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NE40E V800R010C10SPC500 Feature Description - Security 01

This is NE40E V800R010C10SPC500 Feature Description - Security
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Layer 3 Loop Detection Fundamentals

Layer 3 Loop Detection Fundamentals

Once a loop occurs on a Layer 3 network, packets cannot be forwarded normally, bringing great loss to carriers or users.

As shown in Figure 10-1, the route to 172.17.0.0/16 on Device A points to Device B, and the route to 172.17.0.0/16 on Device B does not point to Device C but unexpectedly to Device A. In this case, a routing loop is formed between Device A and Device B. Packets sent from Device A and Device B to 172.17.0.0/16 are looped between Device A and Device B and finally are sent to the CPUs of Device A and Device B for processing because of TTL timeout.

Figure 10-1 Diagram of Layer 3 loops

Layer 3 loop detection collects and analyzes statistics about TTL timeout packets sent to the CPU. By performing tracert operations to the destination IP addresses of these TTL timeout packets, Layer 3 loop detection determines whether a routing loop occurs and reports a trap, if detecting a routing loop, to notify the NMS of the IP address that generates the loop.

NOTE:

Currently, Layer 3 loop detection is supported on the IPv4 public network.

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Updated: 2019-01-03

Document ID: EDOC1100055047

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