Hi Patrick Install the latest version of firmware or software must always be one of the first steps to run at a resolution of problems, especially in those cases where the logic does not make sense. In general is resolved fairly quickly, if the solution was well implemented. Keep all the devices in the network on the same version is another important thing.
Raúl Carbonari From: Patrick Printz <[email protected]> To: "Enterasys Customer Mailing List" <[email protected]> Date: 11/10/2013 12:09 p.m. Subject: RE: [enterasys] Avaya IP phone subnet size Just to provide some follow-up on this issue, we may have found a resolution. The network was determined to not be the cause of the problem after presenting evidence to back my claims. The vendor informed us that our voice network being on a /16 (which I know is too big, but didn’t want to go through the pain of shrinking it while rushed by a major issue) was the cause of the problem. They said a /23 would fix things, but we would still have the same number of hosts on that subnet. BTW, thanks to John M. in GTAC for his help in the troubleshooting. Through wireshark(such an awesome tool) traces on the vlan and capturing traces of phone calls while the issue occurred, we were able to prove that · The 400 hosts on the voice subnet were not generating more than 10p/s of broadcast traffic · The data network was not spiking and hogging the pipe · CoS was being applied, but did not even come in to play. · The switches from the edge to the data center had no errors for the ports used by the phone or servers. · The call was clearly garbled during the call, but not when played back in the wireshark trace This all pointed to something on the phone itself. This led us to installing the latest firmware for the phones and the servers, which earlier on was deemed as not necessary. It is day two of having the new firmware installed, and the phones seem to be happy. I am still cautiously optimistic. Just wanted to share the results should the information benefit someone else. Patrick Printz Network Infrastructure Quinsigamond Community College 670 West Boylston Street Worcester, MA 01606-2092 w. 508-854-7517 c. 508-726-9529 When technology fails you, just call the help desk. (x4427/[email protected]) "If a man is called a street sweeper, he should sweep streets even as Michelangelo painted, or Beethoven composed music, or Shakespeare wrote poetry. He should sweep streets so well that all the hosts of heaven and Earth will pause to say, Here lived a great street sweeper who did his job well." ~Martin Luther King, Jr. From: Patrick Printz [mailto:[email protected]] Sent: Tuesday, October 08, 2013 9:27 AM To: Enterasys Customer Mailing List Subject: RE: [enterasys] Avaya IP phone subnet size That is what I thought, just was making sure. Honestly, that is just a PITA. I know it is how it is, but I would think that after so many years of networks existing that we would be in a better situation. Very frustrating. Patrick Printz Network Infrastructure Quinsigamond Community College 670 West Boylston Street Worcester, MA 01606-2092 w. 508-854-7517 c. 508-726-9529 When technology fails you, just call the help desk. ( x4427/[email protected]) "If a man is called a street sweeper, he should sweep streets even as Michelangelo painted, or Beethoven composed music, or Shakespeare wrote poetry. He should sweep streets so well that all the hosts of heaven and Earth will pause to say, Here lived a great street sweeper who did his job well." ~Martin Luther King, Jr. From: Robert Kwiatkowski [mailto:[email protected]] Sent: Tuesday, October 08, 2013 9:12 AM To: Enterasys Customer Mailing List Cc: Enterasys Customer Mailing List Subject: RE: [enterasys] Avaya IP phone subnet size Typically I see one VLAN ID (VID) per subnet. For troubleshooting purposes some use a piece of the network address for the VID. However, the same VID can be used for all subnets if they are separated by layer 3 segments and not on the same switch. Rob Kwiatkowski | Solutions Engineer, Upstate and Western NY Enterasys Networks Cell: 518.378-5177 Email: [email protected] ”There is nothing more important than our customers.” ----- Original Message ----- From: Patrick Printz <[email protected]> To: Enterasys Customer Mailing List <[email protected]> Sent: 10/8/2013 8:53 AM Subject: RE: [enterasys] Avaya IP phone subnet size So you are saying just 1 voice vlan with multiple subnets? Because I was told each subnet needed its own VLAN. Patrick Printz Network Infrastructure Quinsigamond Community College 670 West Boylston Street Worcester, MA 01606-2092 w. 508-854-7517 c. 508-726-9529 When technology fails you, just call the help desk. (x4427/ [email protected]) "If a man is called a street sweeper, he should sweep streets even as Michelangelo painted, or Beethoven composed music, or Shakespeare wrote poetry. He should sweep streets so well that all the hosts of heaven and Earth will pause to say, Here lived a great street sweeper who did his job well." ~Martin Luther King, Jr. From: Robert Kwiatkowski [mailto:[email protected]] Sent: Tuesday, October 08, 2013 8:01 AM To: Enterasys Customer Mailing List Subject: RE: [enterasys] Avaya IP phone subnet size Hi Patrick, Here are some of my thoughts for what they’re worth. J Let me know if they help. I am wondering if anyone else who is running a Avaya IP Phones on their network have limited their voice vlan size? I am being told by a telecom vendor that the Avaya phones should reside on a subnet no larger than a /24. Can anyone else confirm or deny this? I managed an enterprise Avaya phone system at Hudson Valley Community College for 4 years, 2008-2012. I believe the recommendation behind smaller subnets is truly best practice going back a ways for broadcast issues in the past. This is still true today as devices have to process every broadcast. I would still try and keep subnet sizes to /24 or as close as you can get to it that makes sense for your network topology. I used /24 and /23 subnets – by: geographical location, building by building, floor by floor, port counts needed for each area. Having a separate VLAN for just VOIP is also recommended by Avaya. We are experiencing jitter on our phones and the CoS configuration on the network side looks fine. Two things here – · Since your routed, are you assigning QoS? CoS operates only on 802.1Q VLAN Ethernet at the data link layer (layer 2), while other QoS mechanisms (such as DiffServ, also known as DSCP) operate at the IP network layer (layer 3) · Jitter issues are usually due to either slow or heavily congested links. I would try to find out what link/s may be causing the issue; try and upgrade the bandwidth where necessary. In summary, I think if you have CoS and QoS configured properly; you address the congested link/s, you’ll solve the problem. Thanks, Rob Kwiatkowski Solutions Engineer, Upstate and Western NY Enterasys Networks Cell: 518.378-5177 Email: [email protected] ”There is nothing more important than our customers.” From: Patrick Printz [mailto:[email protected]] Sent: Tuesday, October 08, 2013 6:43 AM To: Enterasys Customer Mailing List Subject: RE: [enterasys] Avaya IP phone subnet size No routing at the edge currently. The phones Mac auth and get the proper role, which assigns the vlan and CoS. Patrick Printz Network Infrastructure Quinsigamond Community College 670 West Boylston Street Worcester, MA 01606-2092 w. 508-854-7517 c. 508-726-9529 When technology fails you, just call the help desk. ( x4427/[email protected]) "If a man is called a street sweeper, he should sweep streets even as Michelangelo painted, or Beethoven composed music, or Shakespeare wrote poetry. He should sweep streets so well that all the hosts of heaven and Earth will pause to say, Here lived a great street sweeper who did his job well." ~Martin Luther King, Jr. From: John Kaftan [mailto:[email protected]] Sent: Monday, October 07, 2013 10:19 PM To: Enterasys Customer Mailing List Subject: Re: [enterasys] Avaya IP phone subnet size We just deployed an Avaya IP office system too. I cannot confirm or deny whether it is necessary but we went with a seperate vlan per building for voip. For us this means way less than a /24 per building. Although that is how we setup our subnets. We have NAC and we assign a Phones policy with a cos of 6 I believe. No problems. Are you routing at the edge? How so you assign Cos? John On Oct 7, 2013 9:53 PM, "Patrick Printz" <[email protected]> wrote: I am wondering if anyone else who is running a Avaya IP Phones on their network have limited their voice vlan size? We are experiencing jitter on our phones and the CoS configuration on the network side looks fine. I am being told by a telecom vendor that the Avaya phones should reside on a subnet no larger than a /24. Can anyone else confirm or deny this? Patrick Printz Network Infrastructure Quinsigamond Community College 670 West Boylston Street Worcester, MA 01606-2092 w. 508-854-7517 c. 508-726-9529 When technology fails you, just call the help desk. (x4427/ [email protected]) "If a man is called a street sweeper, he should sweep streets even as Michelangelo painted, or Beethoven composed music, or Shakespeare wrote poetry. 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