Alejandro Vargas' Blog

Connection from Data Center to Cisco Switch issue on Exadata X7

Alejandro Vargas
Technical Leader, ACS Global Delivery, Infrastructure & BigData

It may happen that when trying to reach the Exadata machine using the management network, the data center switch that connects to the Exadata Cisco switch get a 'connection rejected' error.

On X7-2 port 48 of the Cisco switch is setup by default as ‘spanning tree network’ that set the BPDU* filter to disable, and communications between customer switch and the Cisco are rejected.

To solve run this command on the Cisco:

  • spanning tree BPDU filter en

Enabling BPDU filtering in the interface level stops sending or receiving BPDU on this interface; this is the same as disabling spanning tree on the interface.

See on My Oracle SupportCisco 93108 switch is getting Error Disabled on the Uplink Switch (Doc ID 2360702.1)

* BPUD stands for: Bridge Protocol Data Unit. BPDUs are data messages that are exchanged across the switches within an extended LAN that uses a spanning tree protocol topology


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