Re: broadcast question

 ip helper-address and ip forward-protocol to change the port information
used? Just have multiple helpers on the receiving interface. (Tell 'em
to use the broadcast of the receiving interface)

Then helper it to the broadcast of the other four LAN's local broadcast
addresses.

Please note, I haven't tried this.... Just pondering the question before
I jump on a conference call. :)

Scott

Jersey Guy wrote:

  Thanks Santiago, Marko, all,
  The problem is that the vendor doesn't do multicast. They do UDP broadcast
  only. and yes, the main objective is to save WAN bandwidth.
  
  Instead of them sending 4 x broadcasts, one per /26 subnet, I want them to
  send one broadcast for the /24, then have the router forward it to each of
  the /26s. Just wondering if there's some way of configuring this on the
  router..?
  
  On Tue, Mar 2, 2010 at 1:06 PM, Santiago Enciso <santiago.enciso_at_gmail.com> wrote:

    JG, if you want to save bandwidth use multicast to transport the broadcast
    traffic until you reach the last hop router. You can achieve this
    implementing:
    
    http://www.cisco.com/en/US/docs/ios/ipmulti/configuration/guide/imc_inter_mc_helper_ps6441_TSD_Products_Configuration_Guide_Chapter.html
    If the last hop router ends all the /26 networks in the same interfaces
    that goes to the same switch you can share the same multicast stream between
    diferent vlans of the same switch with MRV.
    
    Hope this clarifies.

    Santiago E

    On Tue, Mar 2, 2010 at 2:35 PM, Jersey Guy <guy.jersey_at_gmail.com> wrote:

      Sorry, let me clarify.
      
      In some situations (small offices), we'll have one /26 on say Eth0 of the
      router and one /26 on Eth1 of the same router. In bigger offices, we'll have
      one /26 hanging off a switch on one floor, another /26 on another vlan in a
      different floor & switch and so on...
      
      thanks, JG

      On Tue, Mar 2, 2010 at 12:30 PM, Santiago Enciso < santiago.enciso_at_gmail.com > wrote:

> sitting on the same router's LAN interfaces
        
        The requirement says on the same lan interfaces wich should be an 802.1q
        or ISL trunk connected to a switch.

        On Tue, Mar 2, 2010 at 2:25 PM, Marko Milivojevic <markom_at_ipexpert.com> wrote:

          On Tue, Mar 2, 2010 at 17:04, Santiago Enciso < santiago.enciso_at_gmail.com > wrote:

            You can try with MRV (multicast vlan registration)

          Good point, however he explicitly talked about router, not a switch. I
          doubt this feature is available on routers ;-)
          
          --
          Marko Milivojevic - CCIE #18427
          Senior Technical Instructor - IPexpert
          
          Mailto: markom_at_ipexpert.com Telephone: +1.810.326.1444
          Fax: +1.810.454.0130
          R&S Video on Demand Demo: http://bit.ly/aFyrU4

        --
        -----------------------------
        Santiago Enciso

    --
    -----------------------------
    Santiago Enciso

  Blogs and organic groups at http://www.ccie.net
  _______________________________________________________________________
  Subscription information may be found at: http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Tue Mar 02 2010 - 13:56:45 ART