Cisco 2960 SFP <—> FMC setup

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You can always try issuing the command:  service unsupported-transceiver. Not guaranteed to work however.

 

Also issue 'no errdisable detect cause gbic-invalid'.

 

Vendors like Ubiquity and Netgear are a bit more forgiving with 3rd party SFP/SFP+ modules.

 

 

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1 hour ago, kerisabe said:

to answer your question no, the switch hasnt been reset to factory default. Is there a manual way of doin it? And yes it is located after the airport express, tplink mc220L then the switch via fiber optic. 

 

On Cisco go to console mode (enable then  conf t) and issue 'erase start' and confirm.

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13 minutes ago, kerisabe said:

is it possible to go to console mode without havin the console cable? Just by directly connecting an ethernet cable to it and my mac? 

The only way to do that is if you have either a loopback interface or you have a VLAN setup and SVI (Switched Virtual Interface) with IP on it.  THEN you have to have a port on the switch placed into that vlan:

 

SW(Config)# Vlan 10 *creates a vlan*

SW(Config)# int vlan 10 *creates a virtual host on that vlan*

SW(INT-Vlan)# Ip add 192.168.0.254 255.255.255.0 *assigns the virtual host an IP*

SW(INT-Vlan)#exit

SW(Config) int g0/1 

SW(Int)# switchport mode access *makes sure the port is in access or Layer 2 mode*

SW(Int)# Switchport access vlan 10 *places the port into Vlan 10*

SW(Int)# exit

Sw(config)# copy ru st *saves the config to flash memory on the switch*

 

You have to have a console cable. They are $12.

 

Plug in your computer to the specified port, assign it an ip address of 192.168.0.1 255.255.255.0 and you should be able to ping 192.168.0.254.  You will be able to manage via telnet at this point. 

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9 minutes ago, kerisabe said:

Thank you @plissken for the detailed info but this is a bit overwhelming since this is my first time touching these things. And is it possible to do a hard reset physically by just the unit itself? 

 

You can hard reset, but you CAN NOT manage a Cisco switch with factory defaults W/O a console cable. It won't have an IP address. 

 

That's why they put a console port on it.

 

Look on the sticker and post the exact model #. 

 

I can even build a config for you based on what you want to accomplish, PM it to you and you can copy/paste. Or I can email you the startup config file and you can copy it to flash. But you are going to need a console cable. 

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30 minutes ago, kerisabe said:

Thank you so much @plissken so the model no is WS-C2960-48TC-L . Does the console cable connects w a mac? It looks like it needs a serial plug? So i guess i need to find a thunderbolt-serial adaptor? 
 

so today i went out to purchase a WS-C2960-8TC-S. I wanted to try it since it has no fan. Managed to hold the mode button for 10s to reset it. Connected the fiber optic to the sfp port and my ethernet to my mac and it worked.

 

Sounds like the new switch had everything to defaults including only the default vlan 1 🙂

 

What Mac do you have? The link I provided was for a USB to Serial Adapter.

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13 minutes ago, TubeMan said:

" Managing the Switch

After completing Express Setup and installing the switch in your network, use the device manager, Cisco Network Assistant, or another of the management options described in this section for further configuration "

 

 

https://www.cisco.com/c/en/us/support/cloud-systems-management/network-assistant-version-6-0/model.html#~tab-downloads

 

 

 

That's after you have the initial setup done. Still need an IP Address.

 

Not sure if all 2960's (Cisco has many builds of these) follow this guide.

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10 minutes ago, TubeMan said:

NO

Express set is always available on 2960 series,

with ip 10.0.0.1 on port 1

 

Cool beans.

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4 minutes ago, kerisabe said:

Btw has anyone here tried changing the smps internal psu into a linear psu or battery psu? And how significant is the change? 

 

That would be quite the hack to get done. I wouldn't mess with that. I would simply use the SFP and go fiber and break any electrical connection.

 

People are chasing gremlins that don't exist.

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2 minutes ago, Jud said:

Actually the fellow who did the linear PSU called it “trivial” - for him.

 

That's a matter of perspective. If you vlan setup is a challenge....

 

Why would anyone bother with that when you can go wifi or optical dirt cheap. Oh wait...

 

On a side note how does a power supply modded switch improve the 10Km run of single mode fiber?

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For people picking up 2960's:

 

Make sure you get the units with the LAN Base and NOT LAN Lite IOS.

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Just now, TubeMan said:

 

Lite IOS is not for the old 2960/2960G series

 

Ok, then if you are getting a newer 2960 make sure it has the LAN Base release.

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1 minute ago, Jud said:

As noted by many electrical references, it’s inside the home that noise on power lines is really a problem. So the 10k run to my mind is really irrelevant.

 

 I don’t know how much noise might make it through the switch (only whatever’s involved in the opto-electronic conversion if you do optical), but it’s what the power supply puts back into the wall and system that I would be concerned about, if anything. (And by that I mean that I don’t know if there’s necessarily anything to be concerned about, but if folks want to take an interest and play around a bit, why not?)

 

No, it's not irrelevant. How long of a run of optical do you need to your endpoint to take care of the EMI/RFI issue. I hope you are seeing the point. 

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3 minutes ago, Jud said:

Because...?

 

If you only get LAN Lite you can't do any layer 3 (ip routing) natively on the switch. So no intervlan routing.

 

If you get the LAN base you can simply:

 

sw(console)# ip routing

sw(console)# ip default-gateway ipofyourrouterhere

sw(console# vlan 10, 20, 30, etc

sw(console)#int vlan 10,20,30 etc

sw(int vlan)# ip add x.x.x.x #.#.#.# (address and subnet)

 

and plug into your router and be good to go.

 

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1 minute ago, TubeMan said:

but those doesn't sound that good as the older 2960 series

 

Lol.

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31 minutes ago, Jud said:

I just did the last step (plug it in) with my two and everything works great. 😀

And that will work as everything is in the default Vlan 1.

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30 minutes ago, TubeMan said:

why would you use VLAN if you don't separate them in different subnets,,,,

Because you would put them in different subnets:

 

192.168.0.0-31

192.168.0.32-63

192.168.0.64-95

192.168.0.96-127 etc

 

That could be 0 for audio wifi and audio wired

32 could be guest wifi and wired

64 could be server/service (file server,nas, roku, fire stick etc)

96 could be household iot, thermostat, security camera's etc.

 

Then you could ACL so you would prevent, say 96 from getting anywhere other than vlan 1 and out to the internet.

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3 hours ago, TubeMan said:

overkill for home network

 

same subnet for all ip in that example by the way

How would you know, I didn't list the subnet mask. But you should be able to figure it out from the ranges I gave out. That would be /27's. 

 

We are also talking to people who will put in linear PS, $700 'audiophile' switches, $400 network cables. And simply vlaning off crap like IoT and cheap Chinese DVR systems that a lot of households will use is overkill?

 

All the IGMP from those other devices can cause audible noise, right?

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3 hours ago, Jud said:

Not that anyone should be discouraged from using different subnets if they’d like, but it’s correct that the example shows everything on the same subnet.

 

No it's not on the same subnet. Any network guy would have figured out that 

 

192.168.0.0 /27 is 0 is network 31 is broadcast with 1-30 usable

192.168.0.32/27 is 32 network with 63 as broadcast and 33-62 usable

192.168.0.64/27 is 64 network with 95 as broadcast and 65-94 usable

192.168.0.96/27 is 96 network with 127 as broadcast and 97-126 usable

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59 minutes ago, TubeMan said:

and default route will be

ip default-gateway and whatever the ip address of your router is.

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If people are interested I can make a video tutorial on what we've been talking about.

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Give me a day or so. I did a dry run and it turned came out at 21 minutes and want to get it a bit shorter than that if I can. 

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I think it will be a 3 parter:

 

VLAN's and Inter-Vlan Routing

 

Trunking

 

Routing

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Part 1 VLAN's / SVI / IVR (Switched Virtual Interface) (Inter-Vlan Routing)

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Here is part 2: Put Junk on your Trunk

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Here is the promised part 3. Warts and all. You'll see me do some minor t-shooting as I decided not to edit it out. The third part isn't as important to what we were discussing in this thread but it does round it out a bit.