Cabletron Systems CSX1000 - Manual (Page 292)

USER’S GUIDE
292 CyberSWITCH
O VER - SUBSCRIPTION T IMER
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.
T RIGGERED RIP/SAP B ACKGROUND I NFORMATION
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-S PECIFIC I NFORMATION FOR D EVICES
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.
C ONFIGURING IPX D EVICES
WAN D EVICES
U SING 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.