How to setup Inter Vlan communication?

[chikhong]

Hi all, i m new here.

i have a 3com 5500G as my core switch **bleep** router.

network infra was setup by previous SA.

Now i need to create new vlan.

i created new vlan and configure dhcp-server.

then i trunk to a 3com 4500 which workstation connect to.

i manage to get IP.

Problem is i cannot communicate with other Vlan.

any help will be much appreciate.

[Fred_Mancen_1]

As your 5500G is the core switch, you have to create an VLAN Interface to each VLAN ID you need to route.

Example:

If you have created the VLAN IDs 20, 34 and 50 in addition to the default VLAN 1, you have to create the VLAN interfaces in the core switch, using the following template:

interface vlan 20

ip address <ip_address> <mask>

description <description>

interface vlan 34

ip address <ip_address> <mask>

description <description>

interface vlan 50

ip address <ip_address> <mask>

description <description>

If you already has enabled the permission to pass all existing VLANs trhough the trunk, the interfaces will came up and it will be routed automatically by the core switch (5500G). These IP addresses that you create in the VLAN interfaces are the gateways of its own VLAN ID.

Remember that the VLAN ID is the Layer 2 segment and the VLAN interfaces (IP addresses) are the Layer 3 network segments.

HTH

[chikhong]

Hi Fred, thanks for your reply.

interface Vlan-interface1 

ip address 192.168.2.1 255.255.255.0 

rip version 2 multicast

interface Vlan-interface4 

ip address 192.168.103.1 255.255.255.0

dhcp-server 0 

udp-helper server 192.168.0.15

udp-helper server 192.168.0.10 

rip version 2 multicast

interface Vlan-interface170 

ip address 192.168.170.1 255.255.255.0 

dhcp-server 0 

udp-helper server 192.168.0.10 

udp-helper server 192.168.0.15 

rip version 2 multicast

VLan ID 4 is an existing VLAN.

this vlan able to communicate with all other vlan

VLAN 170 is the 1 i created. 

i was able to obtain IP from my workstation but cannot communicate with all other VLAN.

i'm new in networking. hope any can help.

[Fred_Mancen_1 · Accepted solution]

Make sure that your DHCP server is providing the correct default gateway.

HTH

[chikhong]

Hi

i already double check. DHCP server is providing correct default gateway which is 192.168.170.1

i was able to ping 192.168.170.1 from my PC which getting IP 192.168.170.51

but i still cannot ping others VLAN in my network.

[chikhong]

thanks fred. i was so careless to put default gateway to 107.1 instead of 170.1