Comments on: Unlocking CISCO devices to work with “unsupported” SFP http://www.kuncar.net/blog/unlocking-cisco-devices-to-work-with-unsupported-sfp/2008/ Sat, 03 Dec 2011 23:57:52 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Dan http://www.kuncar.net/blog/unlocking-cisco-devices-to-work-with-unsupported-sfp/2008/comment-page-1/#comment-712 Dan Thu, 07 Jul 2011 20:40:25 +0000 http://www.kuncar.net/blog/?p=24#comment-712 Thanks! Thanks!

]]> By: tnk http://www.kuncar.net/blog/unlocking-cisco-devices-to-work-with-unsupported-sfp/2008/comment-page-1/#comment-696 tnk Thu, 09 Jun 2011 09:48:19 +0000 http://www.kuncar.net/blog/?p=24#comment-696 I though that would be the case as you should never need those commands for the cisco's own SFPs - the problem will be more likely that the switch just cannot support this type of modules in HW/IOS (or that the SFPs are faulty which i think is quite unlikely) anyway the supported types should be listed somewhere in documentation for the 3750 switch. Sorry i couldn't help you any more than this... BR I though that would be the case as you should never need those commands for the cisco’s own SFPs – the problem will be more likely that the switch just cannot support this type of modules in HW/IOS (or that the SFPs are faulty which i think is quite unlikely) anyway the supported types should be listed somewhere in documentation for the 3750 switch.
Sorry i couldn’t help you any more than this…
BR

]]> By: hzahiri http://www.kuncar.net/blog/unlocking-cisco-devices-to-work-with-unsupported-sfp/2008/comment-page-1/#comment-695 hzahiri Thu, 09 Jun 2011 08:13:19 +0000 http://www.kuncar.net/blog/?p=24#comment-695 Thank you for your response, I confirm we use the Cisco modules and I have used the commands of your articles and i do not receive the message error that I have mentionned but the port is always down, it does not recognize the module. BR Thank you for your response, I confirm we use the Cisco modules and I have used the commands of your articles and i do not receive the message error that I have mentionned but the port is always down, it does not recognize the module.
BR

]]> By: tnk http://www.kuncar.net/blog/unlocking-cisco-devices-to-work-with-unsupported-sfp/2008/comment-page-1/#comment-694 tnk Wed, 08 Jun 2011 22:24:26 +0000 http://www.kuncar.net/blog/?p=24#comment-694 You can use those commands from the article as they are harmless no matter what the message says (and you can always remove them later from the configuration if you want). The only thing they do is that they disable the automatic check of the SFP and subsequent move of the port into err-disabled state. So if you say that the port does support the speed then it should be no problem. I am just wondering - are you using cisco (certified) SFP or some other vendor's ? As if you use certified SFP I wouldn't expect this sort of behavior... You can use those commands from the article as they are harmless no matter what the message says (and you can always remove them later from the configuration if you want). The only thing they do is that they disable the automatic check of the SFP and subsequent move of the port into err-disabled state. So if you say that the port does support the speed then it should be no problem. I am just wondering – are you using cisco (certified) SFP or some other vendor’s ? As if you use certified SFP I wouldn’t expect this sort of behavior…

]]> By: hzahiri http://www.kuncar.net/blog/unlocking-cisco-devices-to-work-with-unsupported-sfp/2008/comment-page-1/#comment-693 hzahiri Wed, 08 Jun 2011 17:15:24 +0000 http://www.kuncar.net/blog/?p=24#comment-693 The port support 100 Mbps with the GLC-GE-100FX but I have GLC-FE-100FX that is not supported on C3750. Can you help me with this issue. we tested with two Switches and two SFP modules and we have the same error message: %PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/0/1, putting Gi1/0/1 in err-disable state %LINK-5-CHANGED: Interface Vlan1, changed state to adminis tratively down Thank you in advance BR The port support 100 Mbps with the GLC-GE-100FX but I have GLC-FE-100FX that is not supported on C3750.
Can you help me with this issue. we tested with two Switches and two SFP modules and we have the same error message:
%PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/0/1, putting Gi1/0/1 in err-disable state
%LINK-5-CHANGED: Interface Vlan1, changed state to adminis tratively down
Thank you in advance
BR

]]> By: tnk http://www.kuncar.net/blog/unlocking-cisco-devices-to-work-with-unsupported-sfp/2008/comment-page-1/#comment-692 tnk Wed, 08 Jun 2011 10:22:02 +0000 http://www.kuncar.net/blog/?p=24#comment-692 In short these commands will make no difference to your current state. In long - the port seems to be 1Gbps only (according to the manual on cisco web) so 100mbps SFP will not work as it is physically different on L1. These commands are just for disabling a CRC check of the SFP so it allows SFPs of vendors that are not certified by cisco (i.e. coretek/finisar) but the SFP you are mentioning is either cisco or prolabs who both have the crc in place so it should work straight away. So check if the port is capable of 100mbps first and if it is (which I doubt) you have a faulty sfp. In short these commands will make no difference to your current state.

In long – the port seems to be 1Gbps only (according to the manual on cisco web) so 100mbps SFP will not work as it is physically different on L1. These commands are just for disabling a CRC check of the SFP so it allows SFPs of vendors that are not certified by cisco (i.e. coretek/finisar) but the SFP you are mentioning is either cisco or prolabs who both have the crc in place so it should work straight away.

So check if the port is capable of 100mbps first and if it is (which I doubt) you have a faulty sfp.

]]> By: hzahiri http://www.kuncar.net/blog/unlocking-cisco-devices-to-work-with-unsupported-sfp/2008/comment-page-1/#comment-691 hzahiri Wed, 08 Jun 2011 09:45:18 +0000 http://www.kuncar.net/blog/?p=24#comment-691 Hi, I would like to know if the two commands will unlook the C3750 to support GLC-FE-100FX? can you help on this issue: I have C3750V2-24TS-S and GLC-FE-100FX that in unkown by the Switch. Thank you in advanced BR Hi,
I would like to know if the two commands will unlook the C3750 to support GLC-FE-100FX? can you help on this issue: I have C3750V2-24TS-S and GLC-FE-100FX that in unkown by the Switch.
Thank you in advanced
BR

]]> By: tnk http://www.kuncar.net/blog/unlocking-cisco-devices-to-work-with-unsupported-sfp/2008/comment-page-1/#comment-484 tnk Mon, 05 Apr 2010 17:33:37 +0000 http://www.kuncar.net/blog/?p=24#comment-484 There are three ways: 1) There is a RSS button in the right side of the address bar - just click it or 2) There is RSS button in the right top corner of the page itself and again you can just click it or 3) You can add http://www.kuncar.net/blog/feed address to your feed aggregator. There are three ways:
1) There is a RSS button in the right side of the address bar – just click it
or
2) There is RSS button in the right top corner of the page itself and again you can just click it
or
3) You can add http://www.kuncar.net/blog/feed address to your feed aggregator.

]]> By: Blog comments http://www.kuncar.net/blog/unlocking-cisco-devices-to-work-with-unsupported-sfp/2008/comment-page-1/#comment-483 Blog comments Sun, 04 Apr 2010 19:58:13 +0000 http://www.kuncar.net/blog/?p=24#comment-483 How to add this to my RSS reader? I'm sorry I am a novice :( How to add this to my RSS reader? I’m sorry I am a novice :(

]]> By: tnk http://www.kuncar.net/blog/unlocking-cisco-devices-to-work-with-unsupported-sfp/2008/comment-page-1/#comment-473 tnk Mon, 08 Mar 2010 16:24:03 +0000 http://www.kuncar.net/blog/?p=24#comment-473 Hi the software unlock is done by those two commands mentioned above, the problem though is that the SFP does not have to be compatible i.e.: it will not properly register with the device or it will register but will not work anyway (I saw both variants multiple times with multiple SFPs). Generally Cisco has this software lock for multiple good reasons A) to avoid End users to complain about their no-name SFPs that are not manufactured to the desired standards B) to avoid testing hundreds of SFP vendors and then solving the issues (usually because the vendor is just not able to follow proper specs) C) to earn more money for their overpriced re-branded SFPs So there are only two good options here - either buy Cisco's SFPs that will work always - or try some decent brand which should work as well but is obviously not supported (I know that Agilent and Optech should work just fine). If you decide otherwise and go for some cheap no-name brand you should be expecting some troubles... Hi the software unlock is done by those two commands mentioned above, the problem though is that the SFP does not have to be compatible i.e.: it will not properly register with the device or it will register but will not work anyway (I saw both variants multiple times with multiple SFPs).
Generally Cisco has this software lock for multiple good reasons
A) to avoid End users to complain about their no-name SFPs that are not manufactured to the desired standards
B) to avoid testing hundreds of SFP vendors and then solving the issues (usually because the vendor is just not able to follow proper specs)
C) to earn more money for their overpriced re-branded SFPs
So there are only two good options here
– either buy Cisco’s SFPs that will work always
– or try some decent brand which should work as well but is obviously not supported (I know that Agilent and Optech should work just fine).
If you decide otherwise and go for some cheap no-name brand you should be expecting some troubles…

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