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Cisco MGX 8850 (PXM1E/PXM45), Cisco MGX 8950, Cisco MGX 8830, and Cisco MGX 8880 Configuration Guide
Release 5.0.10, OL-3845-01 Rev. B0, August 16, 2004
Chapter 8 Managing PNNI Nodes and PNNI Routing
Managing Connection Grooming
When the grooming operation evaluates a connection for rerouting, it uses just one of the three available
metrics. The chosen metric is based on the metrics configured for the connection. You can view the
configuration of connection metrics by entering the dspcon command for the connection. Connection
metrics that display -1 are not configured. In the following example, none of the three metrics are
configured.
PXM1E_SJ.7.PXM.a > dspcon 7:2.12:12 135 135
Port Vpi Vci Owner State Persistency
----------------------------------------------------------------------------
Local 7:2.12:12 135.135 MASTER OK Persistent
Address: 47.00918100000000001a533377.000001073b0c.00
Node name: PXM1E_SJ
Remote 7:2.11:11 125.125 SLAVE OK Persistent
Address: 47.00918100000000001a533377.000001073b0b.00
Node name: PXM1E_SJ
-------------------- Provisioning Parameters --------------------
Connection Type: VCC Cast Type: Point-to-Point
Service Category: CBR Conformance: CBR.1
Bearer Class: BCOB-X
Last Fail Cause: No Fail Attempts: 0
Continuity Check: Disabled Frame Discard: Disabled
L-Utils: 100 R-Utils: 100 Max Cost: -1 Routing Cost: 0 (N/A)
OAM Segment Ep: Enabled
Pref Rte Id: 0 Directed Route: No
Priority: 8 Num Parties: -
---------- Traffic Parameters ----------
Values: Configured (Signalled)
Type <CR> to continue, Q<CR> to stop:
Tx PCR: 50 (50 ) Rx PCR: 50 (50 )
Tx CDVT: 250000 (250000 )
Tx CDV: -1 (-1 ) Rx CDV: -1 (-1 )
Tx CTD: -1 (-1 ) Rx CTD: -1 (-1 )
-------------------- Preferred Route Parameters------------------
Currently on preferred route: N/A
-------------------- Others -------------------------------------
SM: Record Number: 2, ATM
-------------------- Soft Reroute Parameters------------------
Negotiated Slave Soft Reroute Capability: DISABLE
Soft Reroute Last Cause: N/A. Soft Reroute is not performed yet.
In the example above, the transmit and receive values for CDV and CTD are -1. Also the Max Cost value
is set to -1. The Max Cost of a connection is defined during connection configuration and specifies the
maximum permissible sum of the administrative weight (AW) on each line along that connection.
The default configuration uses the AW metric for connection grooming. However, you can use the
cnfcon command to configure a connection to use maximum cost, CTD, or CDV metrics. If only one of
the metrics is configured, that metric is evaluated. If multiple metrics are configured, the metric with the
highest priority is evaluated. The highest priority is AW, which is selected whenever a maximum cost is
configured. The second highest priority is CTD, and the lowest priority is CDV. Table 8-13 shows how
metrics are chosen based on the connection configuration.
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