如下是相关的案例：
1、N5K & Cat3750
较新版本的NX-OS在N5K上支持1G或10G，但N5K不支持auto-speed sensing
如下是故障信息的体现：3750和N5K之间安装GLC-SX-MM模块并连接，在3750上看了相关状态，出现了这个错误：
Description: Gi1/1/1: This port has been disabled because Non Compliant Gigabit Interface Converter (GBIC) connector detected.
（此端口已被禁用，因为检测到非兼容千兆位接口转换器（GBIC）连接器。）
Recommendation: Replace connector with cisco compliant Gigabit Interface Converter (GBIC) connector. Refer switch technical documentation to determine cisco compliant connector. Enable the port again.
（使用符合cisco标准的千兆位接口转换器（GBIC）连接器替换连接器。 请参阅交换机技术文档以确定符合cisco的连接器。 再次启用端口。）
操作如下：
①两个设备都支持GLC-SX-MM
②尝试shu/no shu接口
③Cat3750上体现的log：
*Apr 16 01:48:41.190: %PHY-4-SFP_NOT_SUPPORTED: The SFP in Gi1/1/1 is not supported *Apr 16 01:48:41.190: %PM-4-ERR_DISABLE: gbic-invalid error detected on Gi1/1/1, putting Gi1/1/1 in err-disable state
④查看接口（支持GLC-SX-MM，接口下显示信息也OK）
3750_sw1#sh int gig 1/1/1 capa GigabitEthernet1/1/1 Model: WS-C3750X-48P Type: 1000BaseSX SFP Speed: 1000 Duplex: full Trunk encap. type: 802.1Q,ISL Trunk mode: on,off,desirable,nonegotiate Channel: yes Broadcast suppression: percentage(0-100) Flowcontrol: rx-(off,on,desired),tx-(none) Fast Start: yes QoS scheduling: rx-(not configurable on per port basis), tx-(4q3t) (3t: Two configurable values and one fixed.) CoS rewrite: yes ToS rewrite: yes UDLD: yes Inline power: no SPAN: source/destination PortSecure: yes Dot1x: yes 3750_sw1#
⑤但是3750的状态是not connect
3750_sw1#sh int gig 1/1/1 status Port Name Status Vlan Duplex Speed Type Gi1/1/1 notconnect 1 auto auto 1000BaseSX SFP 3750_sw1#
⑥查看N5K上接口状态和信息：
N5K1# sh int e1/5 status -------------------------------------------------------------------------------- Port Name Status Vlan Duplex Speed Type -------------------------------------------------------------------------------- Eth1/5 -- sfpInvali 1 full 10G SFP-1000BAS N5K1# N5K1# sh int e1/5 capa Ethernet1/5 Model: N5K-C5548UP-SUP Type (SFP capable): 10Gbase-(unknown) Speed: 1000,10000 Duplex: full Trunk encap. type: 802.1Q Channel: yes Broadcast suppression: no Flowcontrol: rx-(off/on),tx-(off/on) Rate mode: none QOS scheduling: rx-(6q1t),tx-(1p6q0t) CoS rewrite: no ToS rewrite: no SPAN: yes UDLD: yes Link Debounce: yes Link Debounce Time: yes MDIX: no Pvlan Trunk capable: yes TDR capable: no FabricPath capable: yes Port mode: Switched FEX Fabric: yes N5K1#
其实这里应该看到N5K和Cat3750之间的speed不匹配。
⑦查看N5K的log
N5K1#sh log | inc 1/5
...
2019 Apr 6 18:10:26 N5K1 %ETHPORT-5-IF_DOWN_NONE: Interface Ethernet1/5 is down (None)
...
2019 Apr 6 19:06:10 N5K1 %ETHPORT-5-IF_HARDWARE: Interface Ethernet1/5, hardware type changed to No-Transceiver
⑧在N5K手动设置速度
N5K1# sh int e1/5 stat -------------------------------------------------------------------------------- Port Name Status Vlan Duplex Speed Type -------------------------------------------------------------------------------- Eth1/5 -- connected 1 full 1000 SFP-1000BAS N5K1#
可以看到修改后正常了。
Summary: The newer versions of NX-OS support 1G or 10G on the N5K, but the N5K is not auto-speed sensing. If you run into something similar, even error messages on the remote device, check the port speed on the N5K.
2、N5600 & FEX 2248PQ