Sunday, April 5, 2020

VLSM Overlapping Issue

Hi All,

I am currently working on small network topology. I have created 13 VLANS and now would like to create SVI's for each in order to route between them. Here is the issue, I have a VLSM subnet scheme which I checked multiple times and should be correct, I started creating SVI' and assigning the IP's until I reached one of the VLANS and every next one gives me an error for overlapping with interface.

Below I have the VLSM scheme together with the error I get on Packet Tracer. Can someone guide me on what is wrong since I am stuck?

IP SCHEME:

HQ VLANS SVI

VLAN SVI's Number Name IP Mask Dec Mask

10 IT-VLAN 172.16.0.192 /28 255.255.255.240

20 Marketing-VLAN 172.16.0.144 /28 255.255.255.240

30 HR-VLAN 172.16.0.128 /28 255.255.255.240

40 Distribution-VLAN 172.16.0.96 /28 255.255.255.240

50 Finance-VLAN 172.16.0.112 /28 255.255.255.240

60 Billing/Sales-VLAN 172.16.0.208 "/29 " 255.255.255.248

70 Reception-VLAN " 172.16.0.160" /28 255.255.255.240

80 Guests-VLAN 172.16.0.32 /27 255.255.255.224

90 Head-VLAN " 172.16.0.176" /28 255.255.255.240

100 CCTV-VLAN 172.16.0.80 /28 255.255.255.240

110 AccessPoints-VLAN 172.16.0.64 /28 255.255.255.240

120 Voice-VLAN 172.16.0.0 /27 255.255.255.224

Error on SWITCH (Layer3):

HQ_RK1_SWL3_01(config)#int vlan 50

HQ_RK1_SWL3_01(config-if)#ip address 172.16.0.113 255.255.255.240

% 172.16.0.112 overlaps with GigabitEthernet1/0/1

Thanks in advance!



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