How to troubleshoot IP multicast with static mroute?
This static mroute states that to get to the address 1.1.1.1 for RPF, use 2.1.1.1 as the next hop which is out interface E3/1. The output of show ip mroute and debug ip mpacket looks good, the number of sent packets in the show ip mroute count increases, and HostA receives packets.
What to do when multicast does not work in same VLAN?
When a network/VLAN does not have a router that can take on the multicast router role and provide the mrouter discovery on the switches, you can turn on the IGMP querier feature. The feature allows the Layer 2 switch to proxy for a multicast router and send out periodic IGMP queries in that network.
Why does my router not receive multicast packets?
In the previous figure, the Receiver does not receive multicast packets from the Source. There might be several routers between the source and Router 75a. First look at Router 75a, since it is directly connected to the Receiver. The output shows Router 75a forwards packets out Ethernet0/1.
What is the MAC address for multicast traffic?
Any IP version 4 (IPv4) traffic with a destination IP in the range of 224.0.0.0 to 239.255.255.255 is a multicast stream. All IPv4 multicast packets map to a predefined IEEE MAC address that has the format 01.00.5e. xx. xx. xx. Note: IGMP snooping works only if the multicast MAC address maps to this IEEE-compliant MAC range.
How to troubleshoot Cisco multicast with netstat?
Check the interface counters on the host. First, check the interface counters (if you are on a UNIX system, use the netstat command) on the source host to see if it is sending packets. If it is not, check for misconfiguration or bugs in the host stack and application.
What does reverse path forwarding do in multicast?
Multicast has a concept of Reverse Path Forwarding (RPF) check. When a multicast packet arrives on an interface, the RPF process checks to ensure that this incoming interface is the outgoing interface used by unicast routing in order to reach the source of the multicast packet. This RPF check process prevents loops.
Where do the multicast packets come from in Cisco?
This entry tells you that the multicast packets are sourced from a server whose address is 1.1.1.1, which sends to a multicast group of 224.1.1.1. The packets come into the Ethernet0/0 interface and are forwarded out the Ethernet0/1 interface. This is a perfect scenario.