Ipx Datagram Structure - Lucent Technologies Cajun P220 Operation Manual

Configuring IPX Routing (Layer 3)

IPX Datagram Structure

The IPX datagram contains an IPX header and any data to be transferred on the network.
The IPX header is a 30 byte header that contains 10 fields. Figure 4-1. illustrates a
conceptual view of an IPX datagram:
Table 4-1 describes each field in the IPX datagram:
Field
Checksum
Packet Length
Transport Control
4-2
Figure 4-1. IPX Datagram in Detail
Checksum (2 bytes)
Packet Length (2 bytes)
Transport Control (1 byte)
Packet Type (1 byte)
Destination Network (4 bytes)
Destination Node (6 bytes)
Destination Socket (2 bytes)
Source Network (4 bytes)
Source Node (6 bytes)
Source Socket (2 bytes)
Table 4-1. IPX Datagram Fields
Definition
Provides integrity checking.
Note:
Checksum is normally not enabled in IPX
networks and is usually set to 0xFFFF.
Length (in bytes) of the packet.
Number of routers a packet has traversed. This is used to
discard a packet if the packet traverses a maximum number
of routers (16).
Cajun P550/P220 Switch Operation Guide
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