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A virtual router interface corresponds to routing on a virtual port that is associated with a VLAN. This type of routing is the routing of IP traffic to and from a VLAN. Because a given port can belong to multiple VLANs (some of which are configured for routing on the switch and some of which are not), there is no longer a one-to-one correspondence between the physical port and the router interface. For VLAN routing, the router interface for the VLAN is called a virtual router interface because the IP address is assigned to an interface on the routing entity in the switch. This initial interface has a one-to-one correspondence with a VLAN on any given switch.
In a Passport 1000 Series switch, for IP-based network management (SNMP, Telnet, and Web), you can use the IP address of any physical or virtual router interface.
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