Hi all, We're having an odd issue with a 3750 that's running as the core switch at one of our sites. It's been fine for years; suddenly, this week, it's decided that some of it's interfaces should reset randomly, disrupting access to staff phones and PCs in the buildings at the other end.
It's in a stack (as master) with a 3750-48. All interfaces are populated with 1000SX SFP modules (all genuine Cisco). All edge switches are 3560s. None of the edge switches show anything in the log about the link loss (it's only about 3 seconds) but the core switch shows this: Date Time Priority Hostname Message 02-05-2009 16:30:44 Local7.Notice 10.2.115.182 640: 000609: Feb 5 16:30:44: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/9, changed state to up 02-05-2009 16:30:41 Local7.Notice 10.2.115.182 639: 000608: Feb 5 16:30:41: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/9, changed state to down 02-05-2009 16:28:31 Local7.Notice 10.2.115.182 638: 000607: Feb 5 16:28:31: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/10, changed state to up 02-05-2009 16:28:28 Local7.Notice 10.2.115.182 637: 000606: Feb 5 16:28:28: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/10, changed state to down 02-05-2009 16:24:41 Local7.Notice 10.2.115.182 635: 000604: Feb 5 16:24:41: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/5, changed state to up 02-05-2009 16:24:38 Local7.Notice 10.2.115.182 634: 000603: Feb 5 16:24:38: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/5, changed state to down 02-05-2009 16:16:42 Local7.Notice 10.2.115.182 633: 000602: Feb 5 16:16:42: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/9, changed state to up 02-05-2009 16:16:38 Local7.Notice 10.2.115.182 632: 000601: Feb 5 16:16:38: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/9, changed state to down 02-05-2009 16:14:36 Local7.Notice 10.2.115.182 631: 000600: Feb 5 16:14:36: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/9, changed state to up 02-05-2009 16:14:33 Local7.Notice 10.2.115.182 630: 000599: Feb 5 16:14:33: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/9, changed state to down 02-05-2009 16:12:03 Local7.Notice 10.2.115.182 629: 000598: Feb 5 16:12:03: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/9, changed state to up 02-05-2009 16:12:00 Local7.Notice 10.2.115.182 628: 000597: Feb 5 16:12:00: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/9, changed state to down 02-05-2009 16:01:35 Local7.Notice 10.2.115.182 627: 000596: Feb 5 16:01:35: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/2, changed state to up 02-05-2009 16:01:32 Local7.Notice 10.2.115.182 626: 000595: Feb 5 16:01:32: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/2, changed state to down 02-05-2009 15:49:02 Local7.Notice 10.2.115.182 625: 000594: Feb 5 15:49:01: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet2/0/21, changed state to up 02-05-2009 15:49:00 Local7.Notice 10.2.115.182 624: 000593: Feb 5 15:48:59: %LINEPROTO-5-UPDOWN: Line protocol on Interface FastEthernet2/0/21, changed state to down 02-05-2009 15:43:24 Local7.Notice 10.2.115.182 623: 000592: Feb 5 15:43:24: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/2, changed state to up 02-05-2009 15:43:21 Local7.Notice 10.2.115.182 622: 000591: Feb 5 15:43:21: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/0/2, changed state to down I note that it's only the line protocol dropping, not the actual interface. I have seen this happen once when I was looking at the switch - all the activity lights froze, some went out, and then the switch happily went back to normal. It's only some of the interfaces, too - 1, 2, 5, 9 and 10 out of 12. None of the interfaces on the 3750-48 that's a stack member have been affected at all. Has anyone seen this sort of behaviour before? It's hard to know where to look. Nothing much has happened this week; we did have a new link to new switches in a building patched in on Monday but that link isn't affected (I disabled the interface and the problem was still occurring while it was down). Some PCs and phones have been set up in one of the buildings that previously were at another site, so perhaps that could be related, although the edge switches in that building show no problems internally... Regards, Damien ********************************************************************** This message is intended for the addressee named and may contain privileged information or confidential information or both. If you are not the intended recipient please delete it and notify the sender. ********************************************************************** _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/
