C9300-24S (24 Uplinks port with 8x10G Uplink Module)

[jasonnkh@live.com]

Hi All.

Just wanna if this switch is able to perform Rj45 to fibre conversion? recently i plugged Rj45 cable(From internal Firewall) --> switchport gi1/0/24 via Cisco GLC-TE 10/100/1000BaseTX SFP, however it only show the port is up and running, anyway to check if the conversion to fibre is complete? 

Many Thanks

Jason N

[Kasun Bandara]

Hi,

as per your explanation, you connected GLC-TE transceiver to connect Copper cable from firewall. so there is no any fiber conversion required. SFP ports are not fiber or copper. port functionality is depends on the transceiver you are connecting.

GLC-TE for copper termination

GLC-SX-MMD or other for fiber termination

check below link if you need to troubleshoot exact fiber connectivity.

https://www.cisco.com/c/en/us/support/docs/smb/switches/cisco-350x-series-stackable-managed-switches/smb5568-view-the-optical-module-status-on-a-switch-through-the-comma.html

https://community.fs.com/blog/check-sfp-module-optical-signal-strength.html

Mark this as answer or upvote if this solved your concern

KB

[jasonnkh@live.com]

Hi @Kasun Bandara ,

Thank you for the detailed information, cos one of the colleague mentioned that the switch have the function and ability to auto-convert itself from Rj45 to Fibre once it connected, just to clarify is it true base on your experience?

Thank you

Jason N

[Kasun Bandara]

Hi Jason,

yes. conversion its a task of transceiver. switch SFP port will use ingress electronic signals coming form the transceiver. egress traffic will pass to transceiver as a electric signals and transceiver will send signal to relevant media depending on the connection type.

Mark this as answer or upvote if this solved your concern

KB

[jasonnkh@live.com]

Hi @Kasun Bandara ,

Thank you so much for all the wonderful information and guide, however I do configured on the switch command below in order to make the conversion work.

int gi1/0/24
mdix auto

Thanks and Regards

Jason N

[Kasun Bandara]

Hi jasonnkh@live.com ,

thanks for sharing the actions you took related to connectivity. MDIX is allows switch to identify the copper cable type (straight or crossover) and convert electric signals matching to required cable type. this gives user ability to use any kind of copper cable (straight or crossover) without worrying about that.

this will help you to identify this command.

https://community.fs.com/blog/mdi-vs-mdix-and-auto-mdimdix-basis.html

note: that is not related to fiber conversion or fiber related connectivity.

rate this and mark as solved if this solved your concern

Good luck

KB

[Seb Rupik]

Hi there,

How is the RJ45 cable from the firewall configured, mode trunk or access?

Configure the port on the c9300 to correctly receive it:

!
vlan 10, 20, 30
!
int gi1/0/24
  switchport access vlan 10
  switchport mode access
  no shut
!
!! --------- or -----
!
int gi1/0/24
  switchport trunk allowed vlan add 10,20,30
  switchport mode trunk
  no shut
!

You could then issue the sh mac address vlan xx for the VLANs you have configured, you should see the MAC address of the firewall interface you are connected to.

You could go a step further an configure SVIs for those VLANs (in the correct subnets) and if the firewall permitted the traffic you would be able to ping the firewall interface from the switch.

cheers,

Seb.

[jasonnkh@live.com]

Hi @Seb Rupik ,

Thanks for your detailed information, it is connected in trunk mode and the switch is already configured below;

int gi1/0/24
  switchport trunk allowed vlan add 10,20,30
  switchport mode trunk
  no shut

is able to ping to the firewall, just curious how the switch perform auto conversion from RJ45 to Fiber 

Thank you

Jason N

[Seb Rupik]

Hi there,

It is the physical switchport or SFP which determines what sort of electrical signaling it can send and receive on the connected media. The GLC-TE is 802.3ab standard compliant so can send and receive Ethernet frames on a Cat5,5e,6 UTP cable.

The optical SFP you use will be compliant with the 1000BASE-xx standard (also part of IEEE 802.3).

Once a switch has successfully received an electrical or optical signal via a switchport it can then be reassembled into an Ethernet frame and ingested by the device itself or switched/ routed out via another interface as which point it will then be transmitted on the connected media determined by the interface type.

cheers,

Seb.

[jasonnkh@live.com]

Hi @Seb Rupik ,

Thank you so much for the great explanation and guide of how things work.

Thanks and Regards,

Jason N