Cabletron Systems CSX1000, CSX1200 IPX-SPECIFIC Information for Devices, Configuring IPX Devices

USER’S GUIDE

OVER-SUBSCRIPTION TIMER

Over subscription is the situation in which there are more next-hop routers on the WAN that need updates than there are channels available. When a WAN circuit goes down, a delay (per the over- subscription timer) is incorporated in marking the routes unreachable. This allows the calls to time- multiplex over the limited channels. Valid range for timer: 1 to 10,000 seconds; default: 180 seconds.

TRIGGERED RIP/SAP BACKGROUND INFORMATION

When there are a large number of remote destinations, the manual configuration of static routes and services over WAN circuits can pose a burden on system management. Yet running RIP/SAP could also be problematic; since these are broadcast protocols, periodic broadcasts may not be feasible due to cost and bandwidth considerations. Enabling the Triggered RIP/SAP feature allows the CyberSWITCH to send information on the WAN only when there has been an update to the database or a change in the reachability of a next-hop router.

Specifically, triggered RIP and SAP updates are only transmitted on the WAN:

•when a specific request for a routing/service update has been received;

•when the routing or service databases are modified by new information from another interface (in which case, only the latest changes are sent);

•when a destination has changed from an unreachable to a reachable state; and

•when the unit is powered up.

You may customize triggered RIP/SAP operation to your system’s specific needs through the global timers. The global timers are user-controlled; they are described in detail in the Configuration Elements section (page 291), and include the following:

•database timer

•hold-down timer

•retransmission timer

•polling timer

•over-subscription timer

IPX-SPECIFIC INFORMATION FOR DEVICES

Note: The Configuring Device Level Databases chapter contains general information needed to configure on-node device entries. The following sections provide instructions for entering on-node device information specific to IPX routing and/or bridging using the IPX Remote LAN interface.

CONFIGURING IPX DEVICES

WAN DEVICES

USING CFGEDIT

1.Select Security from the main menu.

2.Select Device Level Databases from the security menu.

3.Select On-node Device Entries from the authentication database menu.

292 CyberSWITCH