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Segment VLAN into smaller VLANS?

thienphongtran
Level 1
Level 1

Can i create smaller VLANs from a VLAN? and How to do that?

Ex: I use a multiple switch 1 to create 2 VLAN (vlan1 and vlan2) and assign 1 ip address to each VLAN (vlan1: 1.1.1.1/24, vlan2: 1.1.2.1.1/24). as demanding, I want to segment vlan2 into 10 smaller VLANs and then assign ip to them without any changes in multiple switch 1. use a different multiple switch?

Help me!

6 Replies 6

Philip D'Ath
VIP Alumni
VIP Alumni

Generally, each VLAN needs a non-overlapping subnet - so you would need to change your IP addressing to introduce more VLANs.

 

Depending on your needs (and switches), you could consider using private vlans or private edge vlans.

 

Actually i am very new on this. i dont know about private vlan or edge vlan. i wana segment my ip 1.1.2.1/24 into 20 subnets (my need in practice) but i didn't search any exams about subneting without using vlan. could you give me a solution? thanks!

The task is too complicated to take on for a beginner.  Ask a Cisco Partner for help.

https://locatr.cloudapps.cisco.com/WWChannels/LOCATR/openBasicSearch.do

@Philip D'Ath Thanks for your help!

Hello

 


@thienphongtran wrote:

Actually i am very new on this. i dont know about private vlan or edge vlan. i wana segment my ip 1.1.2.1/24 into 20 subnets (my need in practice) but i didn't search any exams about subneting without using vlan. could you give me a solution? thanks!


Once you have mastered subletting it quite a simple task to perform such calculation -I have attached a chart and a link for you to review and hopefully help you to begin to understand. review here

Now regarding your original query -  Each subnet would have a related vlan, So you would have in total  20 vlans  from the initial ip range of 1.1.2.0/24

This can be done by subnetting the 1.1.2.0/24 into 1.1.2.x/29  which will provide you with maximum of 32 subnets with 8 hosts within each subnet.


vlan 1 =  1.1.2.0  255.255.255.248  = /29 

vlan 2 =  1.1.2.8  255.255.255.248  = /29 

vlan 3 = 1.1.2.16  255.255.255.248  = /29 

vlan 4 = 1.1.2.24  255.255.255.248  = /29 

vlan 5 =  1.1.2.32 255.255.255.248 = /29 

vlan 6 =  1.1.2.40  255.255.255.248 = /29 

vlan 7 = 1.1.2.48  255.255.255.248 = /29 

vlan 8 = 1.1.2.56  255.255.255.248 = /29 

vlan 9 =  1.1.2.64  255.255.255.248  = /29 

vlan 10 =  1.1.2.72  255.255.255.248  = /29 

vlan 11 = 1.1.2.80  255.255.255.248  = /29 

vlan 12 = 1.1.2.88  255.255.255.248  = /29 

vlan 13 =  1.1.2.96 255.255.255.248 = /29 

vlan 14 =  1.1.2.104  255.255.255.248 = /29 

vlan 15 = 1.1.2.112  255.255.255.248 = /29 

vlan 16 = 1.1.2.120  255.255.255.248 = /29 

 

vlan 17 =  1.1.2.128  255.255.255.248  = /29 

vlan 18 =  1.1.2.136  255.255.255.248  = /29 

vlan19 = 1.1.2.144  255.255.255.248  = /29 

vlan 20 = 1.1.2.152  255.255.255.248  = /29 

vlan 21 =  1.1.2.160 255.255.255.248 = /29 

vlan 22 =  1.1.2.168  255.255.255.248 = /29 

vlan 23 = 1.1.2.176  255.255.255.248 = /29 

vlan 24 = 1.1.2.184  255.255.255.248 = /29 

vlan 25 =  1.1.2.192  255.255.255.248  = /29 

vlan 26 =  1.1.2.200  255.255.255.248  = /29 

vlan 27 = 1.1.2.208  255.255.255.248  = /29 

vlan 28 = 1.1.2.216  255.255.255.248  = /29 

vlan 29 =  1.1.2.224 255.255.255.248 = /29 

vlan 30 =  1.1.2.232  255.255.255.248 = /29 

vlan 31 = 1.1.2.240  255.255.255.248 = /29 

vlan 32 = 1.1.2.248  255.255.255.248 = /29 


res
Paul

 


Please rate and mark as an accepted solution if you have found any of the information provided useful.
This then could assist others on these forums to find a valuable answer and broadens the community’s global network.

Kind Regards
Paul

@paul driver thanks for reply!

can i aks you somethings else?

I have a multiple switch to separate into 2 vlan(vlan1: 1.1.1.0/24 and vlan2: 1.1.2.0/24) and another multiple switch to separate vlan2 into 20 smaller vlans. as same with below(that i created):a.Cisco.png

 

if this model can operate, i wonder how to connect 2 multiple switchs?

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