Re: multicast helper-map, connecting 2 broadcast network

Can you post full configs? ( for R2 and R4 )

-Yuri

On Sat, Mar 31, 2012 at 1:29 AM, ccie99999 <ccie99999_at_googlemail.com> wrote:

> thanks Dennis..
>
> you've pointed out probably the right point.
>
> anyway I've already tried to setup a ttl of 3 (that should be enough) but
> nothing. I've also tried an higher number but still nothing :(
>
> R1 - R2 - R3 - R4 - R5
>
> on R2 if I debug the acl 100 I see this:
>
> *Mar 1 01:01:42.663: IP: s=10.1.12.1 (FastEthernet0/0), d=255.255.255.255,
> len 52, rcvd 2
> *Mar 1 01:01:42.667: UDP src=520, dst=520
> R2#
> *Mar 1 01:02:05.111: %SEC-6-IPACCESSLOGP: list 100 permitted udp
> 10.1.12.1(520) -> 255.255.255.255(520), 9 packets
>
> I should now expect the broadcast traffic becomes multicast with
> "destination?" 224.1.1.1.
>
> Unluckily I don't see the join in R2 to group 224.1.1.1:
>
> (the helper map was: ip multicast helper-map broadcast 224.1.1.1 100 ttl
> 5)
>
> R2#show ip mroute 224.1.1.1
>
> (*, 224.1.1.1), 01:02:09/00:03:27, RP 2.2.2.2, flags: S
> Incoming interface: Null, RPF nbr 0.0.0.0
> Outgoing interface list:
> Serial0/0.23, Forward/Sparse, 01:02:09/00:03:27
>
> and I do a generic "debug ip packet detail" on R3 I don't get any traffic
> regarding 224.1.1.1
>
> to me it looks like the helper-map is not converting from broadcast to
> multicast..
>
> I don't understand why :(
>
>
>
>
>
>
>
>
>
>
>
> On Fri, Mar 30, 2012 at 4:15 PM, Dennis Worth <dennis.worth_at_gmail.com
> >wrote:
>
> > 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
> >>
> >>
> >> Blogs and organic groups at http://www.ccie.net
> >>
> >> _______________________________________________________________________
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> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >>
> >
> >
> > --
> > Dennis Worth
> >
> >
> >
> >
>
>
> --
> ccie99999
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
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Received on Sun Apr 01 2012 - 10:49:36 ART