Inter VLAN Routing Non-Operational?

[NicP270591]

Hi all,

I have set up a 2811 with seperate VLANs for phones, and another for computers/printers. Fa0/0 is trunked to a 3560 switch, which has all end devices plugged in. I have enabled the IP Routing commands on both devices, and from advice turned off proxy-arp on the VLANs on the router (unsure if this is causing the issue). The setup is as follows

Computer VLAN = 192.168.20.0

Phone VLAN = 192.168.50.0

Both on the same subnet, along with a router loopback address in the same subnet, at 192.168.10.1.

I am having an issue understanding why, but if I try to ping a phone from a PC it times out. Or if I try to type the phone's IP into an internet browser to get the phone's GUI on screen, it fails. This should not be happening as IP routing has been enabled on both, and everything is in the same subnet, correct? PC's can ping other PC's and network printing works fine. Phones register and operate fine, but the two VLAN's will not interoute.

Furthermore if I try and ping the router's loopback from the switch, it fails. But the trunk is up and operational because DHCP and devices work within their own VLAN. If I try to ping end devices from the switch, it returns 100%. There seems to be an issue with the router looping the different networks together.

What am I missing here?

Nic.

[tobyarnett]

Also you should disable the layer 3 routing on your switch. Unless you have a need for it you should allow your swich to just manage your switching and your router for the IPs. With that in mind what gateways are you using on your devices? Are your devices using the router as the gateway? Having an IP on your switch in the vlan 12 or some other vlan is sufficient for management of the device but given your config seems excessive to IP each vlan on your switch.

Toby


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[tobyarnett]

Nick,


On your loopback interfaces you could just make those /32 subnets. Add a default route on your switch to the routers loopback. Remove the unneeded vlan interfaces. Add a route on your router to point back to your switch loopback. Your devices work because they are using the router as their gateway. When your on the switch you only have access to vlan 99 since you have no dynamic routing protocol and no default routes.

On your switch:

Interface loopback0
ip address 192.102.10.2 255.255.255.255
!
IP route 0.0.0.0 0.0.0.0 192.102.99.1
!
!this is just clean up. Not needed for function.
No interface vlan 11
!
No interface vlan 12
!
No interface vlan 20
!
No interface vlan 50


Router

Interface loopback0
ip address 192.102.10.1 255.255.255.255
!
IP router 192.102.10.2 255.255.255.255 192.102.99.2



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[paul driver]

Hell Nic,

I was on the understanding this issue was resolved - If i remember you had an eariler post (which seems to have been removed) stating that it was due to this client machine having slso a  wlan nic card enabled at the same time which resulted in two default-gatways?

I am correct?

res

Paul

Please don't forget to rate this post if it has been helpful.

[NicP270591]

UPDATE

I have cleaned up the configuration as suggested above, released and renewed DHCP on the computers, saved the configs and reloaded the router and switch. Unsure as to what the fix was, but it all works fine now.

Thank you to all for your help!!

Nic.

[paul driver]

Hello Nic

Please don't forget to rate ANY post if it has been helpful.

[NicP270591]

Hi pdriver,

I have rated all helpful posts. Thank you for all your help.

Nic.