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Setting Up Cisco C3660V2 FIBER UP LINK

Dear All ,

i would like to know the config. steps required for setting up fiber link between two cisco c3650v2

If i do : sh run , i hadly see the fiber ports on the switch.


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New Member

Re: Setting Up Cisco C3660V2 FIBER UP LINK

Please elaborate on what you mean by "i hadly see the fiber ports."

If what you are asking is a matter of trunking (802.1q) the two switches together, you merely need to configure the interfaces as trunks on both switches with the appropriate VLAN's. You will also need the SFP's for each switch and an LC-LC, duplex fiber. The mode of the fiber must match the SPF i.e. GLC-SX-MM is for multi-mode fiber.

Example config:

Switch-A# config t

Enter configuration commands, one per line.  End with CNTL/Z.

Switch-A(config)# int g0/1

Switch-A(config-if)# switchport trunk encapsulation dot1q

Switch-A(config-if)# switchport trunk allowed vlan 10

Switch-A(config-if)# switchport mode trunk

Switch-A(config-if)# no shut

Switch-A(config-if)# ^z

Switch-A# wr me

Switch-A# exit

Switch-B# config t

Enter configuration commands, one per line.  End with CNTL/Z.

Switch-B(config)# int g0/1

Switch-B(config-if)# switchport trunk encapsulation dot1q

Switch-B(config-if)# switchport trunk allowed vlan 10

Switch-B(config-if)# switchport mode trunk

Switch-B(config-if)# no shut

Switch-B(config-if)# ^z

Switch-B# wr me

Switch-B# exit

Provided that the hardware is in place (SFP's on both switches) and cabling, the above configuration should provide what you are looking for.


New Member

Setting Up Cisco C3660V2 FIBER UP LINK

Thanks Micah , thanks for the clarification.

what i mean by ' i hardly see the fiber port '' is this : on typing show run  i do not the fiber ports displying .

the hardwares are all in place am suspecting the fiber cabling from the fiber patch panel.


Hall of Fame Super Gold

Setting Up Cisco C3660V2 FIBER UP LINK

Can you post the output to the following commands:

1.  sh interface status

2.  sh idprom interface

New Member

Setting Up Cisco C3660V2 FIBER UP LINK


The commands posted by leolaohoo are good places to look. An example of the sh interface status output is as follows:

3560G-01#show interfaces gigabitEthernet 0/28 status

Port      Name               Status        Vlan       Duplex  Speed Type

Gi0/28                          connected  trunk       a-full     a-1000 10/100/1000BaseTX SFP

An example of the sh idprom interface output is as follows:

cvc-3560g-ott1#sh idprom interface gigabitEthernet 0/28

General SFP Information


Identifier            :   0x03

Connector             :   0x00

Transceiver           :   0x00 0x00 0x00 0x08 0x00 0x00 0x00 0x00

Encoding              :   0x01

BR_Nominal            :   0x0D

Vendor Name           :   CISCO-AVAGO

Vendor Part Number    :   ABCU-5710RZ-CS2

Vendor Revision       :   0x20 0x20 0x20 0x20

Vendor Serial Number  :   AGM120825NE


Other Information

And so on...

If your SFP is bad you will see the following output:

3560g-01#sh idprom interface gigabitEthernet 0/26

%No module is present

If you see nothing at all when you run any of those commands either the interface does not exist or the software might have a bug in my opinion.

Hope this helps.


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