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Loopback under physical interface ?

author
girish pant
,
1

Please explain in detail about the loopback under an interface..what purpose does it solve after setting it ? I have highlighted it below.

R1#sh int s1/1
Serial1/1 is administratively down, line protocol is down
  Hardware is M4T
  MTU 1500 bytes, BW 1544 Kbit/sec, DLY 20000 usec,
     reliability 255/255, txload 1/255, rxload 1/255
  Encapsulation HDLC, crc 16, loopback not set 

Thanks in advance. 


 

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Can You answer this question?
author
Mr. Piyush Kataria

It is used to perform loopback diagnostic on serial interfaces in case of ATM.

As we are not using this technology anymore you need not worry about this.

 

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