Cisco IOS on Unix (IOU)or Cisco IOS Linux(IOL) is available on the Internet for practice various types of labs. I tested the labs on IOU WEB and observed that Mozilla Firefox is best suited browser to open the IOU WEB application and also we can choose Telnet or SSH client for labs configuration. Normally we have multiple telnet or SSH clients on the Internet which are fee or paid. You can choose any telnet or SSH client for Cisco IOU WEB from Mozilla Firefox Browser. Super putty or Secure CRT will open multiple tabs in same window so that we can configure easily. Customize Telnet or SSH client for CISCO IOU WEB LABS Go to options –> Applications –> Telnet –> Action drop down –> choose any installed Telnet or SSH client software.
There are two commands login and login local under line VTY, CONSOLE and AUX configuration in Cisco IOS, login command is used for access the device using password which is configured under line configuration and login local command is used for access the device using local username database. Login Command Configuration on Line VTY I have configured login command under line VTY and local username database as below. ciscoconsole#sh run | b line vty line vty 0 4 password cisco login transport input all line vty 5 15 password cisco login transport input all ! We can configure local user accounts on a Cisco router or switch and it is much easier to login when login fallback from Tacacs+/Radius to local. When you are creating users on a Cisco router we can assign different privilege levels(0-15) to different users to restrict access to certain commands. You may want a junior […]
We use the pipe (|) command more frequently on Cisco devices to get specific output of show & troubleshooting commands. Below are the available options for Pipe (|) command from Cisco ASR1002 Router. Cisco_Router#sh run | ? append Append redirected output to URL (URLs supporting append operationonly) begin Begin with the line that matches count Count number of lines which match regexp exclud eExclude lines that match format Format the output using the specified spec file include Include lines that match redirect Redirect output to URL section Filter a section of output tee Copy output to URL Append option will send all output from the show command to be appended to a file already created at either a local (flash: disk:) or remote (ftp: tftp:) location. Example: The below command would copy the output off the show running-config command to an ftp server […]
In this post I will explain the steps to find the client/end user computer connected physical interface in large Network environment with multiple Access Switches connecting to the core switches or routers. This will help you to trace and troubleshoot devices like a PC or a laptop or other end devices. This is not a difficult task but can certainly be time consuming. You can trace the physical interface by using MAC address or IP address. You can find the MAC address with “sh ip arp” command of particular IP address in gateway router. Let’s start with an IP address. Find out gateway router while checking traceroute to the IP address then login into second hop IP address from end and enter “sh ip arp X.X.X.X” command. C:\>tracert 172.16.24.42 Tracing route to 172.16.24.42 over a maximum of 30 hops 1 1 ms 1 ms 2 ms 192.168.202.1 2 1 ms <1 ms <1 […]
Benefits of /31 subnets for point-to-point links In general we use the /30 bit subnet mask for point to point networks and will get two usable host IP addresses for point to point configuration except one network and one broad address. Now we can use 31-bit subnet mask for point to point networks and it will save the IPv4 address space. In this subnet there is no unused network and broadcast address and it uses only two IP addresses: all zero bits and all one bits in the host portion of the IP address. In /31 subnet the two IP addresses are used as host addresses, and do not require broadcast support because any packet that is transmitted by one host is always received by the other host at the receiving end. Therefore, directed broadcast on a point-to-point interface is eliminated. Support for an IPv4 address with a 31-bit subnet […]
Cisco CallManager Express (CME) Vs Cisco CallManager (CCM) Now you can find the difference between Cisco CallManager Express (CME) and Cisco CallManager (CCM). Both CallManager and CallManager Express are different products with their own strengths. CallManager Express has less feature set or scalability as compared with CallManager therefore the price to make it more viable for smaller businesses Cisco CallManager express (CUCME) is a full UC solution integrated inside the Cisco ISR Router targeting SMB customers. Cisco CallManager (CUCM) is a full UC platform, providing IP Telephony, Mobility and Collaboration services to large Enterprise Customers, Cisco Unified CME is a feature-rich entry-level IP telephony solution that is integrated directly into Cisco IOS software and it runs on a Router, specifically any of the ISR 2800/3800 or the ISR-G2 2900/3900 series Routers. Both network and voice services bundled into one Cisco IOS platform. Cisco Unified CME allows small business customers and autonomous small enterprise branch offices to […]