topic Routing to multinetted VLAN in Switches, Hubs, and Modems

Routing to multinetted VLAN

Yan Henrichon — Thu, 28 Jan 2010 14:29:29 GMT

Hi.

Very simple question.
VLAN 1 -> 10.0.0.254
VLAN 2 -> 192.168.76.254 and 192.168.100.254.
IP Routing is enabled.

It surely possible to a device in VLAN 1 to communicate to a device in 192.168.100.0 scope in VLAN 2. How can I achieve this?

Thank you.

Re: Routing to multinetted VLAN

Jeff Carrell — Thu, 28 Jan 2010 14:46:57 GMT

as long as client in vlan 1 has a default gateway of 10.0.0.254 and the client in vlan 2 has a default gateway of 192.168.100.254, then they can communicate with each other...

this assumes the only router is this switch...

if the DHCP server is in vlan 1, and you need devices to get a DHCP address for either of the vlan 2 subnets, then in vlan 2 context add 'ip helper-address 10.0.0.x' and add the 2 scopes of vlan 2 subnets in the DHCP server...

hth...jeff

Re: Routing to multinetted VLAN

Yan Henrichon — Mon, 01 Feb 2010 13:44:58 GMT

Jeff,

Here is the config of my switch. I can ping VLAN 1 IP Address and 192.168.76.254 but I can't ping 192.168.100.254. Can you tell why?

vlan 1
name "DEFAULT_VLAN"
untagged 13-28
ip address 10.0.0.254 255.255.0.0
no untagged 1-12
exit
vlan 20
name "VLAN20"
untagged 1-12
ip address 192.168.76.254 255.255.255.0
ip address 192.168.100.254 255.255.255.0
ip helper-address 10.0.0.10
ip forward-protocol udp 10.0.0.13 2024
exit

Re: Routing to multinetted VLAN

Patrick Terlisten — Mon, 01 Feb 2010 14:00:46 GMT

Hello,

you have to enable ip routing in the configuration context of the switch. Just type "ip routing" and press enter. Then make sure that the clients in the VLANs habe the ip interface of the switch as default gateway configured.

Regards,
Patrick

Re: Routing to multinetted VLAN

Yan Henrichon — Wed, 03 Feb 2010 15:16:10 GMT

Hi Patrick,

Has mentionned in the initial post, IP Routing is enable. From the switch, I can ping all three gateways.

Thx

Re: Routing to multinetted VLAN

Yan Henrichon — Thu, 14 Apr 2011 13:00:01 GMT

Thank you