ip multicast dvmrp tunnels define 511

ip multicast dvmrp tunnels define

3500

9000

9400

3900

9300

For CoreBuilder 9000: Applies to Layer 3 switching modules only.

Defines one end point of a DVMRP tunnel. The other tunnel end point lies on an IP multicast routing interface on a different system and subnetwork. One or more unicast routers lie between these tunnel end points.

Valid Minimum Abbreviation

ip m d t d

Important Considerations

IP multicast tunnels are not required in all networks. Configure a tunnel only if you need to have IP multicast traffic forwarded through one or more routers that do not understand IP multicast protocols and would therefore filter IP multicast packets. Because IP multicast packets are encapsulated in unicast format at the tunnel entrance point, the interim routers in the tunnel forward the packets onward toward the other tunnel exit point.

Think of an IP multicast tunnel end point as being layered on top of a regular DVMRP routing interface. Therefore, before you can define a multicast tunnel end point in your system, you must first define at least one IP virtual LAN (VLAN), define at least one IP interface, and enable DVMRP on the interface.

The remote tunnel end point must lie on a different system and subnetwork.

You must define the tunnel on both end points — that is, on both the local system and the remote system — even though you specify the address of the remote interface in the local system.

When you define a tunnel with local and remote addresses, the system automatically assigns the value 1 as both the tunnel metric and the tunnel TTL threshold, as shown in the IP multicast DVMRP tunnel summary display. You can change these values through menu options.

IP multicast interfaces and tunnels have similar characteristics, such as TTL threshold and metric. The characteristics of a tunnel do not have to match the characteristics of the interface on which it is configured.

You can define multiple tunnel end points on the same local routing interface in your system, but these tunnels must lead to different remote routing interfaces.

Page 511
Image 511
3Com 3500 manual Ip multicast dvmrp tunnels define