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Some mDNS packet is sent from slave interfaces (Doc ID 2473118.1)

Last updated on JULY 22, 2020

Applies to:

Oracle Exadata Storage Server Software - Version 18.1.4.0.0 to 19.2.9.0.0 [Release 12.2]
Information in this document applies to any platform.

Symptoms

When the slave interfaces are connected to separate Cisco switches,
the switch sees duplicate multicast DNS (mDNS) packets from the same MAC on different ports,
concludes it is seeing a bridge loop and shuts one port off.

The only duplicate packets found were mDNS packets from the Link Local IPv6
addresses on the SLAVE interfaces.

This only happens when Clusterware starts. If Clusterware does not start,
the bond stays and the switch does not segment the port.

Sample:

"3378","2018-10-09 20:36:18.653960","10.211.***.***","224.0.***.***","MDNS","85","Standard query 0x0000 PTR _24c6f391CLSFR._tcp.local, ""QM"" question"
"3379","2018-10-09 20:36:18.654009","fe80::20a:f7ff:***:***","ff02::fb","MDNS","105","Standard query 0x0000 PTR _24c6f391CLSFR._tcp.local, ""QM"" question" <<<  IPv6

Changes

 None

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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