, the lowest number port (including the RJ45 port) is the preferred path.  

Alternately the serial Configuration Port on the OM1004 can be used to set the priority of 
the ports (SW2 up), however this is best avoided unless the user is familiar with RSTP.  

The following figure shows an an example of an acceptable OM1004 spanning tree 
configuration when in the  default plug-and-play mode.  Note that each port connects to 
one other spanning tree port.

The following figure shows an unacceptable spanning tree configuration when in the 
default plug-and-play mode.  Note that port 2 of switch A connects to switch B and C.

If it is desired to use the above topology, the OM1004 should be set for software 
configuration, and configuration menu item 

e   Set port admin p2p MAC 

should be set to 

NO (the default of AUTO usually becomes YES).   This will allow the above topology at the 
expense of a longer recovery time when the topology changes.

3   

1

2

3

1

2

3

1

2

3

A

B

C

No Spanning Tree

1

2

3

1

2

3

1

2

3

1

2

3

4

5

6

D

A

B

C

Содержание OM1004

Страница 1: ...0BASE X optical ports One 10 100 1000BASE T port With Rapid Spanning Tree OPERATING MANUAL REV 2 5 April 26 2013 102 WALGREEN ROAD OTTAWA ONTARIO K0A 1L0 Telephone 613 831 7777 Fax 613 831 7778 www lu...

Страница 2: ...tors 1 Dip Switches 2 Rapid Spanning Tree Protocol RSTP 3 Configuration Interface 4 OM1004 Main Menu 4 The main menu is shown below 4 Bridge RSTP Menu 6 Software Menu 7 Specifications 9 Ordering Infor...

Страница 3: ...ry Revision 1 0 Initial release Revision 2 0 new format Revision 2 1 Revision 2 2 Revision 2 3 Revise ALARM LED description Revision 2 4 Update spec for power supply Revision 2 5 auxiliary power suppl...

Страница 4: ...NK has been established with a remote Ethernet port Flashing when data is being transmitted or received STP Spanning Tree Green when the port is forwarding packets in RSTP mode Yellow when the port is...

Страница 5: ...function in its default settings 3 Unused 4 Unused 5 Port alarm 1 Up if port 1 electrical port is a required port See Alarm in the Indicator section 6 Port alarm 2 Up if port 2 optical port is a requ...

Страница 6: ...erred path Alternately the serial Configuration Port on the OM1004 can be used to set the priority of the ports SW2 up however this is best avoided unless the user is familiar with RSTP The following...

Страница 7: ...e user to configure the RSTP and monitor the Ethernet statistics its use is optional The supplied cable must be connected between the serial port of a PC and ths interface A terminal emulation program...

Страница 8: ...w port packet statistics Esc Back 1 Ethernet Status Port 1 2 3 4 Switch Port P1 P4 P6 P5 Type Electrical Optical Optical Optical Media Copper Fiber Fiber Fiber Link Good Yes No No No Auto Negotiation...

Страница 9: ...each item 1 Show bridge status Shows status which applies to all ports on the OM1004 2 Show port status Shows status which applies to individual ports on the OM1004 3 Set default configuration Restor...

Страница 10: ...C which is normally full duplex f Port mode check Causes the bridge to transmit RSTP BPDUs in order to test the hypothesis that non RSTP bridges have been removed from the LAN connected to the port an...

Страница 11: ...tart the Xmodem transfer the user must select the Xmodem protocol and the upload file e g using HyperTerminal s Transfer Send File menu option The OM1004 send C s for thirty seconds This is an indicat...

Страница 12: ...km SC or ST BD 1550 nm TX laser 9 125 m 9 dBm 20 dBm 20 km SC or ST S803 1550 nm laser 9 125 m 0 dBm 23 dBm 80 km SC or ST S1003 1550 nm laser 9 125 m 0 dBm 32 dBm 100 km SC Electrical Data I O level...

Страница 13: ...OT LIABLE FOR CONSEQUENTIAL DAMAGES Repackaging For Shipment Before returning the item paperwork indicating the name department company and telephone number of the sender model and serial number of th...

Отзывы: