2015-03-13 0:17 GMT+08:00 Clément Rault <[email protected]>:
> Hi,
>
> Is there a way to see if a group entry has been used (i.e. if a packet
> has been sent to this entry) and which bucket action has been
> selected?
>
> Because I'm experiencing something weird with a group.
>
> Packets towards 11.0.0.2 (with vlan tag to 1) arrive at switch 6 and I
> wrote a group entry to match them.
>
> curl -X POST -d '{
> "dpid": 6,
> "type": "SELECT",
> "group_id": 1,
> "buckets": [
> {
> "weight": 1,
> "watch_port": 1,
> "actions": [
> {
> "type": "OUTPUT",
> "port": 1
> }
> ]
> },
> {
> "weight": 1,
> "watch_port": 2,
> "actions": [
> {
> "type": "OUTPUT",
> "port": 2
> }
> ]
> },
> {
> "weight": 1,
> "watch_port": 3,
> "actions": [
> {
> "type": "OUTPUT",
> "port": 3
> }
> ]
> },
> {
> "weight": 1,
> "watch_port": 4,
> "actions": [
> {
> "type": "OUTPUT",
> "port": 4
> }
> ]
> }
> ]
> }' http://localhost:8080/stats/groupentry/add
>
> curl -X POST -d '{
> "dpid": 6,
> "cookie": 1,
> "cookie_mask": 1,
> "table_id": 0,
> "idle_timeout": 0,
> "hard_timeout": 0,
> "priority": 11112,
> "flags": 1,
> "match":{
> "nw_dst": "11.0.0.2",
> "eth_type": 2048,
> "vlan_vid": 1
> },
> "actions":[
> {
> "type":"GROUP",
> "group_id": 1
> }
> ]
> }' http://localhost:8080/stats/flowentry/add
>
> But when I inspect with wireshark the packets are not sent to any
> outport and I don't understand why.
>
> I wrote a flow entry to see if I was matching correctly on them:
>
> curl -X POST -d '{
> "dpid": 6,
> "cookie": 1,
> "cookie_mask": 1,
> "table_id": 0,
> "idle_timeout": 0,
> "hard_timeout": 0,
> "priority": 11113,
> "flags": 1,
> "match":{
> "nw_dst": "11.0.0.2",
> "eth_type": 2048,
> "vlan_vid": 1
> },
> "actions":[
> {
> "type":"OUTPUT",
> "port": 4
> }
> ]
> }' http://localhost:8080/stats/flowentry/add
>
> And it worked, after adding this entry all packets were sent to outport 4.
>
> So I guess there is a problem with the group that I wrote but I don't
> know what...
>
>
> What is the standard behaviour for a select group type?
>
> From the documentation I understood that it's a round robin mechanism
> but when I investigate it it looks like all the packets are always
> taking the first bucket (live).
>
> How can I achieve a round robin behaviour then? I thought that I just
> need to put the same weight to each action bucket.
>
Hi,
According to page 21, OpenFlow Switch Specification 1.3.4:
Optional: select: Execute one bucket in the group. Packets are processed by
a single bucket in the group, *based on a switch-computed selection
algorithm* (e.g. hash on some user-configured tuple or simple round
robin). *All
configuration and state for the selection algorithm is external to
OpenFlow.*
So openflow does not help. Check your switch configurations for your needs.
--
Sincerely,
Wei-Li Tang
RD Engineer, Xinguard Inc.
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