Beta Draft Confidential
Configuring PNNI Routing
PNNI Reroute Load Balancing
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000 1/19/0521-21
Defining Reroute Tuning
PNNI Reroute Load Balancing uses the Reroute Tuning settings that you define on the
switch to look for alternate routing paths. The Tuning feature enables you to tune the
rate of reroute requests per switch by defining the number of reroute requests during a
single reroute batch request. You can also set the time delay (in seconds) that the
switch waits between each batch request.
Load Balancing Example
If a switch has four modules, each with 50 PVCs, and you set the reroute count to five
circuits and the reroute delay to 50 seconds, the switch performs a batch reroute
consisting of the first five circuits on each module (for a total of 20 circuits). The
switch then waits 50 seconds before it begins to reroute the next batch of 20 circuits.
Configuring Circuit Reroute Tuning Parameters
To set the tuning parameters:
1. Expand the network node to which you want to add or modify a switch.
a. To add a new switch, right-click on the Switches class node and select Add
from the pop-up menu. The Add Switch dialog box appears (Figure 21-4).
Note – When you define individual circuits, you must enable the Reroute Balance
parameter for each circuit to benefit from the tuning parameters you define for a
switch.
!
Caution – Under normal circumstances, the reroute ratio should be no greater than
one circuit (reroute count) in 10 seconds (reroute delay). A higher reroute ratio
(for example, two circuits in 10 seconds) can cause network instability, and circuits
may bounce from one PNNI link to the next indefinitely. To balance a set of circuits
after a PNNI link connection failure, use the above example to set the reroute count to
five circuits, and the reroute delay to 50 seconds.
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