Type "Show cable modem " and MAC ID of that modem you will get detail of that modem for which U/S cable modem is connected.. In following example,cable modem is connected with upstream U2 :
Trax_CMTS#show cable modem 0018.680b.d3e6
DS/US Prim Online Timing Rec CPE IP address MAC address DOC
Interface SID state offset power
C1/0/U2.0 124 online 1763 0.0 1/1 10.122.0.10 0018.680b.d3e6 D1.0
for summary of cable modem, type "Show cable modem summary"
Type "Show cable modem " and MAC ID of that modem you will get detail of that modem for which U/S cable modem is connected.. In following example,cable modem is connected with upstream U2 :
Trax_CMTS#show cable modem 0018.680b.d3e6
DS/US Prim Online Timing Rec CPE IP address MAC address DOC
Interface SID state offset power
C1/0/U2.0 124 online 1763 0.0 1/1 10.122.0.10 0018.680b.d3e6 D1.0
for summary of cable modem, type "Show cable modem summary"
I hope u got it now..