Specifications

6-8
Cisco MGX 8850 (PXM45) and MGX 8950 Software Configuration Guide
Release 3, Part Number 78-14788-01 Rev. C0, January 2004
Chapter 6 Managing PNNI Nodes and PNNI Routing
Managing PNNI Route and Link Selection
Managing PNNI Route and Link Selection
The following sections describe how to control route and link selection for the links on each PNNI node.
Configuring the Route Selection Method (First Fit or Best Fit)
When the PNNI controller searches for routes, it can choose the first route that meets the call
requirements, or it can choose the route that provides the best performance. The first fit method chooses
the first available route and reduces call processing time. The best fit method chooses the optimum route,
but it takes longer to select the route. The default setting is first fit.
Note The route selection process is described in the Cisco MGX and SES PNNI Network Planning Guide.
Table 6-4 Parameters for cnfpnni-timer Command
Parameter Description
node-index Logical node’s node index.
-ptseholddown The number is used as a multiplier of the Hello interval of the peer
neighbor: the product is the maximum time that the neighbor is
considered to be alive without the reception of its Hello packets.
Range: (0.1–10) second
Default = 1
-helloholddown Value for the Hello hold down timer that limits the rate at which it sends
Hellos.
-hellointerval Initial value for the Hello timer.
-helloinactivityfactor Inactivity time factor on a horizontal link between two logical nodes.
-ptserefreshinterval Time allowed for the PTSE to re-originate.
-ptselifetimefactor Value for the lifetime multiplier, expressed as a percentage. The product
of ptselifetimefactor and the ptserefreshinterval sets the remaining
lifetime of a self-originated PTSE.
-retransmitinterval Period between retransmissions of unacknowledged DS, PTSE request,
and PTSP.
-ptsedelayedackinterval Minimum time allowed between transmissions of delayed PTSE
acknowledgment packets.
-avcrpm Proportional multiplier used in the algorithms that determines significant
change for AvCR parameters.
-avcrmt Minimum threshold used in the algorithms that determine significant
change for AvCR parameters.
-cdvpm Proportional multiplier used in the algorithms that determine significant
change for CDV parameters.
-ctdpm Proportional multiplier used in the algorithms that determine significant
change for CTD parameters.