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Community Member

Vlan Overlaping

Hi

I am using Jermey's new CBT nuggets for CCNA and was making topology on gns3 all is going well but when I tried to make vlan interfaces its give me this error.

interface vlan 64

ip address 10.1.64.1 255.255.254.0

description "Voice Vlan"

interface vlan 66

ip address 10.1.66.1 255.255.254.0

description "Data Vlan"

interface vlan 68

ip address 10.1.68.1 255.255.254.0

description "Server Vlan"

interface vlan 69

ip address 10.1.69.1 255.255.254.0

description "Public WiFi Vlan"

ip address 10.1.70.1 255.255.254.0

% 10.1.70.0 overlaps with Vlan71     (Error)

interface vlan 70

ip address 10.1.70.1 255.255.254.0

description "Private LAB Vlan"

ip address 10.1.70.1 255.255.254.0

% 10.1.70.0 overlaps with Vlan71 (Error)

How can I resolve this problem. and I jeremey is doing the same on gns3 lab and he didnt get any error but I am getting this error please give me the solution.

thanks in advance .

Regards

Faisal

Everyone's tags (3)
2 ACCEPTED SOLUTIONS

Accepted Solutions
Purple

Re: Vlan Overlaping

  It's overlapping because you already have it configured on vlan 71 .  You can only have a range on a single SVI or routed port on the L3 switch.  vlan 71 with the mask you have covers .70 and .71  subnets .  If you already have vlan 71 configured with the same mask that's why it is complaining as it is overlapping.

Purple

Vlan Overlaping

  If you use a /24 mask in your configs then you wouldn't have an issue.  The way you have it right now all your definitions cover 2 subnets  using  /23 mask .

6 REPLIES

Vlan Overlaping

What does vlan 71 look like? I don't see it in the config...

HTH, John *** Please rate all useful posts ***
Community Member

Re: Vlan Overlaping

yes its a vlan 71 and I am trying to config this ip address on vlan 71 and 69 but it gives me error vlan overlapping I have attached complete SW1 configuration you can check if you find any solution .

many thanks in advance

Purple

Re: Vlan Overlaping

  It's overlapping because you already have it configured on vlan 71 .  You can only have a range on a single SVI or routed port on the L3 switch.  vlan 71 with the mask you have covers .70 and .71  subnets .  If you already have vlan 71 configured with the same mask that's why it is complaining as it is overlapping.

Community Member

Re: Vlan Overlaping

Hi glen

thanks for your reply.

could you please guide me what mask should I use ad I watching the jeremey videos and I have done the same configuration but he didn't get any error only I got this error .

Purple

Vlan Overlaping

  If you use a /24 mask in your configs then you wouldn't have an issue.  The way you have it right now all your definitions cover 2 subnets  using  /23 mask .

Community Member

Re: Vlan Overlaping

thanks every one for your help and support

regards

Faisal

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