Hi all, Here is the setup: I have a PoE switch, which is connected to 2 other PoE switches. All switches are cat 3560 switches (WS-C3560G-48PS) Biometric devices (Finger-printers) connect on to one port of each downlink switches (there are 2 downlink switches) I have disabled inline power on all the ports of these 3 switches, as there are no PoE devices connected The uplink cables for the downlink switches are CAT6 and under 20m. All access ports are marked as portfast (including the biometric device's port) IOS: 12.2(35)SE5 (IP Services)
Before the inline power was disabled, one of the switches displayed an inline power error for the biometric device's port, which on further checks with cisco.com, pointed to the bug CSCeb24148 (related to Electro-static Discharge). Since then, I have upgraded the IOS, as per the recommendations. The problem: Before inline power was disabled, the biometric device port went down, without any logs (apart from the inline power error, which was generated only once in multiple port checks). Also, the reliability of the port goes down to 254/255. After the IOS upgrade, the switch no longer throws up the inline power issue. As a precaution, I disabled inline power on all ports using the 'power inline never' command. Still, the biometric device disconnected. Post that, the following was done: Cabling was changed/verified Trunking was disabled (as this was a cascade environment with no vlans, it did not make any difference - all 3 switches belong to a single broadcast domain) Various duplex/speed combinations were tested Non-PoE switches were tested in standalone modes, and they did not disconnect the biometric device. Non-PoE switches were tested in standalone modes, and in the same cabling closet and they did not disconnect the biometric device (to verify static charges issues) When cascaded with PoE switches, the non-PoE switched disconnected the biometric device! The switches were configured to NOT errdisable a port on detecting a loopback None of the above helped. Now, I get the following logs on the non-PoE switch (3560), before the biometric device's port disconnects: 04:19:26: ILP Start PHY Cisco IP phone detection ( Fa0/48 ) Okay 04:19:27: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet0/48, changed state to down 04:19:28: %LINK-3-UPDOWN: Interface FastEthernet0/48, changed state to down I fail to understand as to why the non-PoE switch is trying to detect a cisco IP phone, on a port to which the biometric device connects (port fa0/48). This is inspite the fact that the uplink switch has been configured to disable inline power on all ports, including the downlink port. Even, the other downlink switch is configured to disable inline power. Question: Can anyone kindly help me to understand the above behaviour? Question 2: How can I disable the detection of the Cisco IP phone on any PoE/non-PoE switch? Another thing that I am unable to figure out is the possibility of static charge generation in the cabling closet. -- Warm regards, Amol Sapkal ------------------------------------------------------------------- "When I'm not in my right mind, my left mind gets pretty crowded" ------------------------------------------------------------------- _______________________________________________ cisco-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
