Solved Multicast 2 Cisco Community Overview multicast is beneficial for networks when implemented correctly, but the underlying protocols that allow for proper multicast forwarding are not always well understood. this article will first shed light on igmp (rfc 1112) and then discuss how to troubleshoot reported l2 multicast problems. Igmp (internet group management protocol) is a host router multicast signalling protocol that provides dynamically registration of the hosts to the desired multicast groups.
Cisco Nexus 3550 T Nx Os Multicast Routing Configuration Guide Release Both igmpv1 and igmpv2 are suitable for any source multicast where a station is interested in receiving all transmissions to a multicast group, regardless of who is the sender. In this chapter from ip multicast, volume i: cisco ip multicast networking, authors josh loveless, ray blair, and arvind durai take an in depth look at ip multicast messages at layer 2 and how they are transported in a layer 2 domain. When ssm mapping is configured, if a router receives an igmpv1 or igmpv2 membership report for a particular group g, the router translates this report into one or more (s, g) channel memberships for the well known sources associated with this group. Using optional configurations, reduces the traffic impact on upstream ip multicast routers by suppressing igmp membership reports (igmpv2) or by acting as an igmp proxy reporter (igmpv3) to the upstream ip multicast router.
Cisco Nexus 3548 Switch Nx Os Multicast Routing Configuration Guide When ssm mapping is configured, if a router receives an igmpv1 or igmpv2 membership report for a particular group g, the router translates this report into one or more (s, g) channel memberships for the well known sources associated with this group. Using optional configurations, reduces the traffic impact on upstream ip multicast routers by suppressing igmp membership reports (igmpv2) or by acting as an igmp proxy reporter (igmpv3) to the upstream ip multicast router. Rfc 2236 defines igmpv2. provides for source filtering, which enables a multicast receiver host to signal to a device which groups it wants to receive multicast traffic from, and from which sources this traffic is expected. Layer 2 can use igmp snooping to constrain the flooding of multicast traffic by dynamically configuring layer 2 interfaces so that multicast traffic is forwarded to only those interfaces associated with ip multicast devices. Igmpv2 also enhances igmp by providing support for the following capabilities: querier election process provides the capability for igmpv2 devices to elect the igmp querier without having to rely on the multicast routing protocol to perform the process.".
Cisco Nexus 9000 Series Nx Os Multicast Routing Configuration Guide Rfc 2236 defines igmpv2. provides for source filtering, which enables a multicast receiver host to signal to a device which groups it wants to receive multicast traffic from, and from which sources this traffic is expected. Layer 2 can use igmp snooping to constrain the flooding of multicast traffic by dynamically configuring layer 2 interfaces so that multicast traffic is forwarded to only those interfaces associated with ip multicast devices. Igmpv2 also enhances igmp by providing support for the following capabilities: querier election process provides the capability for igmpv2 devices to elect the igmp querier without having to rely on the multicast routing protocol to perform the process.".
Comments are closed.