On Wed, Sep 17, 2014 at 2:22 PM, Ben Pfaff <b...@nicira.com> wrote: > On Wed, Sep 17, 2014 at 11:49:26AM -0700, Nikhil Handigol wrote: > > I've setup an OVS bridge br0 with the following commands: > > $ sudo ovs-vsctl add-br br0 > > $ sudo ovs-vsctl set bridge br0 > > protocols=OpenFlow10,OpenFlow11,OpenFlow12,OpenFlow13 > > $ sudo ovs-vsctl set bridge br0 datapath_type=netdev > > > > > > I tried to insert the following flow with a strip_vlan action: > > $ sudo ovs-ofctl -O OpenFlow13 add-flow br0 "cookie=0x0, table=1, > > send_flow_rem > > > priority=30,vlan_tci=0x0ffe/0x1fff,arp,metadata=0xffffffff00000000,arp_tpa=10.0.0.1 > > actions=strip_vlan,write_metadata:0xcafecafe00000000,goto_table:2" > > > > I get the following error: > > ovs-ofctl: none of the usable flow formats (none) is among the allowed > flow > > formats (OXM-OpenFlow13) > > > > However when I remove "strip_vlan" from the actions, the flow gets added > > correctly. What am I doing wrong? > > vlan_tci=0xffe/0x1fff looks confused, to me. It cannot ever match any > packets, because it looks for a packet with no VLAN header (because bit > 12 is not set in the value) but a nonzero VLAN ID (because bits 0-11 are > nonzero in the value). > > I imagine that the root of the problem, though, is that (based on bit 12 > of vlan_tci) the flow's packets have no VLAN yet the actions are trying > to strip a VLAN header. >
Why does bit 12 set to 0 indicate absence of VLAN header? According to the wiki page (http://en.wikipedia.org/wiki/IEEE_802.1Q), bit 12 is DEI, which specifies whether packets can be dropped when there is congestion. So, it seems like both 0 and 1 are valid values for bit 12.
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