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Internal Loopback Detection

Created: Jan 11, 2020 03:18:55Latest reply: Jan 11, 2020 03:23:33 167 1 0 0 0
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Hello friends,

Whether an interface receives traffic after Internal Loopback Detection is enabled on the interface?

Thanks.


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Featured Answers
Popeye_Wang
Admin Created Jan 11, 2020 03:23:33

Hi Sprout,

In internal loopback detection, a packet from an interface is sent back to the interface through the internal chip. Internal loopback detection checks whether the connection between the interface and internal chip is normal. 

As shown in the following figure, after internal loopback detection is enabled on GE0/0/1, the chip generates some test packets, and these test packets are sent back to the chip through GE0/0/1. The internal loopback detection is complete.

loopback

Loopback detection interrupts the operation of Ethernet interfaces and links. After loopback detection is performed, run the undo loopback command to disable loopback detection immediately.

I hope this helps.

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All Answers
Popeye_Wang
Popeye_Wang Admin Created Jan 11, 2020 03:23:33

Hi Sprout,

In internal loopback detection, a packet from an interface is sent back to the interface through the internal chip. Internal loopback detection checks whether the connection between the interface and internal chip is normal. 

As shown in the following figure, after internal loopback detection is enabled on GE0/0/1, the chip generates some test packets, and these test packets are sent back to the chip through GE0/0/1. The internal loopback detection is complete.

loopback

Loopback detection interrupts the operation of Ethernet interfaces and links. After loopback detection is performed, run the undo loopback command to disable loopback detection immediately.

I hope this helps.

View more
  • x
  • convention:

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