ZyXEL Communications Dimension GS-3012 Manual

IPSubnetting VLAN

Ethernet Switch

ZyNOS 3.8

Support Notes

Version 3.80

September 2007

IPSubnetting VLAN

Overview

Subnet based VLANs allow users to group traffic into logical VLANs based on the

source IP address and IP subnet. When a frame is received on a port, the switch

checks where the IP subnet it came from and what the source IP address is. The

untagged packets from the same IP subnet are then placed in the same subnet

based VLAN. The most significant advantage of using subnet based VLANs is that

the priority can be divided and tuned base on what VLAN the traffic belongs to.

Scenario

Considering the following topology:

Purpose:

Traffic from VoIP phone (source IP: 192.168.1.10) will be categorized into VLAN 3.

Traffic from IPTV (source IP: 192.168.5.10) will be categorized into VLAN 4.

Traffic from the PC (source IP: 192.168.10.10) will be categorized into VLAN 5.

IPSubnetting VLAN

When there are different IP services requirement behind a modem (e.g. VoIP, IPTV,

and Common data networking). To separate the IP services in the edge site, we can

classify different VLANs for each IP service.

By distinguishing each service, Service Providers can do further policy controlling for

each VLAN.

In this topology, three IP services are needed by customer, VoIP, IPTV, and general

network access. Each client belongs to different IP subnets. We can achieve this

purpose using the switch with IPSubnetting VLAN function.

IPSubnetting VLAN

Configuration using the Web GUI

1. Connect the MGMT port to a PC or Notebook with the RJ45 Cable.

2. By default, the MGMT IP address of the out-band port is 192.168.0.1/24

3. Set your NIC to 192.168.0.100/24

4. Open an Internet browser (e.g. IE) and enter http://192.168.0.1 into the URL field.

5. By default, the username for the administrator is “admin” and the password is

“1234”.

6. After successfully logging in you will see a screen similar to the one below.

7. Go to “Static VLAN” page by clicking “Advanced Application”Æ”VLAN”Æ”Static

VLAN”

IPSubnetting VLAN

8. Create VLAN 3, include port 1 and port 2. Port 1 connects to the modem and

packets going in and out this port shouldn’t have VLAN tag. Port 2 connects to the

router in the CO, and packets going in and out port 2 should have different VLAN tags

according to its IP address. Click “Add”.

IPSubnetting VLAN

9. Create VLAN 4, include port 1 and port 2. Port 1 connects to the modem and

packets going in and out this port shouldn’t have VLAN tag. Port 2 connects to the

router in the CO, and packets going in and out port 2 should have different VLAN tags

according to its IP address. Click “Add”.

10. Create VLAN 5, include port 1 and port 2. Port 1 connects to the modem and

packets going in and out this port shouldn’t have VLAN tag. Port 2 connects to the

router in the CO, and packets going in and out port 2 should have different VLAN tags

according to its IP address. Click “Add”.

IPSubnetting VLAN

11. Go to “VLAN Port Setting” page by clicking “Advanced Application” Æ“VLAN”

Æ“VLAN Port Setting”

12. Go to “Subnet Based VLAN” page.

IPSubnetting VLAN

13. In the “Subnet Based VLAN” page, first we have to activate this function. Check

the “Active” check box to enable it. Click “Apply”

14. Create the Subnet Based VLAN entry for the VoIP phone.

Here we see that packets from 192.168.1.10/24 will be attached a VLAN tag 3 and its

IPSubnetting VLAN

priority will be set to 2. Click “Add”

15. Create the Subnet Based VLAN entry for the IPTV device.

Here we see that packets from 192.168.5.10/24 will be attached a VLAN tag 4 and its

priority will be set to 5. Click “Add”

16. Create the Subnet Based VLAN entry for the PC.

Here we see that packets from 192.168.10.10/24 will be attached a VLAN tag 5 and

its priority will be set to 7. Click “Add”

IPSubnetting VLAN

Configuration using the CLI

vlan 1

name 1

normal ""

fixed 1-28

forbidden ""

untagged 1-28

ip address 192.168.1.1 255.255.255.0

exit

vlan 3

name "VLAN 3"

normal 3-28

fixed 1-2

forbidden ""

untagged 1

exit

vlan 4

name "VLAN 4"

normal 3-28

fixed 1-2

forbidden ""

untagged 1

exit

vlan 5

name "VLAN 5"

normal 3-28

fixed 1-2

forbidden ""

untagged 1

exit

interface route-domain 192.168.1.1/24

exit

ip address 192.168.0.1 255.255.255.0

subnet-based-vlan

subnet-based-vlan name VoIP source-ip 192.168.1.10 mask-bits 24 vlan 3 priority 2

subnet-based-vlan name IPTV source-ip 192.168.5.10 mask-bits 24 vlan 4 priority 5

subnet-based-vlan name PC source-ip 192.168.10.10 mask-bits 24 vlan 5 priority 7

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