zemerdon.com

Posted: **Thu Jan 15, 2026 1:04 pm**

references:
https://www.experts-exchange.com/questi ... rking.html
https://community.cisco.com/t5/switchin ... -p/2557261
https://www.cisco.com/c/en/us/support/d ... le-of.html

error inserting 3rd party transceiver into the 10Gb SFP+ uplink port (Te1/1/3) from 1Gb uplink port (Gi1/1/1):

3650_server#terminal monitor
3650_server#
*Jan 15 02:43:02.593: %LINEPROTO-5-UPDOWN: Line protocol on Interface GigabitEthernet1/1/1, changed state to down
*Jan 15 02:43:03.598: %LINK-3-UPDOWN: Interface GigabitEthernet1/1/1, changed state to down
*Jan 15 02:43:03.833: %PLATFORM_PM-6-MODULE_REMOVED: SFP module with interface name Gi1/1/1 removed
*Jan 15 02:43:08.984: %PLATFORM_PM-6-MODULE_INSERTED: SFP module inserted with interface name Te1/1/3
*Jan 15 02:43:08.984: %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR: GBIC in port 51 has bad crc

Let's enable the use of third-party transceivers in our uplink SFP port(s)!

SSH/SERIAL into switch

Code: Select all

enable
conf t
int gigabitEthernet 1/1/1
service unsupported-transceiver
no errdisable detect cause gbic-invalid
int gigabitEthernet 1/1/1
shutdown
no shutdown

3650_server>enable
Password:
3650_server#terminal monitor
3650_server#conf t
Enter configuration commands, one per line. End with CNTL/Z.
3650_server(config)#int ten
3650_server(config)#int tenGigabitEthernet 1/1/3
3650_server(config-if)#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.

3650_server(config)#no errdisable detect cause gbic-invalid
3650_server(config)#int ten
3650_server(config)#int tenGigabitEthernet 1/1/3
3650_server(config-if)#shutdown
3650_server(config-if)#
*Jan 15 02:53:15.621: %LINK-5-CHANGED: Interface TenGigabitEthernet1/1/3, changed state to administratively down
*Jan 15 02:53:16.622: %LINEPROTO-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/1/3, changed state to down
3650_server(config-if)#no shutdown
3650_server(config-if)#
*Jan 15 02:53:34.372: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/1/3, changed state to down
*Jan 15 02:53:36.947: %LINK-3-UPDOWN: Interface TenGigabitEthernet1/1/3, changed state to up
*Jan 15 02:53:37.948: %LINEPROTO-5-UPDOWN: Line protocol on Interface TenGigabitEthernet1/1/3, changed state to up

zemerdon.com

Cisco 3650 third party tranceiver WORKING

Cisco 3650 third party tranceiver WORKING