The remote multicast router must support IP-in-IP DVMRP tunnel encapsulation. The remote multicast router must also be configured with a tunnel interface to the local router. The configuration parameters (Threshold, Rate Limit, Metric) at both ends of the multicast tunnel should typically be set identically, to avoid asymmetric paths.

Create new tunnel (enter destination IP address) field: Specifies the destination IP address of the multicast tunnel.
Note: You must perform similar tunnel configuration on the multicast router at the remote end of the tunnel.
Range: Valid IP address.
Apply button: Saves the parameters on the current page to the running configuration.

Threshold field: Represents the minimum IP time to live (TTL) required for a multicast datagram to be forwarded. It is used to administratively control the scope of multicast datagrams.
Note: the TTL of forwarded packets is only compared to the threshold, it is not decremented by the threshold. Every multicast router decrements the TTL by 1.
Options: Recommended values are: 1-Tunnel within a site, 32-Site boundary, 64-Regional boundary, 128-Continental boundary.
Default: 1
Rate Limit (kb/sec) field: Specifies a bandwidth limit for all multicast traffic forwarded along the tunnel. This provides a constraint on the amount of wide-area transit resources that multicast traffic can consume. The rate limit value is specified in units of kilobits per second.
Note: this feature is not supported in the current release.
Range: Units of kilobits per second (kb/sec).
Default: 0, which represents the special case of no rate limit.
Metric field: Represents the cost associated with sending a datagram on the interface. It may be used to influence the choice of routes. A less expensive interface (smaller metric) will be preferred to a more expensive interface (larger metric).

Note: metrics should be kept as small as possible; DVMRP cannot route along a path with a sum of metrics greater than 31.
Range: 1-31
Default: 1
Local Address field: Specifies the IP address of the local interface that is the multicast tunnel's source. This address must be specified and it must be an actual interface address on the local system. The remote multicast router must also be configured with a tunnel interface that specifies this address as the tunnel destination address.
Range: Valid IP address.