PEO (25th June 2009)
does anyone have a rough idea how much it would cost for OM3 cable per meter?
Pre Terminated Fibre Optic Cable, Multi & Single Mode Cables
Multi Mode 50/125 4 Core Tight Buffered, Internal/External, LSZH, per metre
£0.73 base price & £0.73 for each subsequent metre.
Multi Mode 50/125 8 Core Tight Buffered, Internal/External, LSZH, per metre
£1.24 base price & £1.24 for each subsequent metre.
in Pre terminated stuff that you can pull through yourself looks like about £150 to terminate 8 core.
Last edited by SYNACK; 25th June 2009 at 03:42 PM.
On 10Gb it's not the fibre cable that costs much but the network switches and fibre modules. To be honest with the size of network indicated by the number of switches on the diagram you probably won't need 10Gb.
Link agregate your servers directly into the core switch and replace your copper links with fibre and use link aggregation to either 2Gb or 4Gb on the fibres with more than one switch attached.
If you are pulling any new fibre, 10Gb fibre is hardly any dearer so pull that through for future upgrades and get at least 8 core so you can do as much link agg as possible.
ooops did again forgot to add diagram
Looking good, much less traversal of switching and much better core access for the servers. This setup would be a definite improvement over the existing one.Depending on how smart your switches are I would look at implementing STP on them and adding additional copper links between the swiches in the same cabinet making sure that the core is the master switch. This way it will give you redundancy by chopping over to the other switch in the cabinet if a single fiber goes out. This link would not be active at any other time other than if the main links failed. This gives you continuity in the network with only a small window of downtime.Ideally you want to be planning for additional links/faster links in future but the system above would be a vast improvement. One thing that I would say is to never give the impression that this is the last penultimate upgrade. There will always be more stuff that will come along and be required so be sure to convey to the powers that control the money flow that this is just one very positive step along the journy of good IT.
Very interesting read so far, I have some questions if someone would be kind enough to answer
At the moment my core switches are layer 2 just linked together with no real rhyme or reason with severs plugged into different switches along with random network sockets around the school ( inherited network). I wish to improve this because as we have expanded, the network has begun to slow down.
At the moment servers go into one of the core switches which link to outlying layer 2 switches and then feed out to the sockets, most of these links are single fibre links with some being cat 5e. All the fibe is gig with gig media converters at each end and all have redundant pairs.
Am I right in taking the following approach to improve my network structure or have I misunderstood points of this thread.
I want to have a single 48 - port Layer 3 core switch.
Into this switch I will plug all my main fibre links using link aggregation and utilising the redundant pairs to form a 2 gig fibre backbone. I would also utilise bonding the dual network connections on my main servers to increase throughput and put those into the layer 3 core switch as well. Non main servers would go into the core switch as a single connection. This would use up 35 of the 48 available ports.
All outlying switches would be Layer 2 and then feed to the rooms.
Does this sound right?
Also if I connect other layer 2 swicthes that are in my main cabinet to the core switch would I connect them in with a single cat5 cable or should they be trunked in as well?
I was thinking of this switch as my core?
Support for 3Com® Switch 5500G-EI 24-Port (3CR17250-91) - Features & Benefits
Thanks in advance
Last edited by Disease; 26th June 2009 at 02:28 PM.
I can't vouch for the quality or not of the hardware itself as I have not dealt with the 3com stuff for quite a while but it does look like a solid building block to build your network around.
In the future if they changed to a different type of switch for the core or one with a different stacking interface I would recommend that they keep the stack together as it will behave very simmilar to a single switch and just aggregate a whole bunch of links from the new core onto the stack master. This would use far less ports than trunking to each and the stacking internals are usually much better at handleing through traffic due to their optimized interface and software.
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