Support for Multicast Router Information

When you enable multicast routing on a virtual router, the router acts as a multicast router information (mrinfo) server. This feature enables the router to respond to mrinfo requests from other network hosts. Specifically, E-series virtual routers respond to DVMRP ask neighbors and DVMRP ask neighbors2 requests.

Each virtual router responds to mrinfo requests with a list of multicast interfaces and their IP addresses. If appropriate, the virtual router also supplies the following information for each interface:

• Current functional status of the interface (for example, if the interface is down).
• Information as to whether the interface is disabled and the reason for the interface being disabled—either because IP is not configured on the interface or because the interface has been disabled through the software.
• Whether the interface is performing the IGMP queries for this subnet.
• Information about PIM neighbors:

  If PIM is configured on the interface, the virtual router supplies a list of the interface's PIM neighbors and indicates which neighbors are leaf neighbors.

• Information about DVMRP and GRE tunnels:

  If the interface is an endpoint of a tunnel, the virtual router specifies the IP address of the endpoint of the tunnel.

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