We help IT Professionals succeed at work.

Error adding IP to VLAN: overlaps with Vlan

crucialx asked
Last Modified: 2010-04-21
When trying to add an IP to a vlan, I'm getting the following error (eventhough based on my calculations it should work!). Does anyone now how to fix this?

switch(config)#int vlan 644
switch(config-if)#ip address x.x.247.81
x.x.247.80 overlaps with Vlan645

The configuration of vlan 645 is:

interface Vlan645
 description xx
 ip address x.x.247.89

And vlan 643:

interface Vlan643
 ip address x.x.247.65

The rest of the /24 is cut up as follows:

x.x.247.0/28 - vlan 624
x.x.247.16/29 - vlan 639
x.x.247.24/29 - vlan 640
x.x.247.32/28 - vlan 641
x.x.247.48/28 - vlan 642
x.x.247.64/28 - vlan 643
x.x.247.80/29 - vlan 644
x.x.247.88/28 - vlan 645
x.x.247.104/29 - vlan 646
x.x.247.112/29 - vlan 647
x.x.247.120/29 - vlan 648
x.x.247.128/29 - vlan 649
x.x.247.136/29 - vlan 651
x.x.247.144/28 - vlan 652
x.x.247.160/27 - vlan 653
x.x.247.192/29 - vlan 654
x.x.247.200/29 - vlan 655

Any ideas why I'm getting this error?
Watch Question

it really overlaps :)
here it is:
x.x.247.64/28 - vlan 643
x.x.247.80/29 - vlan 644
x.x.247.88/29 - vlan 645

these should be correct


Hi from_exp,

Why can't I do the following?

x.x.247.64/28 - vlan 643
x.x.247.80/29 - vlan 644
x.x.247.88/28 - vlan 645
This one is on us!
(Get your first solution completely free - no credit card required)


Thanks for your help!  This explanation is what i was looking for.
Unlock the solution to this question.
Join our community and discover your potential

Experts Exchange is the only place where you can interact directly with leading experts in the technology field. Become a member today and access the collective knowledge of thousands of technology experts.

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.


Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.