Can someone please help with a recipe on how to delete a VLAN tag if it
exists in the packet? I want to do this OpenFlow version >1.3? Note that I
could achieve with OF 1.0 and Ryu as highlighted below.
I tried the following code:
ofp_parser = ofproto_v1_3_parser
actions = [
ofp_parser.OFPActionPopVlan(),
ofp_parser.OFPActionSetField(vlan_vid=ofproto_v1_3.OFPVID_PRESENT |
100),
ofp_parser.OFPActionOutput(3, 0)
]
match = ofp_parser.OFPMatch(in_port=1)
inst = [
ofp_parser.OFPInstructionActions(ofp.OFPIT_APPLY_ACTIONS, actions)
]
m = ofp_parser.OFPFlowMod(self.dp, 0x1234, 0, 0, ofp.OFPFC_ADD, 0,
0, 100, UINT32_MAX, ofp.OFPP_ANY,
ofp.OFPG_ANY, 0, match, inst)
This results in following error in OVS (got this from using "ovs-ofctl
snoop s1 --detach"):
OFPT_FLOW_MOD (OF1.3) (xid=0x6accfc95): ***decode error:
OFPBAC_MATCH_INCONSISTENT***
OFPT_ERROR (OF1.3) (xid=0x6accfc95): OFPBAC_MATCH_INCONSISTENT
OFPT_FLOW_MOD (OF1.3) (xid=0x6accfc95):
(***truncated to 64 bytes from 112***)
00000000 04 0e 00 70 6a cc fc 95-00 00 00 00 00 00 12 34 |...pj..........4|
00000010 00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 64 |...............d|
00000020 ff ff ff ff ff ff ff ff-ff ff ff ff 00 00 00 00 |................|
00000030 00 01 00 0c 80 00 00 04-00 00 00 01 00 00 00 00 |................|
If I use ofproto_v1_1_parser, I could create the flow
actions = [
ofp_parser.OFPActionStripVlan(),
ofp_parser.OFPActionVlanVid(100),
ofp_parser.OFPActionOutput(3, 0)
]
match = ofp_parser.OFPMatch(in_port=1)
m = ofp_parser.OFPFlowMod(self.dp, match, 0x1234, ofp.OFPFC_ADD,
priority=100, actions=actions)
>From ovs-ofctl dump-flows:
cookie=0x1234, duration=849.909s, table=0, n_packets=14, n_bytes=1008,
reset_counts priority=100,in_port="s1-eth1"
actions=pop_vlan,push_vlan:0x8100,set_field:4196->vlan_vid,output:"s1-eth3"
Thanks,
-Vasu
*Vasu Dasari*
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