linking 3650's via fiber

[simon.howard]

Hi, hoping someone can help with this irritating problem I've got!

My current office has 5 x Cisco 3650 switches stacked together (via stacking module) that services what I will call Office-A. I need to connect these via OM4 MM fiber cable to a new floor space 150 feet away which I will call Office-B. This office has 2 x 3650's stacked via stacking module again. Checking the interfaces Office-B's switches they can see each other ok, so I'm using Cisco branded SFP's to connect the fiber back to Office-A with the below configuration from Office-B's switch-1 to Office-A's Server switch:

#vtp mode client

#interface t1/1/1

#switchport mode trunk

#switchport trunk allowed vlan all

#switchport trunk native vlan 1

#no shutdown

However I cant get a connection to form between the stacks. I know the fiber is working ok (a Netgear switch is able to connect instantly to its neighbour without any problems) so what am I missing? I've attached a crude Visio of what I'm attempting.

Many thanks

[Mark Malone]

Hi

Are the interfaces up/up on both sides yes ? can you post them 

if there up do you see cdp between them ? and if up what does show int trunk provide each side

[simon.howard]

Hi Mark, no the interfaces arent up at all. The status lights are dead and dont respind when I plug the SFO's in. I know the fiber works as a netgear switch used for lining the voip networks between office (on fiber patch port 3) works ok. When I plug the Cisoc switches into that port on either end they stay dead.

[Mark Malone]

Hi

whats the sfps that you are using and what ports exactly on the module are you connecting them to

can you post the show inventory

[simon.howard]

Hi, I've been supplied with 4 x spf-10g-sr-s and 2 x mgbsx1

should also mention I'll be connecting 2 x 10 port cisco switches to connect Meraki Wifi AP's to our firewalls but that's separate, hence the extra sfp's.

[Mark Malone · Accepted solution]

the 10gbs should work 3650s don't support the other type

I believe these mods are the same as 3850 and theres specific pisrt for 10gb have you tried the below if your 10gb ?

C3850-NM-2-10G

This module has four slots that support the following combinations:

•Two slots (left side) support only 1-Gigabit SFP modules and two slots (right side) support either 1-Gigabit SFP or 10-Gigabit SFP modules.

•Three slots (left side) support 1-Gigabit SFP modules and one slot (right side) supports 10-Gigabit Ethernet SFP+.

Supported combinations of SFP and SFP+ modules:

•Slots 1, 2, 3, and 4 populated with 1-Gigabit SFP modules.

•Slots 1 and 2 populated with 1-Gigabit SFP modules, and Slot 4 populated with one 10-Gigabit SFP+ module.

•Slot 3 and Slot 4 each populated with 10-Gigabit SFP+ modules.

Catalyst 3650 Series
Network Device	Transceiver Model	Minimum Software Release Required
		DOM Support	Software Release
WS-C3650-24TD WS-C3650-48TD WS-C3650-24PD WS-C3650-48PD WS-C3650-48FD WS-C3650-48FQ WS-C3650-48PQ WS-C3650-48TQ WS-C3650-24PDM3 WS-C3650-48FQM3 WS-C3650-8X24UQ3 WS-C3650-12X48UQ3 WS-C3650-12X48UR3 WS-C3650-12X48UZ3	SFP-H10GB-CU1M SFP-H10GB-CU3M SFP-H10GB-CU5M	—	XE 3.3.0SE
	SFP-10G-SR SFP-10G-LRM SFP-10G-LR SFP-10G-ER SFP-10G-SR-S SFP-10G-LR-S SFP-10G-ER-S	XE 3.3.0SE	XE 3.3.0SE
	SFP-10G-ZR SFP-10G-ZR-S DWDM SFP+	XE 3.3.3SE	XE 3.3.3SE
	CWDM SFP+	XE 3.7.0E	XE 3.7.0E
	SFP-H10GB-CU1-5M SFP-H10GB-CU2M SFP-H10GB-CU2-5M SFP-H10GB-ACU7M SFP-H10GB-ACU10M SFP-10G-AOC1M SFP-10G-AOC2M SFP-10G-AOC3M SFP-10G-AOC5M SFP-10G-AOC7M SFP-10G-AOC10M	—	XE 3.6.0E
	SFP-10G-BXD-I SFP-10G-BXU-I SFP-10G-BX40D-I SFP-10G-BX40U-I	XE 3.7.1E	XE 3.7.1E

[Mark Malone]

great good stuff :)

[simon.howard]

HI, fixed it! I had the sfp in port 1 instead of port 3 or 4 which is for 10gb modules. As soon as I plugged it in there it came up!

[paul driver]

Hello

If your configuration is correct and you still have no physical connection - Try swapping the fibre strands of the fibre cable around at one end of the connection

res
Paul