Mcast -> Broadcast -> Mcast

September 17, 2006 @ 1:01 pm · Filed under CCIE Study

Thank you for the help…I’ll try. But “ip directed-broadcast” is usually used to allow directed broadcast traffic to be forworded out of that interface as regular broacast. It should not affect ingress traffic on the interface (routers always accept ingress broadcast AFAIK). Anyway, IOS works is misterious ways, you never know Sabrina
—– Original Message —- From: shha To: sabrina pittarel Cc: ccielab@groupstudy.com Sent: Sunday, September 17, 2006 8:08:26 AM Subject: Re: Q. ip multicast helper: Mcast -> Broadcast -> Mcast
Can you add ip directed-broadcast on R2 interface 3.Normally router block broadcast traffic.
On 9/16/06, sabrina pittarel wrote: Hi, I’m trying to use the multicast helper feature to convert from multicast to directed broadcast and into multicast again. Topology
Mcast transport netw Source ———- R3 —- …..—— R2 ——- Receiver 225.25.25.25 1 2 3 4
On R3 interface 1 I convert 225.25.25.25 into directed broadcast for R2 interface 3 subnet (ex 129.1.23.255) I have no problem getting this directed brodcast traffic to R2 interface 3. On R2 interface 3 I convert broadcast back into 225.25.25.25. On R2 interface 4 I’m statically joining the 225.25.25.25 group (for testing purposes). PIM Dense mode is enabled on R3 interface 1, R2 interface 4
I cannot make this working if I don’t enable pim on R2 interface 3 as well. But if I do so, R2 complains because it is receiving multicast traffic on an interface where there are no PIM neighbors and the received traffic is not sourced from the connected network:
*Sep 16 22:16:52.039: %MROUTE-3-NO_PIM_NBR: There is no PIM neighbor on this IDB: Serial1/1 -Process= “PIM Process”, ipl= 0, pid= 132
Has anyone been able to make this working without PIM on R2 interface 3?
The configureation is the following:
R3 interface 1: —————–
ip forward-protocol udp 31337
interface Serial1/2 ip address 129.1.13.3 255.255.255.0 ip pim dense-mode ip multicast helper-map 225.25.25.25 129.1.23.255 100 encapsulation ppp serial restart-delay 0
access-list 100 permit udp 129.1.17.0 0.0.0.255 host 225.25.25.25 eq 31337
R3 interface 2: —————–
interface Serial1/3 ip address 129.1.23.3 255.255.255.0 ip directed-broadcast encapsulation ppp
R2 interface 3: —————–
ip forward-protocol udp 31337
interface Serial1/1 ip address 129.1.23.2 255.255.255.0 ip pim dense-mode