Overlap flow
Because some limitation of ASIC, some flow installed hardware can not work as expected. User should refer to this chapter before user starts to trouble-shoot the issues.Â
udp/ip, tcp/ipÂ
When user adds flows with the same priority, and one flow's match fields includes another flow's match fields, the action of flow is at random. For example:
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admin@PicOS-OVS$ovs-ofctl add-flow br0 priority=10000,ip,in_port=14,dl_vlan=2,actions=push_vlan:0x8100,set_field:2503-\>vlan_vid,output:15 admin@PicOS-OVS$ovs-appctl pica/dump-flows #40 permanent priority=10000,ip,in_port=14,dl_vlan=2, actions:push_vlan(vid=2503),mod_vlan_pcp(pcp=0),15 Total 1 flows in TCAM. admin@PicOS-OVS$ovs-ofctl add-flow br0 priority=10000,udp,in_port=14,dl_vlan=2,tp_dst=2123,actions=push_vlan:0x8100,set_field:2500-\>vlan_vid,output:15 admin@PicOS-OVS$ admin@PicOS-OVS$ovs-appctl pica/dump-flows #41 permanent priority=10000,udp,in_port=14,dl_vlan=2,tp_dst=2123, actions:push_vlan(vid=2503),mod_vlan_pcp(pcp=0),15 #40 permanent priority=10000,ip,in_port=14,dl_vlan=2, actions:push_vlan(vid=2503),mod_vlan_pcp(pcp=0),15 Total 2 flows in TCAM.
If user doesn't want this result, user should modify the two flows' priorities.
admin@PicOS-OVS$ovs-ofctl add-flow br0 priority=12000,udp,in_port=14,dl_vlan=2,tp_dst=2123,actions=push_vlan:0x8100,set_field:2500-\>vlan_vid,output:15 ovs-ofctl add-flow br0 priority=10000,ip,in_port=14,dl_vlan=2,actions=push_vlan:0x8100,set_field:2503-\>vlan_vid,output:15 admin@PicOS-OVS$ovs-appctl pica/dump-flows #42 permanent priority=12000,udp,in_port=14,dl_vlan=2,tp_dst=2123, actions:push_vlan(vid=2500),mod_vlan_pcp(pcp=0),15 #40 permanent priority=10000,ip,in_port=14,dl_vlan=2, actions:push_vlan(vid=2503),mod_vlan_pcp(pcp=0),15 Total 2 flows in TCAM.
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