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.

New Member

cisco 3750 VLAN

Dear

I would like to make 1 VLAN100 in 3750 totally separate from other few VLAN1,2,3,4,5 in cisco 3750 with routable.  This 3750 I will going to use EIGRP.  Please help.

VLAN100 cannot be routed (I just need it for public internet sharing)

VLAN1, VLAN2, VLAN3, VLAN4, VLAN5 can be routed each other (for internal subnet routing)

Can i arrange like above and make it in 3750 ?                 

Everyone's tags (2)
3 ACCEPTED SOLUTIONS

Accepted Solutions
New Member

Re: cisco 3750 VLAN

If you are just going to use VLAN100 for L2-transport and it will be routed by the ISP-router you can just create VLAN100 on your switches and not create any VLAN100-interfaces or include them in your routing process.

Silver

Re: cisco 3750 VLAN

Hi Alan,

Just like Simen said, DON'T create interface vlan 100 and it should be ok. Create only vlan 100.

For vlans 1,2,3,4,5 create vlans in a common manner and also create the appropriate interfaces. Enable ip routing on your switch and you are done.

For other routing purposes (connection to other routers, ISP) you can use the EIGRP you mentioned.

Best regards,

Jan

Cisco Employee

Re: cisco 3750 VLAN

Alan,

Yes you are correct.

conf t # vlan 10  >>> This will create vlan 10 in the vlan database.

Conf t# int vlan 10 >>> This will create interface vlan 10.

NOTE: Interface vlan to be up and running,  you need to have the vlan 10 present in the vlan database and there should be one link which is up and forwarding the vlan 10. (Either assign the access port to vlan 10 or if you have any trunk port that makes the vlan to be up if that trunk port is configured to allowed vlan all.).

* Only if you want routing to be enabled between the networks have an ip address assign to every VLAN. Any VLAN which you dont want routing dont have an ip address assign to it.

HTH

Regards

Inayath

4 REPLIES
New Member

Re: cisco 3750 VLAN

If you are just going to use VLAN100 for L2-transport and it will be routed by the ISP-router you can just create VLAN100 on your switches and not create any VLAN100-interfaces or include them in your routing process.

Silver

Re: cisco 3750 VLAN

Hi Alan,

Just like Simen said, DON'T create interface vlan 100 and it should be ok. Create only vlan 100.

For vlans 1,2,3,4,5 create vlans in a common manner and also create the appropriate interfaces. Enable ip routing on your switch and you are done.

For other routing purposes (connection to other routers, ISP) you can use the EIGRP you mentioned.

Best regards,

Jan

New Member

Re: cisco 3750 VLAN

Dear

Can you tell how can I not to create interface of vlan? What is the command?

Normally, I use command

#interface Vlan100
Sent from Cisco Technical Support iPhone App

Cisco Employee

Re: cisco 3750 VLAN

Alan,

Yes you are correct.

conf t # vlan 10  >>> This will create vlan 10 in the vlan database.

Conf t# int vlan 10 >>> This will create interface vlan 10.

NOTE: Interface vlan to be up and running,  you need to have the vlan 10 present in the vlan database and there should be one link which is up and forwarding the vlan 10. (Either assign the access port to vlan 10 or if you have any trunk port that makes the vlan to be up if that trunk port is configured to allowed vlan all.).

* Only if you want routing to be enabled between the networks have an ip address assign to every VLAN. Any VLAN which you dont want routing dont have an ip address assign to it.

HTH

Regards

Inayath

224
Views
0
Helpful
4
Replies