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Wired Networks Thread, Upgrading our netgear switches to HP, what to buy? in Technical; I'm just about to start upgrading our netgear GS724T switches around school with HP stuff but not sure what to ...
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    zag
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    Upgrading our netgear switches to HP, what to buy?

    I'm just about to start upgrading our netgear GS724T switches around school with HP stuff but not sure what to buy.

    I am looking to create VLANs at some point and we need some POE ports as well for our wireless AP's

    So what HP switch should I go for?

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    Mr.Ben's Avatar
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    How many clients do you have?

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    zag
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    Around 800

    I forgot to say I would also like silent/quiet switches as we have a few in classrooms.

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    The switching capacity on the Netgear GS724T is really low - 48Gbps for a 24 port gigabit switch!

    I've installed quite a number of HP 2910 and HP 2920 48 port switches with PoE/PoE+. These have a switch capacity of 176Gbps to give you a comparative. They're not silent, but they're not really noisey either

  5. 2 Thanks to Michael:

    MGSTech (28th January 2014), zag (21st January 2014)

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    sonofsanta's Avatar
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    I would say the HP-A5120 (rebranded 3COM) switches are perfectly capable devices - JG237A is the PoE 48 port model - but they're not silent (though three of them in the cab two foot from me is only a quiet whoosh of air).

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    zag
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    I spoke to HP yesterday at BETT and they recomended the HP 2530 Switch Series. Any thoughts on that?

    HP 2530 Switch Series

    c03531350.png

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    Ive got a few of the 2530 series and they are decent switches. You wont go wrong with them for setting up vlans for wireless. With these you can do all the configuration via a telnet session unlike some of the cheaper hp switches.
    Last edited by timbo343; 24th January 2014 at 11:14 AM.

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    zag (24th January 2014)

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    The HP (ex 3com) v1910 switches are pretty good. They are cheap and really reliable. Never had a problem with them.

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    V1910 POE series are not quiet. I've got lots of V1910-24-POE+ and they're pretty loud.

    I've got some 2530 48G POE+ on the way so it'll be interesting to see if they're quieter or louder than the V1910s.

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    zag
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    Quote Originally Posted by AButters View Post
    V1910 POE series are not quiet. I've got lots of V1910-24-POE+ and they're pretty loud.

    I've got some 2530 48G POE+ on the way so it'll be interesting to see if they're quieter or louder than the V1910s.
    Yes please do report back, the specs say they are 55 decibels loud and the netgears are 45. Will be very interesting to know.

    Interestingly the 48 port netgear switches are very loud also. The 24 port is silent. God knows what the POE versions are like!

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    HP V1910, 3Com 2928/2952, H3C S5120-SI, HP A5120-SI switches do have a software limit of 256 ARP entries. Those will not be the right choice for you.

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    Quote Originally Posted by zag View Post
    the specs say they are 55 decibels loud and the netgears are 45.
    If you are going to compare db, just be aware that 10db difference is about doubly as loud (as humans perceive it),
    here has some good comparison - Sound Proofing Walls: How Sound is Measured - Welk and Sons Drywall

    As it's a logarithmic scale two devices of 45db will be 48db, 4 devices will be 51db, 8 will be 54...

    According to an american body, "According to ASHA, ambient noise should be no louder than 30-35 decibels in an empty room." quote from Enhanced Classroom Hearing - Poor Acoustics.

    Just FYI.

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    I would avoid the v1910 switches like the plague. They are not true HP switches but re-badged 3COM. IF you mess the IP address up I found I could not find the address out with a fluke tester like I could on proper managed switches (these are Smart switches). I found that I had to dig out the only XP laptop with a serial port just to be able to set up a telnet type session using a 9 pin serial lead to talk to the switch(forgotten the name but it was only there on XP). What a pain! Also the switch came with DHCP turned on and killed my network ( I was not expecting this and wondered why some of my other switches stopped working - be careful with this, you should only have one DHCP server on the same subnet). I did not want these switches (but was forced to buy them by the SLT on the advice of a consultant because they were a bit cheaper) because setting up VLAN's on managed switches is so much easier and you can telnet, web manage or use a command line to access them. Every little change to the switch is down via web browser and you have to wait a few seconds for the web page to update - it just takes ages to do.

    One other major drawback is that they are noisier than the layer2 managed switches and they are enormous. I found I could not actually fit one into an existing wall cabinet which meant I had to change the cabinet just to install it! Check the measurements carefully these switches are twice the size of modern ones. You will be buying old stock when you buy these since 3COM were bought out a number of years ago.

    I could go on, but I think you can tell I would only use these for one thing - as a weight keeping the server door open as I take boxes in and out!
    Last edited by Dantech; 25th January 2014 at 12:25 AM.

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    +1 for the HP 2920, we bought 14 of these babys. Class so far!!

    Perfect complement to our ruckus wifi and HP 5406zl cores.

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    Quote Originally Posted by Dantech View Post
    ...
    - 256 arp limit is only an issue if the switch is doing resolution, which it typically wont be as an edge switch. the only entries it will typically ever contain will be that of any device you use to manage it, an NTP server and a router. it's not a core switch, so dont use it for routing vlanned interfaces in large networks and you wont have ARP problems. use a cisco 3560x, HP A5800 etc for intervlan routing.

    - these switches do not come with a dhcp server enabled on them

    - the serial interface is o/s independant

    - if you 'mess' the ip - then just reset it via the console to factory defaults, or just _cmdline-mode on / 512900 and set the IP again.

    - 'smart' and 'managed' switches are just marketing BS.

    - you won't be buying old stock, new HP V1910's are still being made today, yes - they're just rebadged 2952's ala software restricted(and for the most part unlockable) 5120SI's

    - noise, for their generation they're on par with the noise of other switches with similar feature sets. size wise - the 24/48 ports are tiny, any PoE model will be large and noisier due to the amount of heat generated.
    Last edited by tensop; 25th January 2014 at 07:48 AM.

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