Inter-VLAN routing

Answered Question
May 21st, 2008

Hello everybody,

How do you configure Inter-VLAN routing in Cisco 4507R Catalyst switch. Thanks for your support.

-chie

I have this problem too.
0 votes
Correct Answer by ney25 about 8 years 6 months ago

Hi lazon,

kindly give rates for all netpro who replied you. :P

thanks.

Regards,

Jack

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lamav Wed, 05/21/2008 - 19:31

Native IOS, right?

(create vlan in layer 2)

vlan 2

name HR_vlan

(create Layer 3 interface)

interface vlan 2

ip address 10.10.10.1 255.255.255.252

(advertise network in routing protocol)

router eigrp 100

network 10.10.10.0 0.0.0.255

Repeat the same for each vlan. Build it in layer 2, create the routed SVI interface for the vlan, and advertise it under the routing protocol.

HTH

Victor

lazon Wed, 05/21/2008 - 19:41

Yes, it's using native IOS. Can you please explain further re: create the routed SVI interface for the vlan. Thanks again for your response.

-chie

srue Wed, 05/21/2008 - 19:51

you dont necessarily need a routing protocol like eigrp.

just create vlan interface for each vlan - the IP address you assign to these vlan interfaces should be the default gateway for the hosts on each of those vlan's.

turn on routing on your switch:

ip routing

lamav Wed, 05/21/2008 - 20:01

You need to create the layer 3/routed interface for the vlan. That is the SVI (switched virtual interface). Just think of that interface as the gateway into and out of your vlan. If a host on the vlan needs to send traffic to another host in another vlan, the traffic will have to be routed out the layer 3/SVI interface. Just think of an ethernet port on a router with all the hosts in that LAN sitting "behind" it.

And yes, turn on ip routing.

And as far as the routing protocol, you dont need it if you are going to route traffic between directly connected hosts, of course. I gave you the eigrp 100 part of the config as just a general approach, with the underlying assumption that you will want other areas of your network and beyond to reach the hosts in your vlans. Hence, the advertisement under a routing protocol. Pretty standard stuff...

HTH

Victor

psaravanan Wed, 05/21/2008 - 21:33

In Intervlan Routing,

IP routing is the best option.

you enable ip routing in configuration mode.

It automatically routing vlans.

bvsnarayana03 Wed, 05/21/2008 - 21:42

As already mentioned "ip routing" would do the trick when multiple SVI or vlan exists in a switch.

While you have to run a routing protocl if you need to communicate with subnets other than this switch e.g. on some other L3 switch or router.

lazon Wed, 05/21/2008 - 22:44

Thanks for all your responses, I'll try to play around with it base on your recommendations.

-chie

Correct Answer
ney25 Wed, 05/21/2008 - 23:10

Hi lazon,

kindly give rates for all netpro who replied you. :P

thanks.

Regards,

Jack

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