Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

Layer3 Routing!!!!

I am having a Layer 3 switch in my Environment. I am little bit confused how to enable Routing in L3 switch. I am going to use the L3 switch as a Routable device between my VLANS situated in L2 environment.

Can anyone help me in doing this?

Thanks in Advance.

Regards,

Guru Prasad.R

  • Other Network Infrastructure Subjects
1 ACCEPTED SOLUTION

Accepted Solutions

Re: Layer3 Routing!!!!

Hi Guru,

What you want is intervlan routing on layer 3 switch.

Now there must be some pure layer 2 switches on which you must be having vlans.

From that switch you connect your layer 3 switch and configure both the sides as trunk interface.

Now on layer 3 switch first enable "ip routing" command on global config mode.

Then create vlans first on your layer 3 switch and for those vlans create layer 3 interfaces which are logical interfaces and assign them an ip address.

You can configure layer 3 interfaces with command

interface vlan and then you will be in interface config mode and then assign an ip address

switch#config t

switch(config)#interface vlan

switch(config-if)#ip address

switch(config-if)#no shut

Also check this link for configuring intervlan routing on layer 3 switch

http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a008015f17a.shtml

HTH, if yes please rate the post.

Ankur

3 REPLIES
Silver

Re: Layer3 Routing!!!!

Hello Guru,

You can enable ip routing on a multilayer switch by entering "ip routing", if it is not already enabled.

To route between VLANs you need to create a switched virtual interface.

switch(config)#interface vlan109

switch(config-if#ip address 109.20.243.4 255.255.255.0

Repeat this task for every VLAN that requires Inter-VLAN routing.

HTH

--Leon

* Please rate posts

Re: Layer3 Routing!!!!

Hi Guru,

What you want is intervlan routing on layer 3 switch.

Now there must be some pure layer 2 switches on which you must be having vlans.

From that switch you connect your layer 3 switch and configure both the sides as trunk interface.

Now on layer 3 switch first enable "ip routing" command on global config mode.

Then create vlans first on your layer 3 switch and for those vlans create layer 3 interfaces which are logical interfaces and assign them an ip address.

You can configure layer 3 interfaces with command

interface vlan and then you will be in interface config mode and then assign an ip address

switch#config t

switch(config)#interface vlan

switch(config-if)#ip address

switch(config-if)#no shut

Also check this link for configuring intervlan routing on layer 3 switch

http://www.cisco.com/en/US/tech/tk389/tk815/technologies_configuration_example09186a008015f17a.shtml

HTH, if yes please rate the post.

Ankur

Re: Layer3 Routing!!!!

Ankur,

Thanks for your help in replying my posting. The link helped me a lot and i got live experience how to configure a switched environment.

Your reply resolved my issue.

Thanks & Regards,

Guru Prasad.R

108
Views
3
Helpful
3
Replies