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RX Frame Errors/rx_length_errors were Triggered by Malformed Learning Packets in Network Bonding Mode 5/6 (Doc ID 1634220.1)

Last updated on MAY 17, 2021

Applies to:

Oracle VM - Version 3.0.1 and later
Linux OS - Version Oracle Linux 5.0 and later
Oracle Cloud Infrastructure - Version N/A and later
Linux x86-64
Linux x86


Network bonding is configured for Mode 5 (balance-tlb) or Mode 6 (balance-alb).

Symptom 1:
RX frame errors are seen in ifconfig output:



When bonding is configured for rlb[mode=5]/alb[mode=6], bonding driver sends learning packets to keep updating the upstream switch's MAC addresses table for the slave port to ensure it's correct. Since the alb mode can move MAC addresses around amongst the set of bonding slaves, e.g when active slave fails, its MAC address is swapped with another slave chosen as next active slave.


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