ethernet loop required

ethernet loop required

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Subject Author Date
ethernet loop required iwetzel 07-24-2006
Posted by on July 24, 2006, 1:33 pm
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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
router /L3 switch (cisco/extreme)to ensure this functionality?

The high level engineers says there is some kind of option at some
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


Pure Networks
Posted by iwetzel@gmx.net on July 25, 2006, 11:26 am
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Hello again

now a can specify my request a little bit more

I have to enable a proxy arp at the edge router for the hole ip subnet.
afterwards the router should anser each arp request with his own MAC.
Ho i configure this at Alpine/Summit/Cisco/ERX

Best regards


iwetzel@gmx.net wrote:
> 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
> router /L3 switch (cisco/extreme)to ensure this functionality?
>
> The high level engineers says there is some kind of option at some
> 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


Posted by glen herrmannsfeldt on July 25, 2006, 7:07 pm
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iwetzel@gmx.net wrote:

> 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.

I am not so sure about the answer to your question, but I don't
believe it is an ethernet question. If it involves routing, then
comp.dcom.lans.tcp-ip would be a better choice to ask.

-- glen


Posted by Rick Jones on July 25, 2006, 8:07 pm
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> comp.dcom.lans.tcp-ip would be a better choice to ask.

did you mean comp.protocols.tcp-ip?

rick jones
--
firebug n, the idiot who tosses a lit cigarette out his car window
these opinions are mine, all mine; HP might not want them anyway... :)
feel free to post, OR email to rick.jones2 in hp.com but NOT BOTH...

Posted by glen herrmannsfeldt on July 26, 2006, 1:16 am
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Rick Jones wrote:


>>comp.dcom.lans.tcp-ip would be a better choice to ask.

> did you mean comp.protocols.tcp-ip?

Oops, yes.

thanks,

-- glen


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