topic Re: HP 2920-24G w/ POX Controller in Software Defined Networking

HP 2920-24G w/ POX Controller

Jason_Hughes — Fri, 11 Oct 2013 04:03:24 GMT

Hello,

Wondering if anyone in this forum has attempted to connect a POX Controller with an HP 2920-24G Switch? Latest version of switch software loaded (WB.15.13.0003). I have a virtual environment setup inside GNS3 (Backtrack 5 workstation and Ubuntu 12.04 workstation) connected through physical NICs on the host machine and to physical ports on the HP switch. With proper IP addressing and the switch just functioning as a normal every day switch, I can ping all day long between the host. I also have an OpenFlow POX Controller loaded on a virtual Ubuntu 12.04 workstation and connected through a physical NIC to the OOBM port on the HP switch. All virtual machines are run with VirtualBox. I have a seperate class C addressing setup with the POX Controller and OOBM port and can SSH from this controller to the switch and fully manage the switch. When I launch the POX controller running even just hub mode or basic switch, I received a connected status on the controller and on the switch when I do a "show openflow instance aggregate". Therefore, all seems to be working properly, but I can no longer ping or access the wiki page built on the Ubuntu workstation and when I do a "show openflow instance aggregate flows", no flows are being saved. My guess is this has to be an issue with the POX controller, but wondering if there is a dependance in the standard that the POX controller needs that isn't supported in the 1.0 standard implementation by HP.

Thanks in advance!

Re: HP 2920-24G w/ POX Controller

weiming — Tue, 15 Oct 2013 00:08:31 GMT

Please send me the following:

show running-config
show openflow instance aggregate

Basically for Openflow 1.0, both controller and switch are quite generic without restrictions.

Re: HP 2920-24G w/ POX Controller

Jason_Hughes — Tue, 15 Oct 2013 18:47:08 GMT

Much thanks for your reply!

I tore down the configuration without saving (stupid) to test the controller in-band. Plan to go back in a couple days when I have a couple of hours and configure the controller through the OOBM port again. Will test and confirm previous results to make sure I'm not chasing my tail on this and then post the config info and aggregate instance information.

Jason

Re: HP 2920-24G w/ POX Controller

weiming — Wed, 16 Oct 2013 23:02:54 GMT

Hi Jason,

We did tests with POX and HP 2920 at our lab. We tried to simulate your test. Our tests resulted in good news, i.e., POX did indeed install 2 flows on the HP 2920.

Please compare our configuration, POX version, etc. with yours, and let us know how we can isolate what issues you are running into.

root@openflow-virtual-machine:~/pox/pox# ./pox.py samples.pretty_log forwarding.l2_learning

[core ] POX 0.2.0 (carp) is up.

[openflow.of_01 ] <class 'pox.openflow.PacketIn'> raised on dummy OpenFlow nexus

[openflow.of_01 ] [a0-b3-cc-b1-db-80|4096 2] connected

[openflow.of_01 ] [a0-b3-cc-b1-db-80|4096 2] closed

[openflow.of_01 ] <class 'pox.openflow.PacketIn'> raised on dummy OpenFlow nexus

[openflow.of_01 ] [a0-b3-cc-b1-db-80|4096 4] connected

We see here that the OF connection 1.0 was actually complete (look at the last line - [openflow.of_01 ] [a0-b3-cc-b1-db-80|4096 4] connected ) This shows that it was connected with no issues. I used the forwarding.l2_learning module.

Here is the config that I used. What does your config look like?

hostname "openflow-test"

module 1 type j9728a

snmp-server community "public" unrestricted

openflow

enable

controller-id 1 ip 132.0.1.193 controller-interface vlan 1321

instance aggregate

listen-port

controller-id 1

limit software-rate 2000

enable

exit

oobm

ip address dhcp-bootp

exit

vlan 1

name "DEFAULT_VLAN"

no untagged 1-2,48

untagged 3-47,A1-A2,B1-B2

ip address dhcp-bootp

exit

vlan 100

name "VLAN100"

untagged 1-2

ip address 192.168.1.1 255.255.255.0

exit

vlan 1321

name "VLAN1321"

untagged 48

ip address 132.0.1.217 255.255.255.0

exit

openflow-test(of-inst-aggregate)# show openflow

OpenFlow Version 1.0

OpenFlow : Enabled

Max. Policy Engine Usage (%) : 50

Hardware Stats. Refresh Rate : 20 seconds

Instance Information

No. of No. of

Instance Name Oper. Status H/W Flows S/W Flows

--------------------------------- ------------ ---------- ----------

aggregate Up 0 2

openflow-test(of-inst-aggregate)# show openflow instance aggregate flows

OpenFlow Flow Table

Flow 1

Incoming Port : 1 Ethernet Type : IP

Source MAC : 000006-2cb437 Destination MAC : 000006-2cc01e

VLAN ID : 100 VLAN Priority : 2

Source IP : 192.168.1.100/32 Destination IP : 192.168.1.200/32

IP Protocol : TCP IP ToS Bits : 0

Source Port : 0 Destination Port : 0

Priority : 65535 Cookie : 0

Duration : 3 seconds

Idle Timeout : 10 seconds Hard Timeout : 30 seconds

Packet Count : 3582 Byte Count : 229248

Flow Location : Software

Actions

Output : 2

Flow 2

Incoming Port : 2 Ethernet Type : IP

Source MAC : 000006-2cc01e Destination MAC : 000006-2cb437

VLAN ID : 100 VLAN Priority : 2

Source IP : 192.168.1.200/32 Destination IP : 192.168.1.100/32

IP Protocol : TCP IP ToS Bits : 0

Source Port : 0 Destination Port : 0

Priority : 65535 Cookie : 0

Duration : 3 seconds

Idle Timeout : 10 seconds Hard Timeout : 30 seconds

Packet Count : 3588 Byte Count : 229632

Flow Location : Software

Actions

Output : 1

Re: HP 2920-24G w/ POX Controller

Jason_Hughes — Fri, 18 Oct 2013 17:34:06 GMT

Much thanks for conducting a seperate test and sorry for my taking so long to retest and post results. Friday is pretty much my only day right now to work on this.

Anyway, setup my lab again and documented everything much better than last. Realized that I have something configured incorrectly regarding vlans and port membership. Found that the ARP requests from PC-1 were making it through the switch to PC-2 however, they contained 802.1Q VLAN information in the frame, for which PC-2 doesn't know how to respond.

# Steps to configure HP 2920 OOBM port
config
oobm
enable
ip address 192.168.0.2/24
ip default-gateway 192.168.0.1
end
write mem

# Confirm oobm status
ping 192.168.0.1 source oobm
>192.168.0.1 is alive, time = 4 ms

show oobm ip
>IPv4 Status    : Enabled
>IPv4 Default Gateway    : 192.168.0.1
>
>Member | IP Config IP Address/Prefix Length   Address Status   Interface Status
>------ | --------- ------------------------   --------------   ----------------
>Global | manual     192.168.0.2/24                              Up

show oobm
>Global OOBM Configuration
>OOBM Enabled           : Yes
>OOBM Port Type         : 10/100TX
>OOBM Interface Status : Up
>OOBM Port              : Enabled
>OOBM Port Speed        : Auto
>MAC Address            d4c9ef-a56141

# Steps to configure OpenFlow on HP 2920 switch.
config
openflow
enable
controller-id 1 ip 192.168.0.1 controller-interface oobm
instance aggregate mode active
instance aggregate connection-interruption-mode fail-standalone
instance aggregate controller-id 1
instance aggregate enable
end
write mem

#HP-2920-24G# show config

Startup configuration: 3

; J9726A Configuration Editor; Created on release #WB.15.13.0003
; Ver #04:e3.ff.35.0d:20

hostname "HP-2920-24G"
module 1 type j9726a
snmp-server community "public" unrestricted
openflow
   enable
   controller-id 1 ip 192.168.0.1 controller-interface oobm
   instance aggregate
      controller-id 1
      connection-interruption-mode fail-standalone
      enable
      exit
   exit
oobm
   ip address 192.168.0.2 255.255.255.0
   ip default-gateway 192.168.0.1
   exit
vlan 1
   name "DEFAULT_VLAN"
   untagged 1-24,A1-A2,B1-B2
   ip address dhcp-bootp
   exit

# Steps to show OpenFlow status
show openflow
>OpenFlow Version 1.0
>
>OpenFlow    : Enabled
>Max. Policy Engine Usage (%) : 50
>Hardware Stats. Refresh Rate : 20 seconds
>
>Instance Information
>
>Instance Name   Oper. Status No. of H/W Flows No. of S/W Flows
>-------------- ------------ ---------------- ----------------
>aggregate       Up            0                 0

show openflow instance aggregate
>
>Instance Name            : aggretate
>Admin. Status            : Enabled
>Member List              : VLAN 1
>Listen Port              : None
>Oper. Status             : Up
>Datapath ID              : 1000d4c9efa56140
>Mode                     : Active
>Flow Location            : Hardware and Software
>No. of Hw Flows          : 0
>No. of Sw Flows          : 0
>Hw. Rate Limit           : 0 kbps
>Sw. Rate Limit           : 100 pps
>Conn. Interrupt Mode     : Fail-Standalone
>Maximum Backoff Interval : 60 seconds
>Probe Interval           : 10 seconds

# POX Controller Syntax
./pox.py log.level --DEBUG openflow.debug forwarding.l2_pairs
>POX 0.2.0 (carp) / Copyright 2011-2013 James McCauley, et. al.
>INFO:forwarding.l2)pairs:Pair-Learning switch running.
DEBUG:core:POX 0.2.0 (carp) going up...
DEBUG:core:Running on CPython (2.7.3/Apr 10 2013 05:46:21)
DEBUG:core:Platform is Linux-3.8.0-29-generic-i686-with-Ubuntu-12.04-precise
INFO:core:POX 0.2.0 (carp) is up.
DEBUG:openflow.of_01:Listening on 0.0.0.0:6633
INFO:openflow.of_01:[d4-c9-ef-a5-61-40|4096 1] connected

# PCAP on POX Controller
192.168.0.1 > 192.168.0.2 TCP 62 6633 > 49780 [ACK] Seq=1 Ack=1 Win=1 Len=8
192.168.0.2 > 192.168.0.1 TCP 62 49780 > 6633 [ACK] Seq=1 Ack=9 Win=1 Len=8
192.168.0.1 > 192.168.0.2 TCP 62 6633 > 49780 [ACK] Seq=9 Ack=9 Win=1 Len=8
192.168.0.2 > 192.168.0.1 TCP 230 49780 > 6633 [ACK] Seq=9 Ack=17 Win=1 Len=176
192.168.0.1 > 192.168.0.2 TCP 66 6633 > 49780 [ACK] Seq=17 Ack=185 Win=1 Len=12
192.168.0.1 > 192.168.0.2 TCP 126 6633 > 49780 [ACK] Seq=29 Ack=185 Win=1 Len=72
192.168.0.1 > 192.168.0.2 TCP 62 6633 > 49780 [ACK] Seq=101 Ack=185 Win=1 Len=8
192.168.0.2 > 192.168.0.1 TCP 62 49780 > 6633 [ACK] Seq=185 Ack=109 Win=1 Len=8
<repeats with cooresponding TCP sequencing and acknowledgements>

# Running ping from PC-1 to PC-2 w/no knowledge of PC-2 MAC
ping 172.20.1.101
PING 172.20.1.101 (172.20.1.101) 56(84) bytes of data.
From 172.20.1.100 icmp_seq=2 Destination Host Unreachable
From 172.20.1.100 icmp_seq=3 Destination Host Unreachable
<repeats with sequencial sequencing>

# PCAP on PC-2
<receives periodic LLDP Multicast MSGs from Switch>
<receives the following ARP Requests>
08:00:27:bb:ad:fb > Broadcast ARP 64 Who has 172.20.1.101 Tell 172.20.1.100
<ARP messages have VLAN info in them as follows>
802.1Q Virtual LAN, PRI: 0, CFI: 0, ID: 1
<once I stop the POX controller, switch reverts to standalone, VLAN info is gone>
<PC-2 now responds to ARP requests>

Re: HP 2920-24G w/ POX Controller

Jason_Hughes — Fri, 18 Oct 2013 17:41:55 GMT

Was your test with the POX controller connected in-band on port 48 and placed into a different VLAN? From what I remember with VLANS, once you create any additional VLANS beyond the default "vlan 1", all nodes in vlan 1 will no longer work. So, do I need to move the nodes I want as part of the OF instance to a new vlan and does the OOBM port also require its own vlan?

Will test some of this out as well.

thanks,
jason

Re: HP 2920-24G w/ POX Controller

weiming — Fri, 18 Oct 2013 21:13:38 GMT

Hi Jason, can you rerun the “show openflow instance aggregate” command? Thanks.

Re: HP 2920-24G w/ POX Controller

Jason_Hughes — Sat, 19 Oct 2013 02:26:26 GMT

Certainly. With the switch connected to the controller via the switches OOBM port and keep alive TCP MSGs back and forth, pinging from PC-1 to PC-2, PC-2 sees the ARP request from PC-1 with VLAN data in the frame. Only one VLAN configured on the switch "default vlan" with all ports listed as untagged.

result of "show openflow instance aggregate":

Instance Name : aggregate

Admin. Status : Enabled

Member List : VLAN 1

Listen Port : None

Oper. Status : Up

Datapath ID : 1000d4c9efa56140

Mode : Active

Flow Location : Hardware and Software

No. of Hw Flows : 0

No. of Sw Flows : 0

Hw Rate Limit : 0 kbps

Sw Rate Limit : 100 pps

Conn. Interrupt Mode : Fail-standalone

Maximum Backoff Interfal : 60 seconds

Probe Interval : 10 seconds

Controller ID Connection Status Connection State

-------------- ------------------- -------------------

1 Connected Active

Seems interesting that even after configuring the port as OOBM, it list the Listen Port as None vice OOBM, and watching the messages at the controller with wireshark, can see clearly the switch is communicating on the default port 6633.

Jason

Re: HP 2920-24G w/ POX Controller

Jason_Hughes — Sat, 19 Oct 2013 06:39:35 GMT

Had a chance to remote into my lab and do some additional testing. With the previous configuration as above, I was setting this up as an aggregate, which means that all vlans participate in a single OF instance (less the management and controller vlan). Whether I had the 2 ports (#1 and #2) configured in vlan 1 or vlan 100, they would be under the aggregate instance. Hence I could not remove any vlan from that instance listing. So configured with just the default vlan and controller interfaced on the OOBM port, all ports "untagged", when an ARP was sent from one node to another on the switch, it appears as though the switch is actually including tagging information as previously indicated a couple post up. Just for kicks I changed them to "tagged" and ping'd and no ARP's would go through. Changed the ports back to "untagged" and the ARP message would go through again, but since the switch added the vlan tag information, the node receiving the ARP request did not respond as it didn't know how to interrupt the VLAN tag in the frame.

So, I tore down the instance aggregate, built vlan 100, added ports #1 and #2 as untagged (because it changed them to tagged for some reason), kept the controller on the OOBM port as previously configured, and built a non-aggregate instance as follows:

# Steps to configure OpenFlow instance OFLAB on HP 2920 switch
config
openflow
enable
controller-id 1 ip 192.168.0.1 port 6633 controller-interface oobm
instance OFLAB mode active
instance OFLAB connection-interruption-mode fail-standalone
instance OFLAB controller-id 1
instance OFLAB member vlan 100
instance OFLAB enable
end
write mem

To my surprise, PC-1 was able to successfully ARP for the MAC of PC-2 and exchange icmp echo/echo-replies!!!

This is good as I can continue in this configuration for customizing the POX controller for my thesis work, but leaves me still wondering what the issue is with running in aggregate mode. Potential software bug or just an issue with my load???

Jason

Re: HP 2920-24G w/ POX Controller

Jason_Hughes — Sat, 19 Oct 2013 06:48:29 GMT

Forgot to add the outputs of openflow:

#show openflow

>OpenFlow Version 1.0

>OpenFlow : Enabled

>Max. Policy Engine Usage (%) : 50

>Hardware Stats. Refresh Rate : 20 seconds

Instance Information

Instance Name Oper. Status No. of H/W Flows No. of S/W Flows

------------------------------------------------------------------------------

oflab Up 0 2

#show openflow instance oflab

>Instance Name : oflab

>Admin. Status : Enabled

>Member List : VLAN 100

>Listen Port : None <because it is using the default 6633>

>Oper. Status : Up

>Datapath ID : 0064d4c9efa56140

>Mode : Active

>Flow Location : Hardware and Software

>No. of Hw Flows : 0

>No. of Sw Flows : 2

>Hw. Rate Limit : 0 kbps

>Sw. Rate Limit : 100 pps

>Conn. Interrupt Mode : Fail-Standalone

>Maximum Backoff Interval : 60 seconds

>Probe Interval : 10 seconds

Controller ID Connection Status Connection State

---------------------------------------------------------

1 Connected Active

Re: HP 2920-24G w/ POX Controller

Jason_Hughes — Fri, 25 Oct 2013 23:08:52 GMT

Still haven't resolved getting an out-of-band controller to work with the switch in an aggregate instance, so certainly looking for any feedback if anyone has had success in this specific configuration.

Thanks!
Jason

Re: HP 2920-24G w/ POX Controller

dave_tucker — Fri, 25 Oct 2013 23:40:14 GMT

I've just taken a look at the HP OpenFlow Switch's Adminstrator's Guide

Have a read of p20, Configure Listener Ports.

I think the following command added to your OpenFlow instance should fix your configuration:

listen-port 6633 oobm

Let me know how you get on.

Hope this helps!

-- Dave

Re: HP 2920-24G w/ POX Controller

Sahil-Shah — Thu, 14 Nov 2013 19:23:22 GMT

Hi All,

We just procured two HO2920-24G switches and I have to setup a two node network with single host each[all physical connections] to controlled by a controller[Floodlight or POX].

Please update me on what should be my topology:

I am thinking of:

PC1------------------Switch 1---------------------Switch2-------------------------Pc2

PC running controller

My Questions:

1. Is this topology correct?

2. Do we require any physical connection between the controllers and the switches? Controller PC, Switch 1, Switch 2 are in same subnet i.e. getting internet connections from the same hub.

3. Do I need to configure VLAN's as done above in this case?

I am new to the networking world. Please bear with me.

Thanks

Sahil

Re: HP 2920-24G w/ POX Controller

EricAtHP — Thu, 14 Nov 2013 20:53:42 GMT

Hi Sahil,

That topology will work. I recommend that you use two VLANs. For example, VLAN 1 could be used for the controller connection and VLAN 2 could be OpenFlow controlled. You would then tag both VLANs on the interswitch link.

By the way, you can now download the HP controller from: https://h10145.www1.hp.com/downloads/DownloadSoftware.aspx?SoftwareReleaseUId=10608&ProductNumber=J9863AAE&lang=&cc=&prodSeriesId=&SerialNumber=&PurchaseDate=

Here is what the configuration might look like for one of the switches. This config assumes that the controller would connect to port 1 or 2 and that the interswitch link is port 24.

hostname "HP2920"
openflow
controller-id 1 ip 192.168.1.100 controller-interface vlan 1
instance "Testing"
member vlan 2
controller-id 1
enable
exit
enable
exit
oobm
ip address dhcp-bootp
exit
vlan 1
name "Controller"
no untagged 3-24
untagged 1-2

tagged 24
ip address 192.168.1.10 255.255.255.0
exit
vlan 2
name "OpenFlow"
untagged 3-23

tagged 24
no ip address
exit

Good luck,

Eric

Re: HP 2920-24G w/ POX Controller

zefanya_ — Fri, 09 Mar 2018 07:25:11 GMT

why i'cant ping h1 to h2 output ping is unreachable? can you help me for configuration openflow?

port 1 controllet to switch

port 2 and 3 host to switch