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Wired Networks Thread, New Switches - Advice in Technical; I'm looking at replacing most of my switches in the cabs around the school. I'm looking at the HP Pro ...
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    DSapseid's Avatar
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    New Switches - Advice

    I'm looking at replacing most of my switches in the cabs around the school. I'm looking at the HP Pro Curve ones as i already have a few in place.

    I'm looking for the below:
    48 Port switch with Fibre - or a 24 port switch with fibre and 24 port without and link them together - if cheaper!
    24 Port switch with Fibre

    Can anyone recommend any good ones as there seem to be so many and i get a bit lost with all the different types of HP switches!

    Thanks.

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    cpjitservices's Avatar
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    HP switches are great!! I'd have a look on the internet and see which ones would suit your needs best, then get a quote from HP and I believe they have a lifetime warranty.

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    Millgate's Avatar
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    Hi,

    I've dropped some info over on a PM. HP ProCurve Switch 2510G-48 would be a good option!

    Cheers

    Luke

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    Diello's Avatar
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    I'd agree with the 2510-48 - However, Only go for the 2510G if you need gigabit to the desktop. The price differential is quite substantial.

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    zag
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    Do these HP switches prevent loopbacks in the network?

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    Quote Originally Posted by zag View Post
    Do these HP switches prevent loopbacks in the network?
    Yes once you've enabled spanning tree protocol.

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    I would take a look at the HP A series.. The HP A5120 series would be a good choice....they run comware instead of provision OS.

    bio..

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    zag
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    Quote Originally Posted by K.C.Leblanc View Post
    Yes once you've enabled spanning tree protocol.
    Is there any downside to enabling this?

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    Quote Originally Posted by Diello View Post
    I'd agree with the 2510-48 - However, Only go for the 2510G if you need gigabit to the desktop. The price differential is quite substantial.
    What one would be the one without gigabit to desktop just so i can have a look at price comparison. Although am looking at running thinclient accross the site so gigabit would be beneficial there.

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    Millgate's Avatar
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    Hi,

    I've just PM'd a price for the HP ProCurve Switch 2510-48.

    Cheers

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    Quote Originally Posted by zag View Post
    Is there any downside to enabling this?
    That depends on the rest of your infrastructure. STP adds overhead to every packet that travels along an STP enabled route.
    If every port on every switch has STP enabled then every packet will have an undesirable overhead.
    In some conditions such as large file transfer rates or streaming this could cause packet loss but your unlikely to ever be able to tell if STP was the cause without advanced diagnostic tools.

    STP (or RSTP nowadays) is used to determine if a packet has already passed through a switch port once already.
    We commonly configure loops in our network to provide redundancy, with kilometers of cable and fibre and a prolific rodent population chomping through cables is a regular occurance.

    STP holds one section of the loop down (Blocking) so if a Rat chews through a cable elsewhere the system will unblock the unwanted loop and allow packets to pass keeping your network running which is the complete opposite of why many people invoke it on this forum.
    Vital if your running VoiP on your VLans!

    So the $64,000 question should you enable STP on all of your switches as a defence against kids looping a wall socket out?

    IMOHO, No. It serves very little purpose adds overhead where its un-necessary and is unlikely to help as the entire switch is likely to block all ports in such a scenario until it either resets of its own accord which can take several minutes to happen or until the NM shuts everything down and restarts his network!

    Enabling STP on anything other than a redundant link is likely to make diagnosing the real cause of your outage harder rather than easier.

    I would prefer to just shoot the child through the head that created the loop as we do with the vermin that eat my cables....

  12. Thanks to m25man from:

    zag (21st June 2011)

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    Procurve has a loop guard feature that can be enabled to prevent loops on edge ports. So i'd enable it. Also spanning tree doesn't add overhead to every packet but it does send some additional frames called BPDUs although these won't effect network performance. Generally you should enable both spanning tree and loop guard.

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    Quote Originally Posted by DSapseid View Post
    What one would be the one without gigabit to desktop just so i can have a look at price comparison. Although am looking at running thinclient accross the site so gigabit would be beneficial there.
    Speaking purely retail (obviously nice discounts to be had for education!):

    The HP E2510-48 (J9020A) goes for £455
    The HP E2510-48G (J9280A) goes for £1,201

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    Quote Originally Posted by Diello View Post
    Speaking purely retail (obviously nice discounts to be had for education!):

    The HP E2510-48 (J9020A) goes for £455
    The HP E2510-48G (J9280A) goes for £1,201
    I know you were just talking retail pricing but just though i'd let you know we have these in stock at:

    2510G-48 - £800
    2510-48 - £330

    So you don't want to be paying more than that really

    Cheers

    Luke

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    Interesting... Can you guys get your hands on the E5406 range as well...?

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