Have you lost or corrupted an IOS? These procedures descibe:
BPDU guard and root guard are similar, but their impact is different. BPDU guard disables the port upon BPDU reception if PortFast is enabled on the port. Read more…
This is the minimum configuration needed to support inbound SSH sessions on a router (you might want to add transport input ssh to the line configuration if you want to disable telnetaccess to the router): Read more…
Scenario: Say a device in your network performs incremental backups out to a server on the internet. These backups consume bandwidth and ruin the quality of your VoIP calls. You wish to throttle the bandwidth for this server traffic between 6 and 10pm (when you feel you need good phone quality). Read more…
This is a handy TCL scipt if you need to ping lots of IP addresses. If your router supports TCL you can:
Enable TCL on router: R1#tclsh
Quit TCL: R1#tclquit
TCL SCRIPT FOLLOWS: Read more…
NOTE: investigate “snmp mib persistant” command on IOS.
here is a “how to” for monitoring QoS with MRTG: Read more…
How to configure IOS device for authentication to TACACS server for administrative logins: Read more…
The latest Cisco TAC Newsletter had an interesting tip on recovering hidden pre-shared keys (which I’ve needed to do many times). So simple, it’s brilliant :) here’s the reprint: Read more…
How to avoid two people making changes to the configuration at the same time
The only command you need to use is the configuration mode exclusive {auto | manual} from global configuration mode.
Here is how to do it: Read more…
When capturing log sessions during an outage or debug session it’s crucial to keep a history of what was done when and in what order. This helps in post mortem analysis after the event or session is over. There are a couple of standard things to do to help this such as:
In addition to these here are a few other tips that really help TAC analyse log and debug sessions that are collected: Read more…
