The following sections deal with common applications that require the use of a separate virtual port on the Passport 4400:
The Passport 4400 is designed to allow all subnet traffic to be transmitted across the Passport network over a single WAN link. In order to manage the numerous SVCs carrying this traffic, each type of service is associated with a virtual port.
When an IP address is given to a virtual port, that virtual port becomes logically linked to a physical port on the Passport 4400. A single physical port can support multiple virtual ports.
Each virtual port is managed by an IfIndex. By default, the Passport 4400 is configured with two virtual ports, as shown in the following CLI display:
CLI> show fr port virtualPort operational table
| IfIndex | Mode | State | ProtocolBinding | Number |
|---|---|---|---|---|
| 2 | easyrouting | up | ip-configured | 0 |
| 4 | easyrouting | down | Unknown | 1 |
The status of the virtual port is always up when at least one virtual port is defined.
IfIndex 2, representing the virtual WAN port, is used to direct IP/IPX traffic to the WAN via the frame relay network.
IfIndex 4 represents an additional virtual port for use with IP/IPX traffic. With the use of a separate virtual port, it is possible to direct traffic to multiple subnets (IfIndex 2 for one subnet, IfIndex 4 for another). This additional virtual port is commonly used to handle network management traffic in networks that use a network management system (NMS).
The value in the Number column represents the last two digits of the DNA suffix.
It is also possible to configure additional virtual ports on the Passport 4400, allowing further control of IP/IPX traffic. See Adding a Virtual Port for more information.
Continue on to the following sections:
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