RSSAll Entries in the "WAN" Category

Difference between Cisco Login & Login Local Commands

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 […]

Cisco pipe Command Examples with Regular Expressions

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 […]

Troubleshoot Slip Secs Errors on Cisco Controller T1 Interfaces

We will find Slip Secs Errors on Controller T1 interfaces in Cisco Routers. If slips are present on the T1 line means there is a clocking problem from Telco provider. The Customer Premises Equipment (CPE) will need to synchronize to the clocking from the T1 provider (Telco). Cisco#show controllers t1 T1 0/0/0 is up. Applique type is Channelized T1 Cablelength is long 0db No alarms detected. alarm-trigger is not set Soaking time: 3, Clearance time: 10 AIS State:Clear LOS State:Clear LOF State:Clear Version info FPGA Rev: 08121917, FPGA Type: PRK4 Framing is ESF, Line Code is B8ZS, Clock Source is Line. CRC Threshold is 320. Reported from firmware is 320. Data in current interval (255 seconds elapsed): 0 Line Code Violations, 0 Path Code Violations 12 Slip Secs, 0 Fr Loss Secs, 0 Line Err Secs, 0 Degraded Mins 0 Errored Secs, 0 Bursty Err Secs, 0 Severely Err Secs, […]

Most Useful Channelized E1 and Channelized T1 Configuration Commands

Most Useful Channelized E1 and Channelized T1 Configuration Commands Table of Contents Channelized E1 and Channelized T1 Setup Commands autodetect encapsulation cas-group (controller e1) cas-group (controller t1) channel-group clear controller clock source (controller) clock source (Cisco AS5200) controller cpp authentication cpp callback accept description (controller) description (interface) dialer outgoing dialer voice-call encapsulation cpp framing interface serial isdn answer1, isdn answer2 isdn caller isdn calling-number isdn fast-rollover-delay isdn incoming-voice data isdn not-end-to-end isdn sending-complete isdn switch-type linecode loopback (controller) loopback local (controller) loopback local (interface) loopback remote (controller) loopback remote (interface) map-class dialer pri-group show controllers e1 show controllers t1 show interfaces serial bchannel show isdn   Channelized E1 and Channelized T1 Configuration Commands This chapter describes the function and displays the syntax for channelized E1 and channelized T1 setup commands. For more information about defaults and usage guidelines, see the corresponding chapter of the Dial Solutions Command Reference. autodetect encapsulation To […]

How to create a Tunnel interface and configure between Cisco Routers

Create and Configure a Tunnel Interface on Cisco Router  You can create a Tunnel interface on Cisco Router and establish a Tunnel between two locations. Tunnel between two location Routers are useful for load sharing on WAN links or Resources. Below I will share the Tunnel configuration on Cisco Router at both ends to establish a tunnel. Create a Tunnel Interface on Cisco Router Cisco-Router(config)#interface tunnel ? <0-2147483647>  Tunnel interface number Cisco-Router(config)#interface tunnel Tunnel Configuration at A end Cisco Router: interface Tunnel100 description ***Tunnel to B location *** ip address keepalive 5 4 tunnel source tunnel destination ! interface Fastethernet 0/0 description *** Tunnel  Source Interface *** ip address secondary ip address ip accounting output-packets ip pim dense-mode ip route-cache flow ! Tunnel Configuration at B end Cisco Router: interface Tunnel104 description ***Tunnel to  A Location **** ip address keepalive […]

Verify Cisco IOS Images Checksum with MD5 File Validation

MD5 File Validation on Cisco Router The MD5 File Validation feature provides a mechanism for users to verify that Cisco IOS image files on Cisco Devices are not corrupted or incomplete. This feature uses the industry-standard MD5 algorithm for improved reliability and security. It’s always advisable to check the MD5 checksum after you downloaded the new IOS image and again after you uploaded the new image to the Cisco device. Otherwise, your Routers may not even able to bootup with corrupted images. There are free MD5 checksum program available on the Internet. One such program is the MD5 Checker. And it’s also probably good idea to store the MD5 value alongside with the image. Run MD5 file validation for Cisco IOS, It computes and displays the MD5 values, note down the MD5 values before uploading into Cisco device. How to Verify Cisco IOS Images Using the MD5 Algorithm on Cisco […]