McDewey

TTL Threshold is too low so IP Multicast Traffic does not Reach the Receiver Diagnose the Problem In the previous figure, the Receiver does not receive multicast packets from the Source. There can be several routers between the source and Router 75a. First look at Router 75a, since it is directly connected to the Receiver.

<#root> ip22-75a# show ip mroute 224.1.1.1

IP Multicast Routing Table Flags: D - Dense, S - Sparse, C - Connected, L - Local, P - Pruned R - RP-bit set, F - Register flag, T - SPT-bit set, J - Join SPT M - MSDP created entry, X - Proxy Join Timer Running A - Advertised via MSDP Timers: Uptime/Expires Interface state: Interface, Next-Hop or VCD, State/Mode

(*, 224.1.1.1), 00:32:05/00:02:59, RP 0.0.0.0, flags: DJC Incoming interface: Null, RPF nbr 0.0.0.0 Outgoing interface list: Ethernet0/1, Forward/Sparse-Dense, 00:08:17/00:00:00

(10.1.1.1, 224.1.1.1), 00:01:02/00:01:57, flags: CTA Incoming interface: Ethernet0/0, RPF nbr 0.0.0.0 Outgoing interface list: Ethernet0/1, Forward/Sparse-Dense, 00:01:02/00:00:00

The output shows Router 75a forwards packets out Ethernet0/1. In order to be absolutely sure Router 75a forwards the packets, turn on debug just for this source and multicast group: