Thank you Murphy.
I am trying to look at the Flow table entries in the POX controller while
one host is pinging another. So when I write the following piece of code:
.
.
.
*for f in event.stats:
show_flow_entries = f.show()*
*log.info("Shows everything: %s", show_flow_entries)*
.
.
.
it gives me the following output (the entire flow table entry for the
particular flow), which is expected:
*INFO:flow_stats:Shows everything: length: 96
table_id: 0
match:
wildcards: (0 = 0)
in_port: 3
dl_src: 00:00:00:00:00:04
dl_dst: 00:00:00:00:00:03
dl_vlan: 65535
dl_vlan_pcp: 0
dl_type: 0x800
nw_tos: 0
nw_proto: 1
nw_src: 10.0.0.4
nw_dst: 10.0.0.3
tp_src: 0
tp_dst: 0
duration_sec: 9
duration_nsec: 791000000
priority: 65535
idle_timeout: 10
hard_timeout: 30
cookie: 0
packet_count: 9
byte_count: 882
actions:
type: 0
len: 8
port: 2
max_len: 0*
Now my questions are:
1. where are these actions defined for the given rules?
2. Suppose I want to extract and display individual elements of the
actions, for example, the *type* or the* len* entries from the above
output, how do I do this? When I try to display* f.actions*, it gives me an
output which looks like the below:
*[<pox.openflow.libopenflow_01.ofp_action_output
object at 0x977d9cc>]*. What does this mean? And how do I extract the
individual entries from this list?
3. Suppose I want to modify or add actions, how do I go about it?
Many Thanks,
Udita
On Tue, Mar 19, 2013 at 4:08 PM, Murphy McCauley
<[email protected]>wrote:
> On Mar 19, 2013, at 6:07 AM, udita gangwal wrote:
>
> I would like to know how the Flow Table entries (Rule, Actions and Stats)
> could be viewed using the POX controller?
>
> Send the switch an ofp_flow_stats_request. Handle the
> resulting FlowStatsReceived event. The event object will have a list of
> ofp_flow_stats in the stats attribute. These ofp_flow_stats entries
> contain the match, actions, and stats.
>
> This is exactly what the web flows example does. It then summarizes only
> the flows on port 80. (It should actually check that it's specifically
> TCP, but it doesn't.)
>
> I also want to know what the variable “web_flows” signifies in the code
> “flow_stats.py” which is given in the POX wiki. Why is it incremented by 1
> every time?
>
> Because it's counting the number of flow entries that use port 80 -- flows
> carrying web traffic. This is so it can print out a message like: "Web
> traffic: 96695 bytes over 16 flows". That is, there are 16 flows that use
> port 80, and 96695 bytes have been transferred over all of them.
>
> -- Murphy
>
