PLANET XGS3-24042 - Manual (Page 102)

10-5
connected and works normally, but the data link layer is abnormal. ULDP can discover and disable this kind of
error state of link. The final result is that port g1/0/1, g1/0/2 of SWITCH A and port g1/0/3, g1/0/4 of SWITCH B
are all shut down by ULDP. Only when the connection is correct, can the ports work normally (won’t be shut
down).
Switch A configuration sequence:
SwitchA(config)#uldp enable
SwitchA(config)#interface ethernet 1/0/1
SwitchA (Config-If-Ethernet1/0/1)#uldp enable
SwitchA (Config-If-Ethernet1/0/1)#exit
SwitchA(config)#interface ethernet1/0/2
SwitchA(Config-If-Ethernet1/0/2)#uldp enable
Switch B configuration sequence:
SwitchB(config)#uldp enable
SwitchB(config)#interface ethernet1/0/3
SwitchB(Config-If-Ethernet1/0/3)#uldp enable
SwitchB(Config-If-Ethernet1/0/3)#exit
SwitchB(config)#interface ethernet1/0/4
SwitchB(Config-If-Ethernet1/0/4)#uldp enable
As a result, port g1/0/1, g1/0/2 of SWITCH A are all shut down by ULDP, and there is notification information
on the CRT terminal of PC1.
%Oct 29 11:09:50 2007 A unidirectional link is detected! Port Ethernet1/0/1 need to be shutted down!
%Oct 29 11:09:50 2007 Unidirectional port Ethernet1/0/1 shut down!
%Oct 29 11:09:50 2007 A unidirectional link is detected! Port Ethernet1/0/2 need to be shutted down!
%Oct 29 11:09:50 2007 Unidirectional port Ethernet1/0/2 shutted down!
Port g1/0/3, and port g1/0/4 of SWITCH B are all shut down by ULDP, and there is notification information on
the CRT terminal of PC2.
%Oct 29 11:09:50 2007 A unidirectional link is detected! Port Ethernet1/0/3 need to be shutted down!
%Oct 29 11:09:50 2007 Unidirectional port Ethernet1/0/3 shutted down!
%Oct 29 11:09:50 2007 A unidirectional link is detected! Port Ethernet1/0/4 need to be shutted down!
%Oct 29 11:09:50 2007 Unidirectional port Ethernet1/0/4 shutted down!
10.4 ULDP Troubleshooting
Configuration Notice:
 In order to ensure that ULDP can discover that the one of fiber ports has not connected or the ports are
incorrectly cross connected, the ports have to work in duplex mode and have the same rate.
 If the automatic negotiation mechanism of the fiber ports with one port misconnected decides the
working mode and rate of the ports, ULDP won’t take effect no matter enabled or not. In such situation,