Lucent Technologies P550 - Manual (Page 98)

Configuring IPX Routing (Layer 3)
4-2 Cajun P550/P220 Switch Operation Guide
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:
Figure 4-1. IPX Datagram in Detail
Table 4-1 describes each field in the IPX datagram:
Table 4-1. IPX Datagram Fields
Field Definition
Checksum Provides integrity checking.
Note: Checksum is normally not enabled in IPX
networks and is usually set to 0xFFFF.
Packet Length Length (in bytes) of the packet.
Transport Control Number of routers a packet has traversed. This is used to
discard a packet if the packet traverses a maximum number
of routers (16).
Checksum (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)
Packet Length (2 bytes)
30 Bytes