We have a stack of 3 Catalyst 3750 (WS-C3750G-24TS) switches. The second switch in the stack started to reboot randomly several times a day, causing complete chaos on the network. There is no indication on what is going wrong. I see no crashlog file on any of the switches. The log files contain no useful information, other than the system restart and the interfaces coming back up, for example:
00:01:18: %SYS-5-RESTART: System restarted -- (CAT3750-01-2)
2w2d: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet2/0/23, changed state to up
2w2d: %STACKMGR-6-SWITCH_REMOVED: Switch 2 has been REMOVED from the stack
13:49:36: %STACKMGR-6-SWITCH_REMOVED: Switch 2 has been REMOVED from the stack
I have checked and replaced the power cables, does not seem to be a problem.
The IOS version is 12.1(19) EA1c.
The results of sh ver:
Cisco Internetwork Operating System Software
IOS (tm) C3750 Software (C3750-I5-M), Version 12.1(19)EA1c, RELEASE SOFTWARE (fc2)
I have upgraded the stack to the latest firmware 12.2(50)SE1, the switch 2 still reboots every 2 hours. After the upgrade it lasted for almost 12 hours without the reboot. No crash files on flash1, 2 or 3.
Two interesting side effects after the firmware upgrade:
1. On the GBIC ports 25-28, the LEDs are mixed-up. For example, port 28 is connected, but the LED 28 is dark and the LED 26 is blinking. On the second switch the port 27 is connected, LED 27 is dark but the LED 25 is blinking. Traffic passes normally. âshow ip interface brief â displays the status of the interfaces correctly. The web interface also shows the status of the ports correctly.
2. I have notice a lot of messages similar to â00:06:40: %SW_MATM-4-MACFLAP_NOTIF: Host 0030.4880.6166 in vlan 10 is flapping between port Gi2/0/13 and port Gi1/0/13â The MAC address belongs to the server with teamed network cards. The teaming protocol is âStatic Link Aggregationâ. Changing it to âAdaptive Load Balancingâ or âIEEE 802.3ad Dynamic Link Aggregationâ eliminates the message. Silly question - which one is better?
Tonight I will be replacing the switch 2 with the spare one. I have set the existing stack master to the higher priority, so it stays master with the addition of the new switch. The new switch has exactly the same firmware. Anything else I need to take care of before replacing the switch?
Make sure the stack cables are tight , they can seem tight by hand but you may have to snug them by screwdriver to get them as tight as they should be . Also the stack cables themselves have been known to be faulty from the factory , I think there was even a TSB on this at one point.
The ports are not mixed up, only LEDs are. The ports status of the interfaces shows correctly both from CLI and web-interface. Before the firmware update LEDs were working properly. Is it the firmware itself? I was using the latest at the time version 12.2(50)SE1. I see that the newer, 12.2(50)SE2 is now available. Should I update the firmware again?
An update. After replacing the switch in question with the spare one the reboots stopped. Must be the hardware failure. The only problem left - LED are mixed up on GBIC ports, as described in my other posting.
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...
Attached policy provides CLI access to the Cisco 4G router over text messaging. Two files are in the attached .tar file:
2. PDF with instructions on how to load and use the .tcl file.