i am facing some problem in cisco 1841 router. after 10-15 mini. router hang. when router hang then i am access the router through telnet , but no command support. but if I ping any internet side it is pinging. but internet side not opening in the client machine, but If i switch off the router and again switch ON the router every thing is work fine, recently i am upgrade the router IOS, any one please help
For this high cpu issues, we suggest access via console, to get some commands, like show proc cpu, and verify what could be the cause.
if the router hangs again, please try to capture some information like a stack trace (see below)from rommon as well as sh tech (includes sh ver, sh run, sh int) and sh log outputs.
Here is some helpful info:
Console Not Responding
Console problems occur when the router becomes unresponsive to input at the console port. If the console is not responsive, it means that a high priority process prevents the console driver from responding to input. Troubleshooting Steps Verify cable connectivity. Verify that the power supply is on and running. Verify the router LED status. If all LEDs are down, it is most likely an issue with the power supply of the router. If traffic is still flowing through the router: Try disconnecting network interfaces and see if the router starts responding. Many times the router thinks it is doing something too important to service exec sessions. You can also attempt to reproduce the problem after issuing the following commands:
On the Cisco 7200 and 7500 series: configure terminal scheduler allocate 3000 1000
The scheduler allocate command guarantees CPU time for low priority processes by putting a maximum time allocated to fast-switching (3000 microseconds - usec) and process-switching (1000 usec) per network interrupt context. On all other platforms, use: configure terminal scheduler interval 500
The scheduler interval command allows low priority processes to be scheduled every 500 usec, thereby allowing some commands to be typed even if CPU usage is at 100%. Obtaining a Stack Trace from ROM Monitor K-trace refers to the procedure used to obtain a stack trace from the router from ROM Monitor. On routers with older ROM Monitor code, a stack trace is obtained with the k command. On routers running more recent ROM Monitor code, the stack command can also be used. The procedure for obtaining stack traces from a router that is not responding is provided below:
1.Enable the break sequence by changing the configuration register value. The eighth bit value must be set to zero so that break is not ignored. A value of 0x2002 works. Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#config-register 0x2002 2.Reload the router so that the new configuration register value is used. 3.Send the break sequence when the problem occurs. The ROM Monitor prompt ">" or "rommon 1 >" should be displayed. 4.Capture a stack trace by collecting the output from either the k 50 or stack 50 commands. Adding 50 to the command prints a longer stack trace. 5.Issue the c or cont command to continue. 6.Repeat the three last steps several times to ensure that multiple points in a continuous loop have been captured. 7.After several stack traces have been obtained, reboot the router to recover from the hung state. Here is an example of this procedure:
User break detected at location 0x80af570 rommon 1 > k 50 Stack trace: PC = 0x080af570 Frame 00: FP = 0x02004750 RA = 0x0813d1b4 Frame 01: FP = 0x02004810 RA = 0x0813a8b8 Frame 02: FP = 0x0200482c RA = 0x08032000 Frame 03: FP = 0x0200483c RA = 0x040005b0 Frame 04: FP = 0x02004b34 RA = 0x0401517a Frame 05: FP = 0x02004bf0 RA = 0x04014d9c Frame 06: FP = 0x02004c00 RA = 0x040023d0 Frame 07: FP = 0x02004c68 RA = 0x04002e9e Frame 08: FP = 0x02004c78 RA = 0x040154fe Frame 09: FP = 0x02004e68 RA = 0x04001fc0 Frame 10: FP = 0x02004f90 RA = 0x0400c41e Frame 11: FP = 0x02004fa4 RA = 0x04000458 Suspect bogus FP = 0x00000000, aborting rommon 2 > cont This procedure should be repeated several times in the event of a system problem to collect multiple instances of that stack trace.
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.