sub interface

[correa]

Hello i try to put five adrres ip on an interface gigabitethernet of my catalyst 3550, and i can' t do it and i don't know where is my error.This is my instruction i enter on my switch

c3550-12t(config)#interface gigabitethernet 0/1.1

c3550-12t(config-subif)#ip address 192.168.1.254 255.255.255.0

Configuring IP routing on a LAN subinterface is only allowed if that

subinterface is already configured as part of an IEEE 802.10, IEEE 802.1Q, or ISL vLAN.

So what i have to do THANKS.

[Prashanth Krishnappa]

You cannot configure subinterfaces. If you want to use subinterfaces to trunk and route like the router.. then you need to enable trunking on the port and then create vlan interfaces to route b/w the networks

Here is the URL that might help

http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12112cea/3550scg/swint.htm

[correa]

ok if i understant i need to créate Vlan, so if create Vlan i have an other proble how an i do to communacatie between Vlan with only my catalyst (becaus if i remember i need to have router for communicate Vlans)

thanks.

[Prashanth Krishnappa]

3550-12T should have EMI image and can route between VLANs. Create layer 3 VLAN interfaces for each VLAN you have

config terminal

interface VLAN 1

ip address x.x.x.x y.y.y.y

interface VLAN 2

ip address x.x.x.x y.y.y.y

.

.

.

interface VLAN x

ip address x.x.x.x y.y.y.y

[correa]

my question could be stupid but what i an EMI image

THANKS.

[Prashanth Krishnappa]

EMI stands for Enhanced multilayer software image

http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12112cea/ol325202.htm#21027

[psijnja]

here another link

http://www.cisco.com/en/US/products/hw/switches/ps628/products_configuration_example09186a00800ef797.shtml

Create a vlan.

Connect the router and the switch using a trunk

Confgure vlans on the switch

Configure sub interfaces on the router.

remember to bind the sub interface to a vlan.

Good luck

[correa]

ok thank but the problem is tha i don't have a router i have only a catalyst 3550, and to make an inter vlan routing i think need a router with my catalyst.

THANKS.

[7rbowenii]

correa,

The 3550 does both routing and switching. So, in fact, you can do both with the 3550. Here is the link to the document explaining the functions of the 3550s.

javascript:newWin('http://www.cisco.com/univercd/cc/td/doc/product/lan/c3550/12112cea/ol325202.htm#21027')

-bo

[psijnja]

You should make the port member of a vlan first.

and give it encapsulation and vlan number.

[Prashanth Krishnappa]

It will *NOT* work on the CAT3550. It's *NOT* supported