Beta Draft Confidential
Configuring ATM PVCs
About the PVC Tabs
ATM Services Configuration Guide for CBX 3500, CBX 500, GX 550, and B-STDX 9000
1/19/05
10-21
How PVC Routing Thresholds Interact With LPort Routing Metrics
If you enable the PVC Admin Cost and/or End-End Delay (cell transfer delay [CTD])
Thresholds, you should be aware of the following interactions with the UNI/NNI
logical port routing metrics (see
“Setting QoS Parameters” on page 3-51
interactions also apply to the PVC CDV and CLR thresholds described in
“Completing the PVC Configuration” on page 10-33
Admin Cost Threshold Enabled — If you enable the Admin Cost Threshold field,
the system does not override the originating node logical port routing metric. Instead,
OSPF and VNN use the routing metric to route the circuit (provided that the selected
path has an admin cost less than the configured threshold).
CDV Enabled — In most cases, the system uses the routing metric associated with
the originating node logical port. However, if you enable the CDV (or CTD) threshold,
the system overrides the LPort routing metric with the enabled CVD (or CTD)
threshold. This means that if you choose the default admin cost routing metric on the
logical port and enable the CDV (or CTD) threshold, OSPF and VNN route the circuit
on a path with the lowest CDV (or CTD), even if the circuit has a higher admin cost
than other network paths.
CLR Enabled — If you enable the CLR threshold, the system does not override the
originating node logical port routing metric. Instead, OSPF and Virtual Network
Navigator (VNN) use the routing metric to route the circuit (provided that each trunk
in the path has a larger CLR than the configured threshold).
CrankBack Info
Required
Enable or disable collection of crankback information.
Select the check box to collect and maintain the crankback
information on the traced path. Clear the check box ( default) for
the crankback information to not be collected.
Pass Along Request
Enable or disable pass along request for this path trace.
Select this check box (default) to have the path trace continue
through nodes that do not support the path trace feature, causing
the trace results to contain some gaps.
Clear the check box to cause the path trace to terminate at any
switch that does not support the path trace feature. A partial path
trace will be returned.
Path Trace Timeout
(sec) (1-65535)
Enter a number of seconds (0-65535) for which you want the
trace results to be maintained in the switch. The default is ten
minutes (600 seconds).
Table 10-3.
Add PVC: Administrative Tab Fields (Continued)
Field
Action/Description
Summary of Contents for CBX 3500
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