Event ID 41046 — RRAS IGMP Configuration

Applies To: Windows Server 2008 R2

To support Internet Protocol version 4 (IPv4) multicast applications on a single-router intranet or when connecting a single-router intranet to the Internet, you can use the Routing and Remote Access service, add the IGMP routing protocol on each server, and configure the server's outbound interface for IGMP router mode and its inbound interface for IGMP proxy mode. If your multicast applications cross the Internet, the outbound interface is the intranet interface and the inbound interface is the Internet interface.

Event Details

Resolve

Check the interface is not added to IGMP

Check if this interface is added to IGMP. If necessary, delete the interface from IGMP.

To perform this procedure, you must have membership in Administrators, or you must have been delegated the appropriate authority.

To delete the IGMP interface:

1. Open Routing and Remote Access. Click Start, click Run, type rrasmgmt.msc, and then press ENTER.
2. In the console tree, expand IPv4, and then click IGMP.
3. In the details pane, right-click the interface you want to configure, and then click Delete.
4. Click Yes in the confirmation dialog box.

Verify

You can verify multicast routing configuration with the mrinfo command. You can use the configuration information to aid in the troubleshooting of multicast forwarding and routing problems.

The mrinfo command queries a specified multicast router with an Internet Group Management Protocol (IGMP) message. The response to the query contains a version number, the list of interfaces and the neighbors on each interface, metrics, Time to Live (TTL) thresholds, and flags. The syntax of the mrinfo command is:

mrinfo [-n] [ -i address ] [ -r retry_count ] [ -t timeout_count ] multicast_router

• The -n option displays IP addresses in numeric format.
• The -i option specifies the IP address of the interface from which you want to send the mrinfo query. By default, the interface from which to send the mrinfo query is determined by the IP routing table.
• The -r option specifies the neighbor query retry limit. The default value is 3.
• The -t option specifies how long, in seconds, mrinfo waits for a neighbor query reply. The default value is 4.

The following is an example of the mrinfo command:

C:\>mrinfo 10.1.0.1

10.1.0.1(test1.microsoft.com) [version 18.55,mtrace,snmp]:

10.1.0.1 -> 0.0.0.0 (local) [1/0/querier/leaf]

10.2.0.1 -> 10.2.0.2 (test2.microsoft.com) [1/0]

10.2.0.1 -> 10.2.0.3 (test3.microsoft.com) [1/0]

10.3.0.1 -> 0.0.0.0 (local) [1/0/querier/leaf]

In the preceding example, mrinfo is run against the multicast router at 10.1.0.1. The first line shows the multicast router configuration: version number (for servers running Routing and Remote Access, the version number reflects the build number of the operating system) and flags (mtrace and snmp supported).

Each additional line displays the interfaces on the multicast router and the neighbors on each interface. Interfaces 10.1.0.1 and 10.3.0.1 have no neighbors. Interface 10.2.0.1 has two neighbors, 10.2.0.2 and 10.2.0.3. For each line, mrinfo displays the interface and neighbor, the domain name for the neighbor, the multicast routing metric, the TTL threshold, and flags indicating its role on the network, such as the IGMP querier of the network (querier) or whether it has no neighbors (leaf).

Related Management Information

RRAS IGMP Configuration

Routing and Remote Access Service Infrastructure