Please Confirm 3550 Catalyst VLAN setup

[Shaad]

I have a 3550 that I would like to split into 3 vlans.

All I have to do is create the vlan with
#vlan "vlan number"

then go into the config-if for an interface and set it to
the vlan I want by entering :

# switchport mode access
# switchport access vlan "vlan number"
# end

Will this do the trick for everything?

Also, putting a crossover cable from 1 Vlan to the other
should not cause a problem right? It should connect
the 2 networks together?

 

[rcasta]

Why do you want to plug a crossover!!

You need a router to allow communication between vlans. Unless your 35k has L3 software, then no need for connecting anything but your hosts.

I guess you need to enter into the vlan-database configuration mode.

cheers,

 

[baddos]

On the 3550 you have to turn on the router that is built in as well. In config mode type "ip routing", and that should do the trick. As long as you have given your vlans ip addresses for their subnets, and turned on routing it should work. There is no need to use a crossover cable to the same switch, because the switch will use it's backplane to do the transport between the vlans.

 

[Shaad]

I don't want to route anything.. I just want 3 seperate VLANS.

 

[baddos]

Ok... Then leave out the ip routing and the ip assignments.

 

[SkidPlate]

I think you might be missing the point of VLANs. Their commonly used to seperate network segments into their own broadcast domains (which normally have different network IP addresses).

Once you do this you will need a router to communicate between them, the 3550 is a good platform to do this with (configured as a router). Otherwise it's just a switch and all of it's ports are in the same broadcast domain.

 

[baddos]

Not true... He can setup the 3550 to have separate vlan's and turn off routing. He will be underutilizing his investment, but if he doesn't want to route he doesn't have too.

 

[nivasi]

Hi !!

Iam unable to get the exact information on encapsulation and how it will work and types of encapsulations can u help me the same..

Nivasi

 

[Shaad]

Indeed, I simply did not want some machines talking to each other. an aditional switch would have been the best, but I turned my current 3550 into 2 "virtual" switches using VLANS.

just used the #vlan vlannumber
and then went into my ports and typed
switchport access vlan vlannumber
and set it up. works great. I was just not used
to this way of doing it.