Frame Relay Address Mapping
Frame Relay Address Mapping refers to the mapping of a Frame Relay connection between a Data Link Connection Identifier (DLCI) and an IP address.
In a Frame Relay network, the DLCI is a unique identifier that identifies the virtual circuit between two Frame Relay devices. The DLCI is assigned by the service provider and is used to identify the connection between the two devices. On the other hand, the IP address is a logical address assigned to the end device.
To map the DLCI to the IP address, Frame Relay devices use one of two methods: static mapping or dynamic mapping.
In static mapping, the Frame Relay DLCI is statically assigned to an IP address. This means that the mapping is manually configured on each Frame Relay device. Static mapping is typically used in small Frame Relay networks where there are only a few connections.
In dynamic mapping, the Frame Relay DLCI is dynamically assigned to an IP address. This is achieved using a protocol called Inverse Address Resolution Protocol (IARP). With IARP, the Frame Relay device sends a broadcast message requesting the IP address of the remote device. The remote device responds with its IP address, and the local device maps the DLCI to the IP address. Dynamic mapping is commonly used in larger Frame Relay networks where there are multiple connections that need to be established and torn down dynamically.
Once the mapping is established, the Frame Relay device can forward frames from one end device to another based on the DLCI.
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