san switch loopback test
1、connect the SFP Rx to Tx via one cable.
switchshow :
1 1 id N4 Online Loopback->Port 1
2、connect port1 SFP Tx to port2 Rx; and connect port1 Rx to port2 Tx.via 2cable
switchshow:
Area Port Media Speed State Proto
=====================================
0 0 id N4 No_Light Disabled (Persistent)
1 1 id N4 Online Loopback->Port 2
2 2 id N4 Online Loopback->Port 1
so ,we can use this skill to test a SFP or 2 port when we just have only 1 machine.
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