3Com Switch 7700 Configuration Manual page 85

Configuring the Update Interval of IPX SAP In a huge network, one IPX SAP
broadcast consumes enormous bandwidth resources. By configuring an
appropriate SAP update interval, you can reduce the bandwidth waste.
Perform the following configuration in system view.
Table 28 Configuring the Update Interval of IPX SAP
Operation
Configure the update interval of IPX SAP
Restore the default update interval of IPX SAP undo ipx sap timer update
By default, IPX SAP sends updates every 60 seconds.
Ensure that all servers and switches on the network have the same SAP update
interval to avoid a situation in which the switches mistake an operating server for a
failed one.
Configuring the Aging Period of IPX SAP The aging period of IPX SAP is a
multiple of the IPX SAP update interval. With the following command, you can set
the multiplier.
Perform the following configuration in system view.
Table 29 Configuring the Aging Period of IPX SAP
Operation
Configure the aging period of IPX SAP
Restore the default aging period
By default, an IPX SAP service entry is deleted if it is not updated after three
update intervals.
Configuring the Size of IPX SAP Update Packets Perform the following
configuration in VLAN interface view.
Table 30 Configuring the Size of IPX SAP Update Packets
Operation
Configure the size of IPX SAP update packets
Restore the default setting
By default, the maximum size of an IPX SAP update packet is 480 bytes.
Considering the 32 bytes for the headers, each SAP update packet can carry up to
seven sets of 64-byte server information.
Configuring the GNS Reply of IPX SAP Get Nearest Server (GNS) is a type of
SAP message that is broadcast by SAP-enabled NetWare clients. To the GNS
requests, NetWare servers respond with Give Nearest Server messages.
If a NetWare server is available on the network segment to which the client is
connected, the server responds to its request. If no NetWare server is available on
the segment, the switch responds.
You can have the switch handle a SAP GNS request in one of the following ways:
IPX Configuration
Command
ipx sap timer update seconds
Command
ipx sap multiplier multiplier
undo ipx sap multiplier
Command
ipx sap mtu bytes
undo ipx sap mtu
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