Computer Networking

Steps to prepare for the extended ping test:

1. Insert the plug into the port in question.

2. Use the write memory command to save your router configuration. For example:

   bru-nas-03#write memory
      Building configuration... [OK]

3. To run the loopback test on channelized E1s (PRI or CAS) we need to use the channel-group E1 controller command to create one or more serial interfaces mapped to a set of timeslots in the channelized E1. If the E1 is configured as a PRI you need to remove the pri-group before using the channel-group command. If you are not using a channelized E1, proceed to step 4.

   bru-nas-02#configure terminal
   Enter configuration commands, one per line.  End with CNTL/Z.
   bru-nas-02(config)#controller e1 0
   bru-nas-02(config-controller)#no pri-group timeslots 1-31
   bru-nas-02(config-controller)#channel-group 0 timeslots 1-31
   

   Note: This creates a single Serial0:0 interface (where the first 0 stands for the controller and the second 0 represents the channel-group number) using all 31 timeslots for an aggregate of 1.984Mbps.

4. Set the encapsulation for interface serial 0:0 to High-Level Data Link Control (HDLC) in interface configuration mode. For example:

   bru-nas-03(config)#interface serial 0:0
   bru-nas-03(config-if)#encapsulation HDLC
   bru-nas-03(config-if)#^Z
   

5. Use the show running config command to see if the interface has a unique IP address. If the serial interface above does not have an IP address, obtain a unique address and assign it to the interface with a subnet mask of 255.255.255.0. For example:

   bru-nas-03(config-if)#ip address 172.22.53.1
   

6. Clear the interface counters using the clear counters command. For example:

   bru-nas-03#clear counters 
   Clear "show interface" counters on all interfaces [confirm]
   bru-nas-03#

7. Perform the extended ping test as described in the extended ping test section.