hmm.. ok , in l2_learning.py code, why did we 'match' msg with the parsed
packet??
msg = of.ofp_flow_mod()
msg.match = of.ofp_match.from_packet(packet, event.port)
I thought ofp_match() is used only for comparison . But the debug
above shows that, ofp_match() not only compares but also updates 'msg'
packet with details in the parsed packet . Is it so??
Cheers!
Durga
On Fri, Oct 25, 2013 at 5:34 AM, Murphy McCauley
<[email protected]>wrote:
> I'm afraid I don't follow the issue. Maybe you can post more code and try
> to further explain what you think is happening vs. what you think *should*
> be happening?
>
> -- Murphy
>
> On Oct 23, 2013, at 7:13 PM, durga <[email protected]> wrote:
>
> Hello All,
>
> Just needed a confirmation on my understanding about match statement, all
> the official resources mention as to matching/creating a match and the best
> way to create a match from an existing packet is as below.
> my_match = ofp_match.from_packet(packet, in_port)
>
> Now , as I debug , looks like match is actually used to compare and
> update the new packet with the details provided in the original packet and
> not just compare
>
> is this correct?
>
>
>
>
> DEBUG:l2_switching_v4:ofp_flow_mod
> header:
> version: 1
> type: 14 (OFPT_FLOW_MOD)
> length: 72
> xid: 12
> match:
> wildcards:
> nw_tos|tp_dst|dl_dst|dl_src|in_port|dl_vlan_pcp|nw_proto|dl_vlan|tp_src|dl_type|nw_src(/0)|nw_dst(/0)
> (1110000010000011111111 = 3820ff)
> cookie: 0
> command: 0
> idle_timeout: 0
> hard_timeout: 0
> priority: 32768
> buffer_id: None
> out_port: 65535
> flags: 0
> actions:
>
> *debug after ofp_flow_mod().match = ofp_match.from_packet(packet, in_port)
> *
>
> DEBUG:l2_switching_v4:ofp_flow_mod
> header:
> version: 1
> type: 14 (OFPT_FLOW_MOD)
> length: 80
> xid: 12
> match:
> wildcards: nw_tos|tp_dst|tp_src (1000000000000011000000 = 2000c0)
> in_port: 2
> dl_src: 00:00:00:00:00:02
> dl_dst: 00:00:00:00:00:01
> dl_vlan: 65535
> dl_vlan_pcp: 0
> dl_type: 0x806
> nw_proto: 2
> nw_src: 10.0.0.2
> nw_dst: 10.0.0.1
> cookie: 0
> command: 0
> idle_timeout: 0
> hard_timeout: 0
> priority: 32768
> buffer_id: None
> out_port: 65535
> flags: 0
> actions:
> type: 0
> len: 8
> port: 1
> max_len: 65535
> Cheers!
> Durga
>
>
>
