ethernet frame loop

Hi

following state. I have a switch with e.g. 48 userports and one uplink
port. This switch is a carrier grade switch which supports only
residential mode. Therefore all frames from the user ports are
forwarded to the uplink if. All frames are inside the same Vlan. at the
uplink port a router is connected.

Now a new requirement was defined which says sometimes for a special
Vlan a communication between each userport should be possible on
ethernet base. That means a routing via subnets with a 30 bit subnet
mask is not allowed.

And now the question. What can be the right configuration option for a
cisco router /L3 switch to ensure this functionality?

The high level engineers says there is some kind of option at cisco
edge router which enables some kind of packet loop. Normaly the
router/switch only forwards a package to all other ports at the same
vlan but it is prohibited to froward the frame to the same port.
This function should be disabled from my point of view.

thanks for your hints tips and hands of brain

.

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