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What layer is multicast on?
link layer
Multicast addressing can be used in the link layer (layer 2 in the OSI model), such as Ethernet multicast, and at the internet layer (layer 3 for OSI) for Internet Protocol Version 4 (IPv4) or Version 6 (IPv6) multicast.
How do you test if multicast is working?
In order to verify if Multicast is working correctly in your network, you can use the following quick tcpdump/ping test. If the Multicast is working correctly then you should see packets arriving at the first node. Repeat this procedure in each node to verify that Multicast is OK in your network.
Why are multicast packets lost during network transmission?
There are several reasons of the multicast packets losses. The UDP protocol itself trades reliability of performance and does not guarantee the datagrams delivery. Therefore, the packet could be lost during the network transmission.
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.
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.
Why are packet drops dropped in Layer3 unicast?
A layer3 unicast IPV4/IPV6 frame does not have the destination mac address of the router, or any mac address defined in the VRRP table. These are dropped. With RPF enabled, an ingress IPV4 frame has a source IP address that is not permitted, or not permitted on the ingress interface – these are dropped.