Ping issue

teximo19

What should be done in order to send ping between two hosts in different vlans. They are at the same subnet and no L3 device on the medium. Or nothing more required to achive ping messages.

Regards.

networker050184

They need to be in the same VLAN unless you bring an L3 device into the mix.

nice343

you cannot have 2 different vlans with the same subnets.

It has to be different subnets. And they can only coimmunicate if a layer3 device is present.

montanablue2

Actually you can ping between two different VLAN's on the same subnet if you set up a BVI interface instead of a SVI interface to link the two. A BVI can bridge between the two VLANs so they can both be on the same subnet. I don't think it's recommended by Cisco however. They call it "fallback bridging" if I remember rightly.
I had it set up by someone else on my last corporate network I administered and it was a $%$#% to migrate off of.

tech-airman

teximo19 wrote:

What should be done in order to send ping between two hosts in different vlans. They are at the same subnet and no L3 device on the medium. Or nothing more required to achive ping messages.

Regards.

teximo19,

What you should do is to use an L3 device between the two VLANs. What you also should do is to use different subnets for the different VLANs. You can achieve ping messages of "destination unreachable" by currently doing nothing more.

darkuser

the only way to solve what you originally described would be to bridge the two vlans.

dtlokee

You can't fallback bridge IP traffic on a switch, only traffic the switch can't route. You can use proxy arp if you subnet correctly.

montanablue2

Thanks to dtlokee for correcting me. I was getting my terms mixed up. BVI's are associated with Integrated Routing and Bridging, which can bridge IP addresses. Fallback Bridging, like he said, cannot bridge IP.