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ISDN Connection Management
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IPX Specifics
RIP/IPX and SAP/IPX
ISDN routers incorporate a 3 second settling time for IPX RIP and SAP updates. This means that an router
will wait for three seconds after an initial change in the network is reported before transmitting that change on
to the remaining routers connected on the Wide Area Network.
Suspension of IPX Sessions
When Connection Management is enabled, IPX sessions that are established across the ISDN calls are
monitored and maintained in a table. The IPX connection table may contain up to 256 entries. The router will
filter all watchdog traffic for any IPX session over the 256 limit of the table preventing any new IPX sessions
from being established.
Server IPX Watchdog Frames
When the router on the server side of the IPX session receives an IPX watchdog packet from the server on
the local LAN, the router will pass the watchdog packet to the remote partner router and then to the client
side of the IPX session. Once the client side of the session has responded to the IPX watchdog, the router
on the server side of the IPX session will consider all future IPX watchdog packets for this session to be
non-interesting and will not pass them across the ISDN call.
The router on the server side of the IPX session will generate a response to each IPX watchdog packet sent
by the server and send the response back to the server on the local LAN. In this way, the local router will
keep the ISDN call suspended and will also keep the local side of the IPX session active.
While an ISDN call is suspended, if the router on the server side of the IPX session observes that the server
has stopped generating IPX watchdog packets, the router will assume that the server has gone away and alert
the router on the client side of the IPX session. The router on the client side of the IPX session will stop
generating IPX watchdog packets for that IPX session.
Client IPX Watchdog Frames
When the router on the client side of the IPX session observes an IPX watchdog packet from the server side
of the IPX session sent to the client, and later an IPX watchdog reply being sent from the client back to the
server, the router on the client side of the IPX session will begin to generate and send IPX watchdog
packets to the client on behalf of the server.
While an ISDN call is suspended, if the router on the client side of the IPX session observes that the client
has stopped responding to the IPX watchdog packets, the router will assume that the client has gone away
and will alert the router on the server side of the IPX session. The router on the server side of the IPX
session will stop responding to the IPX watchdog packets for that IPX session and will filter all remaining
IPX watchdog packets generated by the server until the server has determined that the client has gone away.
The time interval between the IPX watchdog packets generated by the router on the client side of the IPX
session may be defined by the operator by setting the Watchdog Interval option in the IPX Routing Set-Up
menu.
IPX Serialization Frames
The router will prevent IPX serialization frames from activating a suspended ISDN call by filtering the IPX
serialization frames. The router will allow IPX serialization frames to be passed to the WAN when the ISDN
call is active.