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lenins.akm
Beginner

Cisco 3750 Switch connected to a Cisco 1200 AP. Using PoE. Getting Line Protocol down logs in switch. What could be the reason?

The setup is as follows

Cisco 3750 gig port is connected to Cisco 1200 AP Fa port. totally 3 APs are connected. All APs use PoE.

The problem is

I am getting the following logs in switch.  But there is no corresponding logs in AP. I am getting theses logs very frequently for 1 AP and seldom for another AP. no log for third AP.

Jun  2 15:42:42 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/14, changed state to up
Jun  2 15:46:39 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/14, changed state to down
Jun  2 15:46:41 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/14, changed state to up
Jun  2 15:50:46 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/14, changed state to down
Jun  2 15:50:48 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/14, changed state to up
Jun  2 15:54:37 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/14, changed state to down
Jun  2 15:54:39 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/14, changed state to up
Jun  2 16:01:07 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/14, changed state to down
Jun  2 16:01:09 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/14, changed state to up
Jun  2 16:05:13 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/14, changed state to down
Jun  2 16:05:15 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/14, changed state to up
Jun  2 16:14:12 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/14, changed state to down
Jun  2 16:14:14 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/14, changed state to up
Jun  2 16:20:53 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/14, changed state to down
Jun  2 16:20:55 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/14, changed state to up
Jun  2 16:21:01 IST: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/14, changed state to down
Jun  2 16:21:02 IST: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/14, changed state to down
Jun  2 16:21:35 IST: %LINK-3-UPDOWN: Interface GigabitEthernet1/0/14, changed state to up

Please suggest how to solve this.

2 REPLIES 2
glen.grant
Advisor

  check cabling for layer 1 issues .   Use the TDR function in the 3750 to check drop to AP .

Thanks a lot for your reply glen

When I run the cable diagnostics, I get the following results,

Interface Speed Local pair Pair length        Remote pair Pair status

--------- ----- ---------- ------------------ ----------- --------------------

Gi1/0/14  100M  Pair A     3    +/- 4  meters Pair A      Normal

                Pair B     3    +/- 4  meters Pair B      Normal

                Pair C     0    +/- 4  meters Pair C      Open

                Pair D     3    +/- 4  meters Pair D      Normal

Does this result indicates any cable issue?