[ovs-discuss] CDP (cisco discovery protocol) packets being dropped by OVS

Ben Pfaff blp at nicira.com
Tue Mar 31 15:32:23 UTC 2015


On Tue, Mar 31, 2015 at 11:47:36AM +0000, Field, Brian wrote:
> One thing I¹m still grappling with is what¹s written in
> ovs-vswitchd.conf.db(5) and the behavior I¹m seeing by setting this option
> to true.  Namely, in http://openvswitch.org/ovs-vswitchd.conf.db.5.pdf
> under "other_config : forward-bpdu: optional string, either true or
> false², the last two sentences say "Default is disabled, set to true to
> enable. The following destination MAC addresss will not be forwarded when
> this option is enabled.²  And the CDP MAC is listed:
> 
> 01:00:0c:cc:cc:cc Cisco Discovery Protocol (CDP), VLAN Trunking Protocol
> (VTP), Dynamic Trunking
> Protocol (DTP), Port Aggregation Protocol (PAgP), and others
> 
> So when I read this part of the doc, it seems to suggest that setting
> forwarding-bpdu=true should cause CDP frames not to be forwarded‹ but in
> reality setting this option to true enabled them to be forwarded.

The description was badly written.  Oops.

Thanks for the bug report.  I sent out an improvement for the
documentation:
        http://openvswitch.org/pipermail/dev/2015-March/053058.html



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