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Interface Descriptors Overview
When you configure an interface, you are effectively specifying the properties for a
physical interface descriptor. In most cases, the physical interface descriptor
corresponds to a single physical device and consists of the following parts:
Each physical interface descriptor can contain one or more logical interface
descriptors. These allow you to map one or more logical (or virtual) interfaces to a
single physical device. Creating multiple logical interfaces is useful for ATM, Frame
Relay, and Gigabit Ethernet networks, in which you can associate multiple virtual
circuits, data-link connections, or virtual LANs (VLANs) with a single interface device.
Each logical interface descriptor can have one or more family descriptors to define
the protocol family that is associated with and allowed to run over the logical interface.
The following protocol families are supported:
Finally, each family descriptor can have one or more address entries, which associate
a network address with a logical interface and hence with the physical interface.
The interface name, which defines the media type
The slot in which the FPC or DPC is located
The location on the FPC in which the PIC is installed
The PIC or DPC port
The interface s channel and logical unit numbers (optional)
Internet Protocol version 4 (IPv4) suite (inet)
Internet Protocol version 6 (IPv6) suite (inet6)
Circuit cross-connect (CCC)
Translational cross-connect (TCC)
International Organization for Standardization (ISO)
Multilink Frame Relay end-to-end (MLFR end-to-end)
Multilink Frame Relay user-to-network interface network-to-network interface
(MLFR UNI NNI)
Multilink Point-to-Point Protocol (MLPPP)
Multiprotocol Label Switching (MPLS)
Trivial Network Protocol (TNP)
(M Series, T Series, and MX Series routers only) Virtual private LAN service (VPLS)
Chapter 2: Understanding Router Interfaces
Interface Descriptors Overview
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