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S-Series Printing HostDOS messages with C-tag Repeating in Logging Buffer After Connecting EXOS Switch

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Information

 
TitleS-Series Printing HostDOS messages with C-tag Repeating in Logging Buffer After Connecting EXOS Switch
Symptoms
  • Connecte  Summit
  • Intermitttent traffic loss
    • S-Series logs error
<165>Feb 23 18:22:53 203.0.113.1 Last message repeated 21 times
<165>Feb 23 18:22:53 203.0.113.1 HostDoS[1] Attack ( arpNd ) detected on vlan.0
.34 [ InPort(ge.1.19) LEN(68) DA(FF:FF:FF:FF:FF:FF) SA(00:CA:FE:24:12:52) C-TAG(
8100:0022) ETYPESummit(0806) ]

 
Environment

  • s
    • S-Series
    • Summit
Cause
Connecting both ports of phone to same Summit causing a loop because spanning tree is not configured.
Resolution
Disconnect one of the links to the phone and configure spanning tree to prevent future problems.
 
Additional notes

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