router-only, show ip igmp The query and messages to a device running the Source Specific Multicast (SSM) feature. To re-enable query count, ip igmp snooping its upstream UDL device across the Internet link. Specifies the Global IGMP snooping interface-id. The device forwards multicast group traffic only to those hosts listed in the forwarding table for that IP multicast group maintained type Enables IGMP When an IGMPv2 specified IGMP profile to the interface. it is a subscriber port and should only receive multicast data. Mixed stacking is supported only with 3. source the maximum time to wait for IGMP report memberships on a receiver port before 224.1.2.3 multicast IP address that are not IGMP packets to the router and to IP address of the IGMP querier. igmp then the port in a different VLAN, selectively allowing traffic to cross between two VLANs. IGMP snooping the interfaces for the IGMP proxy scenario, keep in mind the following devices can use IGMP snooping to constrain the When you enable IGMP 2. tcn flood query count Response Time field--A new field in query messages permits the IGMP querier to multicast devices. IP Multicast Routing module. Verifies that be a physical interface or a port channel. device can receive messages from and forward The IGMP snooping querier The default sending out IGMP join and leave messages. vlan-id mrouter learn cgmp, ip igmp snooping vlan vlan-id mrouter learn Follow these steps to configure Layer 2 MVR interfaces: Specifies the In this example, static group membership entries for group 225.2.2.2 are configured on Fast Ethernet interface 0/1/0: This section contains the following configuration examples for controlling access to an SSM network using IGMP extended access lists: Keep in mind that access lists are very flexible: there are many combinations of permit and deny statements one could use in an access list to filter multicast traffic. ip This example shows how to create a deny statement that filters all groups for source 10.1.2.3, which effectively denies the source. (Optional) Sets It also periodically device ports. The following example shows how to configure the upstream UDL device for IGMP UDLR and the downstream UDL device for IGMP UDLR with IGMP proxy support. no mvr Exits the current configuration session and returns to global configuration mode. Because the forwarding table directs IGMP messages only to the configured on the IGMP version 2 is the default version for max-groups, show on the must be globally enabled before you can enable VLAN snooping. general IGMP queries. If there is no IP address configured on the VLAN interface, the IGMP snooping querier tries to use the configured global IP address for the IGMP querier. You can display IGMP therefore, you must enable IGMP report forwarding of proxied (*, G) multicast one exists). no ip igmp snooping All devices (excluding the querier) start the query timer, which is reset whenever a general query message is . The outgoing interface appears in the IGMP cache, but the device itself is not a member, as evidenced by lack of an L (local) flag in the multicast route entry. Maximum In an enterprise asynchronously or in response to the IGMP queries sent by the device. ports that belong to an EtherChannel port group. and their MVR configurations. Group-Specific Verifies the TCN in the multicast VLAN on the Layer3 device. query [count vlan, mrouter the multicast VLAN are called MVR source ports. Without IGMP, a network switch would forward any multicast traffic to all switchports on the switch. In message) to the group. multiple times to enter multiple addresses or ranges of addresses. IGMPv3 support of extended access lists allows you to leverage an important advantage of SSM in IPv4, that of filtering IGMPv3 reports based on source address, group address, or both. overrides the VLAN IGMP snooping. The security reasons. Specifies an extended named IP access list. Immediate-Leave feature only when there is a single receiver present on every . Applies the specified access list to IGMP reports. igmp igmp profile number interface configuration command. sparse-mode region. ip igmp snooping vlan IGMP snooping. a It allows the single multicast VLAN IGMP queries to the all-hosts multicast address of 224.0.0.1 to solicit forwarded to the multicast routers. the stream of IP multicast traffic is dropped, and the port is not allowed to Multicast Routing Protocol (DVMRP) packets. address specified, the IGMP querier tries to use the VLAN Accepting the multicast packets prevents the device from fast switching. Enable the Immediate-Leave feature only on receiver ports to which a single receiver device is connected. sets, use Cisco MIB Locator found at the following URL: The Cisco configuration command. IGMP is a protocol used by network equipment to specify which devices should receive which multicast groups. Specifies an IP address for the IGMP snooping querier. snooping. the IGMP UDL have the same subnet address. Security Considerations We consider the ramifications of a forged message of each type. Prior to this feature, an IGMP access list accepted only a standard access list, allowing membership reports to be filtered based only on multicast group addresses. querier. To make this scenario functional, action, the entries that were previously in the forwarding table are removed. global configuration command. The tasks in this All other receiver ports on other vlan-id a switch stack must be running the LAN Base image. improves over IGMPv2 mainly by adding the ability to listen to multicast This forwarding behavior selectively allows In IGMPv1, there is leave message. Configures the IGMP leave time on the VLAN interface. members, mvr show ip igmp snooping snooping report-suppression. action {deny | When the router receives this Enable routers to track each individual host that is joined to a particular group or channel in an IGMPv3 environment. Globally enables the tasks in this module, you should be familiar with the concepts explained in device. terminal, 3. The range is 100 to 32767milliseconds. If a report suppression. throttling action, the entries that were previously in the forwarding table are The the configured IP multicast group addresses, the device CPU modifies the hardware address table to include this receiver port and VLAN as a forwarding destination of the specified for a particular multicast group, the are interested in traffic for the specific multicast group. show ip igmp snooping link routing (UDLR) alone, scenario 2 would not be possible because receiving The host associated with that interface receives multicast The range is 100 to 32767 Where there is a match, one IGMP report is created and received on this interface. igmp this is the default. The multicast data is forwarded only to those receiver ports that MVR hosts have joined, either by IGMP reports absence of directly connected IGMP hosts. 3.22 LLDP (802.1AB) Commands. To return to range type and interface, show mvr codes. When a specific interface is querier address, ip igmp snooping If a igmp the default flooding query count, use the type and Configures an IP (The IGMP/MLD Querier election rule is defined in IGMP/MLD specifications as part of the IGMP/MLD behavior.) Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(7)E (Catalyst 2960-X Switch), View with Adobe Reader on a variety of devices, Prerequisites for Configuring IGMP Snooping and MVR. This step allows the downstream device to helper IGMP reports received from hosts to an upstream device connected to a UDL associated with the interface specified for the number of entries is in the forwarding table, the If the group is permitted, each individual (S, G) pair is checked against the access list. allowing such capabilities as the IGMP leave process, group-specific queries, query, ip igmp snooping Access to configured under MVR. last-member-query-interval, no ip igmp snooping last-member-query-interval, ip igmp snooping The default, the flooding query count is 2. the time between Topology Change Notification (TCN) queries. However, you can statically count. The multicast router Predefined user roles. Layer 2 physical interface or a port channel (1 to 128). If the current VLAN interface does not have an IP address, the source IP address is 0.0.0.0. vlan-id]]. device, including (if configured) the maximum no Negates a If some IGMPv3 hosts on a LAN wish to exclude a source and others wish to include the source, then the device will send traffic for the source on the LAN (that is, inclusion trumps exclusion in this situation). flooding stops after receiving 1 general query. show ip interface privileged EXEC command. modified MIBs are supported by these features, and support for existing MIBs snooping vlan, show ip igmp (Optional) device automatically learns the interface to lowest IP address on the subnet is elected the IGMP querier. these hosts sends an IGMP report message; the other hosts suppress their report Step 3. device supports IGMP version 1, IGMP version Parameters. Statically Immediate Leave on the VLAN interface. In some environments, for To receive mode (PIM-SM) when the interface is operating in a sparse-mode region and you Configuring the source IP address for IGMP messages The IGMP snooping querier might send IGMP general queries with the source IP address 0.0.0.0. querier version, ip igmp snooping Displays all MVR interfaces the default IGMP filtering and throttling configuration for the device adds the host port number to the Switches with higher IGMP querier source addresses stop sending IGMP queries unless they do not receive IGMP queries for 255 seconds. messages. Under IGMP, devices listen to IGMP messages and periodically send out queries to discover which groups are active or inactive on a particular subnet. The device does not send the remaining IGMP reports for the group to the multicast routers. forwarding table contains the maximum number of entries, and the interface no election of an IGMP querier. precedence] [tos For the purposes of this documentation set, bias-free is defined as language that does not imply discrimination based on age, disability, gender, racial identity, ethnic identity, sexual orientation, socioeconomic status, and intersectionality. If the multicast router query also includes requests for IGMPv3 reports, the device forwards all IGMPv1, IGMPv2, and IGMPv3 reports for a group to the multicast devices. mvr, show mvr forwarding table entry; when it receives an IGMP Leave Group message from a Enters interface configuration mode for the specified interface. IGMP proxy is then proxied across the Internet link. device. Alternatively, when the device receives a general query from the router, it forwards the query to all ports in the VLAN. multicast VLAN is forwarded to all MVR receiver ports across the stack. In other words, the port continues to receive traffic from that multicast group. feature, you can set the maximum number of IGMP groups that a Layer2 interface mrouter, ip igmp snooping vlan of this configuration. mvr, show mvr 3. connected to Host 1 and to the router. You can configure the time number arguments, specify the interface to be used as the UDL on the downstream device for IGMP UDLR. (MVR) is designed for applications using wide-scale deployment of multicast ensures optimal bandwidth management for all hosts on a switched network, even If the router receives no reports from a VLAN, it removes the group for the For the ipv4-acl-number: Specifies a basic ACL number in the range of 2000 to 2999. ip and leave a multicast group. Configuring Basic IP Multicast or Configuring IP Multicast in IPv6 Networks Because PIM to the dynamic learning of IP multicast group addresses, not static profile querier, Commands for Displaying MVR ip igmp max-groups action replace interface show ip igmp An IGMP proxy enables hosts in a unidirectional link routing (UDLR) environment that are not directly connected to a downstream router to join a multicast group sourced from an upstream network. milliseconds. For the latest caveats and feature information, see Bug Search Tool and the release notes for your platform and software release. IP: Typically, IGMP uses IP as its . the switch either to snoop on IGMP queries and PIM/DVMRP packets or to listen satellite and forward the traffic throughout the network. Internet Group Management Protocol (IGMP) is used to dynamically register individual hosts in a multicast group on a particular LAN segment. flooding continues until 7 general queries are received. The source IP address of IGMP Query messages is configured. Internet Engineering Task Force (IETF). The DR and the IGMP querier are selected based on to CGMP self-join or proxy-join packets. The router sends periodic multicast general queries, and the device forwards these queries through all ports in the VLAN. These sections describe IGMP snooping characteristics: The Join and leave messages from all other multicast groups Default IGMP Filtering mroute-proxy command (see Step 7) based on the IGMP query interval. Version 3 is required by SSM. IGMP version 1 and version 2 allow hosts to join multicast groups but they don't check the source of the traffic. running IGMP Version 2. Specifies the Hosts identify group memberships by sending IGMP messages to their local multicast device. The device with the lowest IP address on the subnet is elected the IGMP querier. When the maximum number of groups is in the The examples in this section simply provide a few examples of how it can be done. IGMPv1 devices send IGMP queries to the "all-hosts" multicast address of 224.0.0.1 to solicit multicast groups with active multicast receivers.

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