3750G configuration

[D3savage]

Hi I am a bit of a super noob ...... the long and short is I purchased a second hand pre loved 3750G 24 switch for home use. In all honesty I don't really want to dig deep into cisco programming...although I can see lots of good things are available. To give you some background......... I want to use the switch for connecting 7 ethernet cat 6 points situated across my house - these are used for:- general computing, smart TV's, DVR's,streamers etc. So I have seven cables coming into the switch, 3 more from a unifi wireless system - (2 ap's and one cloud key) I also intend in the near future to install a digital security system - using poe cameras from ubiquiti G3's  AF models.

So my thoughts were - I would need more ports - poe - and the possibility of maybe creating a vlan for 4 security cameras so that the traffic generated by constant streams - did not effect my general network traffic.

I am hoping somebody here could hold my hand advise me - and help me set up the switch. 

I have been told my switch has been set to its base factory config - and I have tried it with my laptop it found the laptop and connected to the internet just fine. Currently my cisco switch is connected via one of the lan ports to my Asus router DSL AC68U ........ 

It would be very much appreciated if somebody - could advise me and help me through this step by step - kind regards

[Dennis Mink]

to what are you recording?  does that box have PoE ports?

other than that, keep all in one vlan, most of your clients will be on wireless right?

[Georg Pauwen]

Hello,

basically, when you leave everthing at the default settings, anything you plug into one of the 24 ports will get an IP address from the ASUS (in the 192.168.1.0/24 or 192.168.0.0/24 range), which subsequently will enable the device(s) to access the Internet.

Now when you need another VLAN, you can simply configure the ports as below:

interface GigabitEthernet1/0/2

switchport mode access

switchport access vlan 4

spanning-tree portfast

This will create a new Vlan (4) and all devices connected to ports configured this way will belong to this Vlan. Now, if you want the new Vlan to be able to talk to the other Vlans, you need to enable 'ip routing' on the 3750 and create an SVI:

interface Vlan 4

ip address 192.168.4.1 255.255.255.0

You can either manually assign IP addresses from that range to your Vlan 4 devices, or use the 3750 as a DHCP server:

ip dhcp excluded-address 192.168.4.1

!

ip dhcp pool VLAN4

network 192.168.4.0 255.255.255.0

default-router 192.168.4.1

dns-server 8.8.8.8 8.8.4.4

Now, when you want Vlan 4 devices to be able to connect to the Internet as well it gets a bit more complicated, as the 3750 does not do network address translation. In that case, you can create the Vlan 4 and address range on the ASUS...

[D3savage]

Hi thank you so much for the reply! that is really very helpful and a very good starting point for me.........I will proceed one step at a time. One of the final things I will be setting up is poe for the ubiquiti Ap's, Cloud Key and the G3 cameras.

[D3savage]

Currently ... no internet connection on my main pc (have established it is not the pc!) - no packets are being received.

I have had a further look into my issues.........it looks like my cisco even through it is giving green connection lights is not giving out ip's ........ Looking at my current connection setup ....... I have an Asus modem router (DSL AC68U) connected via ethernet to one of the ports on the cisco and netgear switches - I then am trying to distribute through the house. (I did not want to disconnect old netgear hub until the cisco was proven)

My thoughts are maybe the netgear and cisco switch on - asus router is too much - and there is a bun fight going on over ip allocation creating issues.

So I thought I might - try disconnecting the netgear switch - and see what happens and test.

If that fails I could disable the Asus router dchp and allocate a static ip - then let the cisco do its own thing - hopefully in a happy way ;-)

Do you think I am looking at this the right way????

[Georg Pauwen]

Hello,

can you post the running configuration of your switch (show run) and indicate which port connects to the ASUS ?

[D3savage]

OK....I will give it a go tonight....(gmt)

[D3savage]

Hi I am so sorry for going very quiet ..... I have had some big issues going on at home.....I have now got into a position to start looking at my config ....... I have a couple of issues ........... on my 24 port switch I need to 

1  Enable 5 ports for POE 

2  Enable ports so that they can work with auto dchp switches

I was hoping ........ perhaps I could send you my config as a text file and you could maybe tweak it for me .... so i could upload it back in.....

Currently the switch works fine but only for a single device on each port....if you connect a little dchp witch .......... the ip no longer gets through.........

Kind regards

   Richard

[Mark Malone]

Yes send on the file we can make the changes

POE is on by default no config required

[D3savage]

Hi thank you so much .... cheers!!

I am using Ubiquiti cameras - and I think I read somewhere the auto sensing will not work - and poe needed to be enabled and not left to auto....hope thqt makes sense.

Regards

   Richard Manchester UK

[D3savage]

I am aware Ubiquiti generally use 24v poe .... I will use one of their converters to take me from 48v to 24v..........

[Mark Malone]

Hi
well youve only got these options under the interface and maybe less on a 2960 , thats how you alter the POE below though , there is no on as its on by default but you have other variants , its also about the POE type make sure the 2960 supports same POE type as Ubiquiti , there are several formats but most support teh standard 802.3af i think

(config-if)#power inline ?
auto Automatically detect and power inline devices
consumption Configure the inline device consumption
four-pair Four-pair PoE power
never Never apply inline power
police Police the power drawn on the port
static High priority inline power interface

[D3savage]

Hi fun and games last night ... eventually got my switch config... enclosed. It appears there is no password ..........main issues are I cannot use small 5 port hubs - when connected to this - it seems to block the ip. If it is possible to enable poe that would be great on say ports 19,20,21,22,23,24........... Can you advise me how to set up a general password......... Cheers thanks for your very kind offer of help...

[Mark Malone]

Hi
Its completely blank it couldn't block the IPs as theres no onfiguration acls anything on it , its been wiped , purely in vlan 1 , can you explain what you mean , devices connected are not receiving an IP address of the DHCP router/switch when connected to the switch ?


######################################
enable secret PASSWORD
!
username NAME secret PASSWORD


line vty 0 4
exec-timeout 30 0
length 0
transport input ssh
login local
###########################
Turn on SSH

ip ssh time-out 60
ip ssh authentication-retries 2
ip ssh source-interface Vlan1
ip ssh version 2

crypto key generate RSA
then hit return type 2048 and hit return again , that will enable SSH
#########################################

You will need a default gateway too for return traffic usually the router IP is the gateway , ip default-gateway x.x.x.x

############################################

Check what options you have for POE , its on by default , go into the interface and type ---power inline ?

[D3savage]

Thanks for your reply I will give it a go..........