Figure 6.3: Fiber Cross Connection
SwitchA(Config-If-Ethernet1/1)#exit
SwitchA(config)#interface ethernet 1/2
SwitchA(Config-If-Ethernet1/2)#uldp enable
Switch B configuration sequence:
SwitchB(config)#uldp enable
SwitchB(config)#interface ethernet1/3
SwitchB(Config-If-Ethernet1/3)#uldp enable
SwitchB(Config-If-Ethernet1/3)#exit
SwitchB(config)#interface ethernet 1/4
SwitchB(Config-If-Ethernet1/4)#uldp enable
As a result, port g1/1, g1/2 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 Ethernet1/1 need
to be shutted down!
%Oct 29 11:09:50 2007 Unidirectional port Ethernet1/1 shut down!
%Oct 29 11:09:50 2007 A unidirectional link is detected! Port Ethernet1/2 need
to be shutted down!
%Oct 29 11:09:50 2007 Unidirectional port Ethernet1/2 shutted down!
Port g1/3, and port g1/4 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 Ethernet1/3 need
to be shutted down!
%Oct 29 11:09:50 2007 Unidirectional port Ethernet1/3 shutted down!
%Oct 29 11:09:50 2007 A unidirectional link is detected! Port Ethernet1/4 need
to be shutted down!
%Oct 29 11:09:50 2007 Unidirectional port Ethernet1/4 shutted down!
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