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VLANs that assigned to different subnets

Posted on 2016-08-17

3 solutions

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Last Modified: 2016-08-22

I received an excel with list of VLANs that were matched with different subnets. For example,
vlan 10 - 192.168.10.0/24
vlan 11 - 192.168.30.0/24
vlan 12 - 192.168.50.0/24
vlan 13 - 192.168.100.0/24
But how can I verify if this information in Cisco switch? I tried different commands (show vlan, show interface trunk...etc.) but still could not find such info? could someone please help?

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Question by:techy98

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4 Comments

LVL 4

Assisted Solution

by:Steven Roman

Steven Roman earned 400 total points

ID: 417595702016-08-17

Hello

The VLANS can be any number, they do not need to match but it is a good practice to follow if you can

show ip int brief will show the interfaces and IP
You may have SVI (VLAN interface)

sh int vlan10 or show running-config | sec interface Vlan10

Try that out

Also there may not be any SVI if you are uplinking to a Router. The router may have sub interfaces and trunk ports Example g0/0.10

Hope this helps

Thanks

LVL 12

Assisted Solution

by:Bryant Schaper

Bryant Schaper earned 400 total points

ID: 417597592016-08-17

I would also say check the router, or layer 3 device, you can do a show ip int br, and a show run and look for the sub interfaces on a interface, they will have a dot1q associated vlan for example here what one of my routers shows:

interface GigabitEthernet0/0
no ip address
duplex auto
speed auto
!
interface GigabitEthernet0/0.1
encapsulation dot1Q 1 native
ip address 192.168.2.1 255.255.255.0 secondary
ip address 10.100.1.1 255.255.255.0
ip helper-address 10.0.5.92
ip nat inside
ip virtual-reassembly in
!
interface GigabitEthernet0/0.2
encapsulation dot1Q 2
ip address 10.100.2.1 255.255.255.0
ip nat inside
ip virtual-reassembly in
!
interface GigabitEthernet0/0.3
description Security VLAN
encapsulation dot1Q 3
ip address 10.10.10.1 255.255.255.0 secondary
ip address 10.100.3.1 255.255.255.0
ip nat inside
ip virtual-reassembly in
!
interface GigabitEthernet0/0.4
encapsulation dot1Q 4
ip address 10.100.4.1 255.255.255.0
ip helper-address 10.0.5.92
ip nat inside
ip virtual-reassembly in
!
interface GigabitEthernet0/0.5
encapsulation dot1Q 5
ip address 10.100.5.1 255.255.255.0
ip nat inside
ip virtual-reassembly in

on the switch side I have

interface GigabitEthernet1/0/23
description Uplink Router
switchport mode trunk
!
interface GigabitEthernet1/0/24
description Uplink PHXSW02
switchport mode trunk
!
interface GigabitEthernet1/0/25
!
interface GigabitEthernet1/0/26
!
interface GigabitEthernet1/0/27
!
interface GigabitEthernet1/0/28
!
interface Vlan1
ip address 10.100.1.5 255.255.255.0
!
interface Vlan2
ip address 10.100.2.5 255.255.255.0
!
interface Vlan3
ip address 10.100.3.5 255.255.255.0
!
interface Vlan4
ip address 10.100.4.5 255.255.255.0

LVL 31

Accepted Solution

by:Predrag

Predrag earned 1200 total points

ID: 417633812016-08-19

The same thing as Steven Roman and Bryant Schaper wrote, but to extract only needed information.

# sh run | i interf|address|encaps

Author Closing Comment

by:techy98

ID: 417663692016-08-22

thanks all. sh int bri worked fine but the command suggested by predrag was even able to see secondary ip assigned for a vlan

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