Cisco Systems Cisco MGX 8850 Manuale Utente
8-8
Cisco MGX 8850 Routing Switch Command Reference
Release 2.0, Part Number 78-10467-04 Rev C0, October 2001
Chapter 8
Network Optimization Commands
cnfrteopt
cnfrteopt
Configure Route Optimization
Configure periodic route optimization to improve bandwidth utilization. This type of optimization is a
type of connection grooming. To automate route optimization, cnfrteopt lets you specify an interval
between new optimization cycles—every 2 hours, for example. (To force immediate route optimization,
use the optrte command.)
type of connection grooming. To automate route optimization, cnfrteopt lets you specify an interval
between new optimization cycles—every 2 hours, for example. (To force immediate route optimization,
use the optrte command.)
You can choose a time period for optimization so that disruption is minimal. For example, you could
specify that the switch starts grooming a range of SPVCs for one hour at midnight. Note, however, that
route optimization is a background process and does not attempt to optimize all possible connections at
once. The load created by route optimization is extremely small and cannot cause congestion.
specify that the switch starts grooming a range of SPVCs for one hour at midnight. Note, however, that
route optimization is a background process and does not attempt to optimize all possible connections at
once. The load created by route optimization is extremely small and cannot cause congestion.
The nature of SPVCs provides a reason for periodic grooming: during the course of daily operation,
better routes may become available. The determining factor for a better route is the maximum cost
(maxcost). See the addcon description for details about the maxcost parameter. The PNNI protocol
identifies this maximum cost by another name: administrative weight (AW).
better routes may become available. The determining factor for a better route is the maximum cost
(maxcost). See the addcon description for details about the maxcost parameter. The PNNI protocol
identifies this maximum cost by another name: administrative weight (AW).
Note
If you do not specify a maxcost with either the addcon or cnfcon command, the routing protocol uses
the AW on only forward links to calculate a new route for the connection. If the connection has a
specified maxcost, the routing protocol calculates possible routes by using the AW in both directions.
the AW on only forward links to calculate a new route for the connection. If the connection has a
specified maxcost, the routing protocol calculates possible routes by using the AW in both directions.
Usage Guidelines
Note the following characteristics of route optimization:
•
Within a range of connections, the cnfrteopt command applies to only the master endpoints. The
slave endpoints are not processed by cnfrteopt.
slave endpoints are not processed by cnfrteopt.
•
Route optimization applies to only routed connections. The switching fabric does load comparison
between the routing cost of a connection's current route and the new, potential, best route.
between the routing cost of a connection's current route and the new, potential, best route.
By default, the PXM45 calculates that a route is better if its routing cost is 30% less than the current
cost. You can change this cost threshold through the cnfrteoptthld command.
cost. You can change this cost threshold through the cnfrteoptthld command.
The following briefly characterizes the defaults for cnfrteopt:
•
The default state is disabled.
•
If you do not specify a range, all connections on the port are subject to optimization.
•
If you not specify an interval, optimization begins every 60 minutes.
•
If you do not specify a time of day, the default is any time during the day (but still subject to the
interval of minutes between optimization commencement).
interval of minutes between optimization commencement).
Cards on Which Command Executes
PXM45
Syntax
cnfrteopt
<portid>
[{enable | disable}]