Compatible Systems 5.4 manual Network Number per Frame Type, RIP Update Timer, SAP Update Timer

Chapter 3 - IPX Routing & Bridging 59

if it exists. If it doesn’t discover a number in use, the device will wait indefinitely until a number is set by another router on the segment.

•Auto-Seedmeans the device will listen for an IPX network number being set by another router (including Novell software routers residing on servers) on the segment connected to this interface and use this number if it exists. If it doesn’t discover a number in use, the device will auto-generate a valid number using its routing tables.

•Off means the device will neither listen for, nor send packets with this frame type on this interface.

>Network Number (per Frame Type)

This is an eight-digit hexadecimal number that uniquely identifies the network segment connected to this interface. Values range from 1 to

FFFFFFFE.

ϖ Note: Accidental selection of an IPX network number which is already in use on another network segment may cause hard-to-diagnose problems. You should carefully track which IPX network numbers are in use, and where they are used.

RIP Update Timer

This value dictates how often the device sends out IPX RIP (Routing Infor- mation Protocol) packets on the network segment attached to this interface. The RIP packets sent out on this interface contain information about networks for which this device is responsible. RIP packets received tell the device about other networks and routers. The default is 60 seconds.

SAP Update Timer

This value dictates how often the device sends out IPX SAP (Service Access Protocol) packets on the network segment attached to this interface. The SAP packets sent out on this interface contain information about services (such as servers, printers, etc.) for which this device is responsible. SAP packets received tell this device about services available on other network segments. The default is 60 seconds.

Block IPX Type 20 Output Packets

In order for some protocols, notably NetBIOS, to function in the NetWare environment, routers must propagate a certain type of broadcast packet throughout an IPX internetwork. IPX packet type 20 is designated to perform broadcast propagation for these protocols.

When an IPX device receives a type 20 packet, it rebroadcasts it out all inter- faces, except the one on which it was received. The IPX network number of the originating interface is included in the rebroadcast packets.