Re: multicast helper-map, connecting 2 broadcast network

check out the end of your ip helper-map broadcast and do a ?

Hint: hop count

On Fri, Mar 30, 2012 at 1:35 AM, ccie99999 <ccie99999_at_googlemail.com> wrote:

> hello GS guys..
>
> I'm following this guide for doing a small lab regarding the use of a
> multicast helper for connecting 2 broadcast networks..
>
> I'm reading this:
>
>
> http://www.cisco.com/en/US/docs/ios-xml/ios/ipmulti_igmp/configuration/12-4t/imc_interm_mc_helper.html
>
> I'm sure I've already done this lab times ago and it was working.. I'm
> pretty sure I was using IOU at that time and now it's not working, nor with
> IOU nor with dynamips.
>
> the lab is small:
>
> R1 - R2 - R3 - R4 - R5
>
> from R2 to R4 it's a multicast enabled network and on R1 and R5 I've enable
> Rip v2.
>
> I've setup everything like it should be:
>
> ################
> R1: rip enabled (v2) and on interface between R1 and R2 I've put ip rip
> v2-broadcast
> ################
> R5: rip enabled (v2)
> ################
> R2: I've setup an helper-map like this one: ip multicast helper-map
> broadcast 224.1.1.1 100
> R2: I've setup an acl like this one: access-list 100 permit udp host
> 10.1.12.1 eq rip host 255.255.255.255 eq rip log
> R2: enabled this: ip forward-protocol udp rip
> ################
> R4: I've setup and helper-map that take the traffic from 224.1.1.1 and send
> to broadcast address of network between R4 and R5 if that matches acl 100
> ip multicast helper-map 224.1.1.1 10.1.45.255 100
> R4: acl 100 of course: access-list 100 permit udp host 10.1.12.1 any eq rip
> log
> R4: enabled this: ip forward-protocol udp rip
> ################
>
> multicast-routing is enabled on R2,R3,R4 and R2 is the bsr candidate and MA
> for the network.
> on R3 and R4 I can see the rp mapping.
>
> ospf is enabled on R2,R3,R4
>
> everything looks fine (to me) but it doesn't work.
>
> If I do a capture I see the broadcast traffic coming from R1, matching the
> access-list 100 and then stop.
> Despite this on R3 and R4 I see the mroute 224.1.1.1
>
> If I do a capture on R4 I don't get any traffic matching the acl 100.
>
> I've checked and re-checked the configuration guide (the link above) and I
> don't understand what I miss.
>
> Looks like the R2 is not able to convert the traffic from broadcast to
> multicast and therefore the traffic is not reaching R4.
>
> anyone see an error in what I've done?
>
> tnx in advance
>
> --
> ccie99999
>
>
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-- 
Dennis Worth
Blogs and organic groups at http://www.ccie.net