[c-nsp] VS broadcast address relaying from Vlan to Vlan

[Alex]

Hi there,
Have a look into "UDP broadcast flooding" 
http://www.cisco.com/en/US/tech/tk1330/technologies_case_study_chapter09186a0080759920.html#wp3321
and "bridging between 802.1Q VLANs" 
http://www.cisco.com/en/US/docs/ios/12_1t/12_1t3/feature/guide/dtbridge.html
The second is required if you wish to flood UDP broadcasts between 
subinterfaces.
I did a setup like this 5 years ago on a 7206 and it worked like a charm.
Rgds
Alex

----- Original Message ----- 
From: "Arne Larsen / Region Nordjylland" <arla at rn.dk>
To: <cisco-nsp at puck.nether.net>
Sent: Monday, March 10, 2008 3:47 PM
Subject: [c-nsp] VS broadcast address relaying from Vlan to Vlan


> Hi Folks.
>
> I hope someone can help me out here. I have a problem with devices from a 
> supplier to our ventilation system.
> There units are IP based, but they aren't very clever units. When the 
> temperature is being propagated to all units the sending device sends it 
> to the broadcast address on its own LAN.
> Furthermore the devices are sending information to each other the same 
> way, by sending to the broadcast address.
> So as long all devices is on the same broadcast domain everything works 
> fine. The units sends to port 49152 udp on the broadcast address.
> But, there can only be 32 units on each broadcast domain for some reason 
> that I'm not aware off.
> So I have to segment it into more VLan on our core switch (its 6500).
> Now, how do I propagate the packets that are sent to a broadcast address 
> on one VLan to all others VLan.
> I've setup helper-addresses for relaying the broadcast traffic to the 
> broadcast address on all others VLan and I've appended port 49152 udp in 
> the forward-protocol.
>
> Here is the what I've tried to get working, but it's not.
>
>
> interface Vlan400
> ip address 10.8.40.1 255.255.255.192
> ip broadcast-address 10.8.40.63
> ip helper-address 10.2.40.127
> ip helper-address 10.2.40.191
> ip directed-broadcast
>
> interface Vlan401
> ip address 10.8.40.65 255.255.255.192
> ip broadcast-address 10.8.40.127
> ip helper-address 10.2.40.191
> ip helper-address 10.2.40.63
> ip directed-broadcast
> !
> interface Vlan402
> ip address 10.8.40.129 255.255.255.192
> ip broadcast-address 10.8.40.191
> ip helper-address 10.2.40.63
> ip helper-address 10.2.40.127
> ip directed-broadcast
>
>
>
>
> /Arne
>
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