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New Member

Vlan overlapping

hi all,

i have three vlan as mentioned below-

int vlan 80

ip add 10.101.108.129 255.255.255.224

int vlan 90

ip add 10.101.108.161 255.255.255.224

int vlan 100

ip add 10.101.108.193 255.255.255.224

my prob is i want to delete this two vlan 90 & 100 and want to make one another vlan called vlan 120

int vlan 120

ip add 10.101.108.161 255.255.255.192

but whenever i try to do so it gives a error- 10.101.108.128 overlapping vlan 80.

and does not allow to give ipp add to vlan 120.

plz suggest

2 ACCEPTED SOLUTIONS

Accepted Solutions
New Member

Re: Vlan overlapping

Hi,

the range of vlan 80 is 10.101.108.129-158, and the range of vlan 120 is 10.101.108.129-190. So the range of host addresses is overlapping. It's early morning here in germany, hope i'm right...:-)

Greetings, Stephan

Cisco Employee

Re: Vlan overlapping

int vlan 80

ip add 10.101.108.129 255.255.255.224

The above vlan is for IPs from .129-.159

10.101.108.129 - Network ID

10.101.108.130 - First Host

10.101.108.158 - Last Host

10.101.108.159 - Broadcast ID

--------

int vlan 120

ip add 10.101.108.161 255.255.255.192

The above vlan is for IPs from .129-.191

10.101.108.129 - Network ID

10.101.108.130 - First Host

10.101.108.190 - Last Host

10.101.108.191 - Broadcast ID

This explains the overlap - IPs from .129-.159 are a part of VLAN 80 already.

You may use the network 10.101.108.192/26 for VLAN 120.

HTH

~Vaibhav

2 REPLIES
New Member

Re: Vlan overlapping

Hi,

the range of vlan 80 is 10.101.108.129-158, and the range of vlan 120 is 10.101.108.129-190. So the range of host addresses is overlapping. It's early morning here in germany, hope i'm right...:-)

Greetings, Stephan

Cisco Employee

Re: Vlan overlapping

int vlan 80

ip add 10.101.108.129 255.255.255.224

The above vlan is for IPs from .129-.159

10.101.108.129 - Network ID

10.101.108.130 - First Host

10.101.108.158 - Last Host

10.101.108.159 - Broadcast ID

--------

int vlan 120

ip add 10.101.108.161 255.255.255.192

The above vlan is for IPs from .129-.191

10.101.108.129 - Network ID

10.101.108.130 - First Host

10.101.108.190 - Last Host

10.101.108.191 - Broadcast ID

This explains the overlap - IPs from .129-.159 are a part of VLAN 80 already.

You may use the network 10.101.108.192/26 for VLAN 120.

HTH

~Vaibhav

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