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Cisco Bug: CSCvt64058 - Loopback error is not detected on trunk interface

Last Modified

Sep 10, 2020

Products (1)

  • Cisco Catalyst 9200-L Series Switches

Known Affected Releases

16.12.3 17.3.1 17.4.1

Description (partial)

Symptom:
Loopback error is not detected on trunk interface - On a trunk interface, when its native vlan is blocked, because of STP block forward, the same loopback packet is not received on the interface that it sent to the connected traffic generator.

Conditions:
Problem occurs only when native vlan of the interface is blocked i.e., in trunk allowed vlan list, native vlan is not allowed.
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