Specifications

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Cisco MGX 8800/8900 Series Software Configuration Guide
Release 5.1, Part Number OL-6482-01, Rev. A0, January 25, 2005
Chapter 8 Managing PNNI Nodes and PNNI Routing
Managing Connection Grooming
9.2 done 0 0 0 0 0 0 0 0 0
0 0 0
11.1 done 0 0 0 0 0 0 0 0 0
0 0 0
11.5 done 0 0 0 0 0 0 0 0 0
0 0 0
The grooming statistics column head abbreviations are described above the command display.
Configuring the AIS Delay
An alarm indication signal (AIS) is sent to CPE at each end of a connection when the switch detects a
connection alarm. The derouting of a connection triggers the AIS signal, and depending on the CPE
configuration, the derouting may trigger a switchover of the CPE to backup facilities. The AIS delay
timer feature is designed to delay a locally generated AIS event long enough that a new connection can
be established during grooming. If the new connection is established before the end of the AIS delay, no
AIS is generated.
Note The AIS delay does not affect AIS signals generated on other switches and forwarded to this switch.
When configuring the AIS delay, consider the following guidelines:
• The AIS delay timer applies only to persistent (double-ended) P2P connections.
• The AIS delay timer only applies during connection grooming. If an AIS is generated for another
reason, such as a failed link, the AIS is sent immediately.
• We recommend that the AIS delay feature remain disabled until all network nodes have been
upgraded to Cisco MGX software Release 4 or later.
• During switchover, the configured AIS delay may be doubled as it is applied to one PXM and then
the other.
The AIS delay feature is disabled by default. To change the AIS delay period, enter the cnfaisdelaytimer
command as follows:
PXM1E_SJ.7.PXM.a > cnfaisdelaytimer <timer_value>
Replace the timer_value variable with a number in the range of 0 to 60. If you enter 0, the AIS delay is
disabled. To enable the AIS delay and select a delay time, enter a number in the range of 1 to 60 seconds.
The following example enables the AIS delay timer, sets the delay to 15 seconds, and uses the
dspaisdelaytimer command to display the configuration change.
PXM1E_SJ.7.PXM.a > cnfaisdelaytimer 15
PXM1E_SJ.7.PXM.a > dspaisdelaytimer
AIS Delay Timer:15 seconds
Enabling and Disabling the Soft Reroute IE
When soft rerouting is enabled and the grooming operation sets up a new connection, the soft reroute
information element (IE) is forwarded along the new route as part of the soft reroute capability
negotiation. If any switch along the call route cannot accept the soft reroute IE, you can block forwarding
of the IE on the appropriate interface.
Use the following procedure to manage the forwarding of the soft reroute IE.