Introduction
Saravanan Lakshmanan is a customer support engineer at the Cisco Technical Assistance Center, specialising in wireless technologies and solving high-severity and critical wireless issues for Cisco customers and partners. In this document, Saravanan explained about Understanding 3850 uplink ports/NM Module.
3850 - 48 switch Ports
show interface status, status, capabilities, spanning-tree, mtu might not show all available Gig/Ten-Gig uplink physical interfaces because it is based on the uplink NM type installed on 3850.
How to find what type of NM module is installed/available on the 3850 switch
----------------- show inventory ------------------
NAME: "c3xxx Stack", DESCR: "c3xxx Stack"
PID: WS-C3850-48T , VID: L0 , SN: FOC1747Y5UD
NAME: "Switch 1", DESCR: "WS-C3850-48T"
PID: WS-C3850-48T , VID: L0 , SN: FOC1747Y5UD
NAME: "Switch 1 - Power Supply A", DESCR: "Switch 1 - Power Supply A"
PID: PWR-C1-350WAC , VID: V01 , SN: AZS1726015W
NAME: "Switch 1 - Power Supply B", DESCR: "Switch 1 - Power Supply B"
PID: PWR-C1-350WAC , VID: V01 , SN: AZS17260160
NAME: "Switch 1 FRU Uplink Module 0", DESCR: "2x1G 2x10G Uplink Module" =========> uplink modules. Below are the available uplink ports.
PID: C3850-NM-2-10G , VID: V01 , SN: FOC17448T4Y
NAME: "GigabitEthernet1/1/1", DESCR: "1000BaseSX SFP"
PID: GLC-SX-MMD , VID: V01 , SN: AGA1743RP4A
NAME: "GigabitEthernet1/1/2", DESCR: "1000BaseSX SFP"
PID: GLC-SX-MMD , VID: V01 , SN: AGA1743RS1C
NAME: "TenGigabitEthernet1/1/3", DESCR: "1000BaseSX SFP"
PID: GLC-SX-MMD , VID: V01 , SN: AGA1743RPA5
NAME: "TenGigabitEthernet1/1/4", DESCR: "1000BaseSX SFP"
PID: GLC-SX-MMD , VID: V01 , SN: AGA1743RPAN
Not showing interfaces Gi1/1/3, Gi1/1/4, Te1/1/1 and Te1/1/2, which is expected.
Show interface status
------------------ show interfaces status ------------------
Port Name Status Vlan Duplex Speed Type
Gi1/0/1 connected 352 a-full a-1000 10/100/1000BaseTX
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Gi1/0/47 notconnect 1 auto auto 10/100/1000BaseTX
Gi1/0/48 notconnect 1 auto auto 10/100/1000BaseTX
Gi1/1/1 connected 1 full 1000 1000BaseSX SFP
Gi1/1/2 connected 1 full 1000 1000BaseSX SFP
Te1/1/3 connected 1 full 1000 1000BaseSX SFP
Te1/1/4 connected 1 full 1000 1000BaseSX SFP
------------------ show spanning-tree ------------------
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Interface Role Sts Cost Prio.Nbr Type
------------------- ---- --- --------- -------- --------------------------------
Gi1/1/1 Desg FWD 4 128.49 P2p
Gi1/1/2 Desg FWD 4 128.50 P2p
Te1/1/3 Back BLK 4 128.55 P2p
Te1/1/4 Back BLK 4 128.56 P2p
It is an expected behaviour based on the available Uplink module on the 3850 switch.
More Information
Configuring a Network Module
3850: Understanding interface configuration on NM modules
