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awk 'FNR == NR {T[$2] = $0; next} $0 = $0 "|" (T[$NF]?T[$NF]:"Notfound")' FS="," file1 file2
10.62.75.120, portIndex: 247 portName: slot12...

No surprise if you change the structure of your files. Get rid of the FS=" " and report back.

What input has changed? What should the output look like?
Give he whole picture!

When writing ROW you mean column or field, don't you? How about
awk 'FNR == NR {T[$2] = $0; next} $0 = $0 "|" (T[$NF]?T[$NF]:"Notfound")' FS="," file1 FS=" " file2
Switch1, 381 12 45 F-Port...

First thing that caught my eyes is there's no field 10 in any file.