Today came across configurationDHCP relayThe problem，Suddenly I found that I had actually not noticed，Even sometimes do not know how to engage，And later I had to Google it very awkward ......，Now recorded as follows：
I was not on the map topology，Simple words to describe：
R1(f0/1)————-(f0/1)R2(f0/0)——S1——PC0
[……]