Specifications

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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
Configuring Link Selection for Parallel Links
When parallel links exist between two nodes on a route, the node closest to the originating node selects
a link based on one of the following parameters:
• The lowest Administrative Weight (minaw)
• The maximum available cell rate (maxavcr)
• The maximum cell rate configured for the link (maxcr)
• Random link selection (loadbalance)
Note The route selection process is described in the Cisco MGX and SES PNNI Network Planning Guide.
To configure the link selection method, enter the cnfpnni-link-selection command as follows:
8850_LA.7.PXM.a > cnfpnni-link-selection pnportid minaw|maxavcr|maxcr|loadbalance
Replace pnportid with the port ID in the format slot[:subslot].port[:subport]. (This is the same format
that appears when you display ports with the dsppnport command.) Enter one link selection method after
the port ID.
To display the link selection method, enter the dsppnni-link-selection command as follows:
8850_LA.7.PXM.a > dsppnni-link-selection 1:2.1:1
physical port id: 1:2.1:1 link selection: minaw
logical port id: 16848897
Configuring the Maximum Bandwidth for a Link
The maximum bandwidth for a link is defined when a PNNI partition is configured for a port. For more
information, see Chapter 6, “Provisioning AXSM Communication Links.”
Configuring the Administrative Weight
The link administrative weight (AW) is used to calculate the total cost of a route and can be used by the
PNNI controller when it has to choose between multiple parallel links. You can assign different AW
values for each ATM class of service.
Note The role of AW in route and link selection is described in more detail in the Cisco MGX and SES PNNI
Network Planning Guide.
To configure the AW for a link, enter the cnfpnni-intf command as follows:
8850_LA.7.PXM.a > cnfpnni-intf <pnportid> [-awcbr] [-awrtvbr] [-awnrtvbr] [-awabr]
[-awubr] [-awal]