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Examining packets on an ingress interface of a Cisco router
Pingsta Validated
Sometimes during troubleshooting, it may come in handy to be able to examine the packet...
Sometimes during troubleshooting, it may come in handy to be able to examine the packet coming into an interface on a Cisco router. This will be very handy when looking into buffer leaks and interface wedged issues.

Issue the following IOS EXEC commands:

Router# show buffers input-interface [interface type] [interface number] header command

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tags Tags: buffer leak cisco interface wedged packet software
Type: Quick Tip - Archive ID: 4.1 - last updated Last Updated: 8 months ago - 419 Views

How to enable Jumbo-Frames on a Foundry
Pingsta Validated
Just enable it in the global configuration mode with 'jumbo', then restart the system.
Just enable it in the global configuration mode with 'jumbo', then restart the system.

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tags Tags: foundry jumbo frames software
Type: Quick Tip - Archive ID: 4.12 - last updated Last Updated: about 1 year ago - 223 Views

%RTT-4-DuplicateEvent
Pingsta Validated
%RTT-4-DuplicateEvent : RTR [dec]: Duplicate event received. Event number [dec]

Symptom:

%RTT-4-DuplicateEvent : RTR [dec]: Duplicate event received. Event number [dec]

Solution:

This informational error message indicates that the Cisco IOS device has received a duplicate round-trip time monitor - RTR - process event.

Issue the router# show rtr configuration Cisco IOS command to assess and troubleshoot possible conflicts.


 

 

 


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tags Tags: applications cisco ip sla rtr
Type: Solution - Archive ID: 5.54 - last updated Last Updated: 5 days ago - 14 Views

Cisco IOS Bus Error Crash at set_if_input
Pingsta Validated
The router will crash with a bus error

Bug ID:

CSCdr45483

Resolved In:

12.0(11)S1, 12.0(12)S, 12.0(11)SC1, 12.0(12)SC, 12.1(6), 12.1(6)AA, 12.1(6)T, 12.1(6)EC, 12.1(6)E1

Symptom:

The router will crash with a bus error

Conditions:

This crash occurred on a Cisco IOS router configured for multicast when the device was processing large amounts of unicast route updates. 



Workaround:

None

Solution:

This bug is fixed in 12.0(11)S1, 12.0(12)S, 12.0(11)SC1, 12.0(12)SC, 12.1(6), 12.1(6)AA, 12.1(6)T, 12.1(6)EC, 12.1(6)E1 and later releases of IOS.

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tags Tags: bus error cisco crash cscdr45483 ios multicast software unicast
Type: Bug - Archive ID: 1.2818 - last updated Last Updated: 2 months ago - 14 Views

How to reset a Cisco router to factory default
Pingsta Validated
1. To erase the configuration file, issue the erase nvram: command. Reload the ...
1. To erase the configuration file, issue the erase nvram: command.

Reload the router by issuing the reload command.

2. If this does not solve the problem, attempt to break into ROM Monitor (ROMmon) by issuing the break sequence (usually Ctrl and break from the Hyperterminal) from a console connection.



You should see this ROMmon prompt:

rommon 1>

3. Change the configure register value to ignore the startup configuration by issuing the confreg command, as shown in this example:

rommon 2> confreg 0x2142

4. To reload the router, issue the reset command, as shown in this example:

rommon 3> reset

5. After the router boots, issue the enable command at the Router > prompt. The prompt changes to Router#, indicating that the router is now in privileged mode.

6. To enter config mode, issue the config terminal command. You should now see a Router(config)# prompt.

7. To change the configure register to recognize the startup configuration, issue the config-register command, as shown in this example:

Router (config)# config-register 0x2102

To break out of configuration mode, press Cntl and Z.

To save the blank configuration, issue the copy-running config-startup config command.

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tags Tags: cisco factory default ios router software
Type: How-To - Archive ID: 2.24 - last updated Last Updated: 4 months ago - 73 Views