WS-C3750G-12S using known-good non Cisco SFP and getting bad CRC errors

[addylamlappun]

Please advise, and thanks in advance.

I have a new WS-C3750G-12S running 12.2(25)SEB2 and since I have working SFPs around so I thought I could just order this switch without any SFPs. I installed my good SFPs and when the 3750 boots up, I get the following messages:

00:40:50: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port 65537 has bad crc

00:40:50: %PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/0/1, putting Gi1/0/1 in err-disable state

00:41:00: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port 65538 has bad crc

00:41:00: %PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/0/2, putting Gi1/0/2 in err-disable state

00:41:13: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port 65539 has bad crc

00:41:13: %PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/0/3, putting Gi1/0/3 in err-disable state

00:41:27: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port 65540 has bad crc

00:41:27: %PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/0/4, putting Gi1/0/4 in err-disable state

00:41:37: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port 65541 has bad crc

00:41:37: %PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/0/5, putting Gi1/0/5 in err-disable state

00:41:49: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port 65542 has bad crc

00:41:49: %PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/0/6, putting Gi1/0/6 in err-disable state

00:42:08: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port 65543 has bad crc

00:42:08: %PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/0/7, putting Gi1/0/7 in err-disable state

00:42:13: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port 65544 has bad crc

00:42:13: %PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/0/8, putting Gi1/0/8 in err-disable state

00:42:21: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port 65545 has bad crc

00:42:21: %PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/0/9, putting Gi1/0/9 in err-disable state

00:42:26: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port 65546 has bad crc

00:42:26: %PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/0/10, putting Gi1/0/10 in err-disable state

00:42:33: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port 65547 has bad crc

00:42:33: %PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/0/11, putting Gi1/0/11 in err-disable state

00:42:38: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port 65548 has bad crc

00:42:38: %PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/0/12, putting Gi1/0/12 in err-disable state

Switch>

I then unplugged all the SFPs except for two, and put in the following command which got rid of err-disable state message, but still got the bad CRC messages.

Betelgeuse(config)#no errdisable detect cause gbic-invalid

00:01:02: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port 65537 has bad crc

00:01:02: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port 65540 has bad crc

I also have a Catalyst 3750G-24TS-1U which also shows the same messages. My question is if there is a chance that I can use industry-standard SFPs for the 3750 and what are the commands to enable this. Thanks.

[Prashanth Krishnappa]

Only Cisco GBICs will work with Catalyst3750. The IOS will check for the EEPROM on the GBIC to verify if it is a Cisco GBIC and this check cannot be disabled.

[addylamlappun]

Hi prkrishn,

Thanks for your update. I have a couple of follow-up questions now that I have acquired some Cisco approved 3rd party SFP and I am not see these errors upon SFP insertion. I took 1 SFP from the lot and verified that it works on someone else's 3750 (link up), but when I inserted that SFP into my 3750, my connection does not come up. This is a 3750-12S in a stack with a 3750-24TS-1U running a different code.

- How do I know if the 3750 recognizes the SFP and tells if it is compatible?

- Do I need to do any special setup to get the port to come up as port is set. Ports are set to access mode.

Thanks for your help.

[andrew.butterworth]

Is there a difference in IOS versions on these 2 3750's? I seem to remember reading in some release notes that Cisco have removed this restriction with non-cisco SFP's. (It was either release notes or a partner update email but I can't seem to find it).

It may be worth just updating your 3750 to the latest IOS (12.2(25)SEC) and see if the SFP is recognised.

HTH

Andy

[Prashanth Krishnappa]

Actually 12.2(25)SE and has this capability but needs to be turned on using the command "service unsupported-transceiver"

3750#conf t

Enter configuration commands, one per line. End with CNTL/Z.

3750(config)#service unsupported-transceiver

Warning: When Cisco determines that a fault or defect can be traced to

the use of third-party transceivers installed by a customer or reseller,

then, at Cisco's discretion, Cisco may withhold support under warranty or

a Cisco support program. In the course of providing support for a Cisco

networking product Cisco may require that the end user install Cisco

transceivers if Cisco determines that removing third-party parts will

assist Cisco in diagnosing the cause of a support issue.

3750(config)#

[Prashanth Krishnappa]

You can use "sh idprom interface gigabitEthernet" command.

Switch#sh idprom interface gigabitEthernet 2/0/1

General SFP Information

-----------------------------------------------

Identifier : 0x03

Connector : 0x07

Transceiver : 0x00 0x00 0x00 0x01 0x20 0x40 0x0C 0x00

Encoding : 0x01

BR_Nominal : 0x0C

Vendor Name : CISCO-AGILENT

Vendor Part Number : QFBR-5798L

Vendor Revision : 0x20 0x20 0x20 0x20

Vendor Serial Number : Axxxxxxxx

-----------------------------------------------

[aabuzahr]

you can refer to the document below

https://www.cisco.com/c/en/us/support/docs/interfaces-modules/gbics/200296-Unsupported-GBIC-SFP-in-sub-module-of.html

However, it's not recommended to use a third party part - only Cisco manufactured

and there's a related bug:

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvg95411/?rfs=iqvred