See inline.
On Jan 12, 2015, at 1:04 AM, TALAL AL-HARBI <[email protected]> wrote:
> I added a print statement to spanning tree code:
>
> # Now modify ports as needed
> try:
> change_count = 0
> for sw, ports in tree.iteritems():
> con = core.openflow.getConnection(sw)
> if con is None: continue # Must have disconnected
> if con.connect_time is None: continue # Not fully connected
>
> if _hold_down:
> if con.connect_time > enable_time:
> # Too young -- we should hold down changes.
> if force_dpid is not None and sw == force_dpid:
> # .. but we'll allow it anyway
> pass
> else:
> continue
>
> tree_ports = [p[1] for p in ports]
> for p in con.ports.itervalues():
> print "Ports", p
> <----------------------- Here
> if p.port_no < of.OFPP_MAX:
> flood = p.port_no in tree_ports
> print "Flood", flood
You're printing out the value here and seeing that it's False...
> if not flood:
> if core.openflow_discovery.is_edge_port(sw, p.port_no):
> flood = True
.. but it's being changed to True right here if the port doesn't connect two
switches, which is exactly the case you're talking about.
> if _prev[sw][p.port_no] is flood:
> #print sw,p.port_no,"skip","(",flood,")"
> continue # Skip
> change_count += 1
> _prev[sw][p.port_no] = flood
> #print sw,p.port_no,flood
> #TODO: Check results
>
> Subject: Re: [pox-dev] Spanning Tree Algorithm
> From: [email protected]
> Date: Mon, 12 Jan 2015 00:55:34 -0800
> CC: [email protected]
> To: [email protected]
>
> I don't have enough information to understand or evaluate the information
> you've given about port status. Where does it come from? Are you querying
> the switch, or is it from one of the datastructures in spanning_tree.py, or
> something else? When are you printing it?
>
> And what options are you using to run discovery and spanning_tree?
>
> -- Murphy
>
> On Jan 12, 2015, at 12:47 AM, TALAL AL-HARBI <[email protected]> wrote:
>
> Dear Murphy
>
> After the connection is established, ports status set to false expect those
> who are between switches and no correcting a loop even ports where hosts
> attached to.
>
> I have printed ports status with basic topology:
>
> Ports s1-eth1:1 ------> where host1 attached to
> Flood False
> Ports s1-eth2:2 -------> Link between S1 & S2
> Flood True
> Ports s1:65534
> Ports s2-eth1:1 ------> where host2 attached to
> Flood False
> Ports s2-eth2:2
> Flood True
> Ports s2:65534
>
> In this case, why once s1 gets arp request, broadcast it out of port1?
>
> Best,,,
> Talal
> Subject: Re: [pox-dev] Spanning Tree Algorithm
> From: [email protected]
> Date: Fri, 9 Jan 2015 19:28:22 -0800
> CC: [email protected]; [email protected]
> To: [email protected]
>
> I believe you're mistaken and the ports to which hosts are attached have
> flood enabled. What makes you think this isn't the case?
>
> -- Murphy
>
> On Jan 9, 2015, at 7:21 PM, TALAL AL-HARBI <[email protected]> wrote:
>
> If you print out ports status, you would see they are false.
>
> Sent from my iPhone
>
> On Jan 9, 2015, at 9:46 PM, Amer <[email protected]> wrote:
>
> Dear Talal
>
> The ports that are connected to hosts are not creating loops, thus it will
> not be disabled.
>
> Best regards,
> Amer
>
> Sent from my iPhone
>
> On ٠٩/٠١/٢٠١٥, at ١٠:٠٥ ص, TALAL AL-HARBI <[email protected]> wrote:
>
> Hello There,,,
>
> I'm a bit confused about spanning tree algorithm. After detecting all links,
> it disables the one creating the loop. However, ports where hosts attached to
> are still False(Means no flood?). Pings were successful, how ?
> Thank you!!!
>
> Cheers,,,
> Talal
