Cisco设备只能用Cisco品牌的光模块，其他品牌或杂牌的光模块思科设备是绝对不支持的。如果你硬是插上别的光模块，Cisco端口信息上就会显示Unsupport或Unknown。日志显示以下情况中一种或几种： %PM_SCP-SP-3-TRANSCEIVER_UNSUPPORTED：Unsupported transceiver in LAN port */* %PHY-4-CHECK_SUM_FAILED：SFP EEPROM data check sum failed for SFP interface Gi1/0/25 %GBIC_SECURITY_CRYPT-4-VN_DATA_CRC_ERROR：GBIC in port Gi1/0/25 has bad crc %PM-4-ERR_DISABLE：gbic-invalid error detected on Gi1/0/25，putting Gi1/0/25 in err-disable state
保存配置。然后插上光模块，完成。现在Switch就不会去检查GBIC的序号，而让使用者可以先把第三方的GBIC或SFP插在机器上，让网路先恢复运作。当然。并不鼓励这样做。如果非要如此，建议要熟记命令，否则用“？”但是无论如何也看见不到unsupported-transceiver出现在Command list里面，Cisco公司特别说明：用（config）#service unsupported-transceiver指令之后，设备会跳出以下的警告讯息。 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 Ciscos 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.