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Information About Configuring PPP over Ethernet Session Limit Support
Benefits of Configuring PPP over Ethernet Session Limit Support
The PPPoE Session Limit Support feature prevents the router from using too much memory for virtual access by limiting the number of PPPoE sessions that can be created on a router or on all Ethernet interfaces and subinterfaces as well as ATM interfaces and subinterfaces.
The SNMP Enhancements for ASR 1000 feature enhances Cisco ASR 1000 Aggregation Series Router to count the PPPoE sessions in PTA, FWDED, and TRANS state for a particular physical interface, and the total number of sessions that exist in a physical interface. Provision for using a system-wide threshold trap and per-physical threshold trap is provided through SNMP. These functionalities enable users to retrieve the total number of sessions and per-interface session-loss threshold value.
In scenarios where you must deploy ASR 1000 Series Routers with one physical port mapped to one DSLAM and if the total number of sessions for the DSLAM falls below the threshold value on a physical interface, due to a loss of high number of sessions, a notification trap is generated. You can use these traps to investigate the issue and take immediate actions.
When the number of active sessions falls below the threshold value, only one trap is generated. Further traps are not sent even if the number of sessions continue to decrease. The next set of traps are sent only if the number of sessions rise above the configured threshold value and fall. This criterion is applicable to both global and per-interface traps.
When threshold values are configured in both global and per-interface configuration modes, then both the threshold values are monitored separately. Traps are sent when the session count falls below the threshold value either in global configuration mode or in per-interface configuration mode.
How to Configure PPP over Ethernet Session Limit Support
Router(config-bba-group)# sessions max limit 32000
Configures the PPPoE global profile with the maximum number of PPPoE sessions that will be permitted on a router, and sets the PPPoE session-count threshold at which a Simple Network Management Protocol (SNMP) trap will be generated.
This command applies only to the global profile.
Returns to global configuration mode.
Specifying the Maximum Number of PPPoE Sessions on a Gigabit Ethernet Interface
Perform this task to specify the maximum number of PPPoE sessions that can be created on a Gigabit Ethernet interface.
No new or modified RFCs are supported by this feature, and support for existing RFCs has not been modified by this feature.
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Feature Information for Configuring PPP over Ethernet Session Limit Support
Table 1 Feature Information for Providing PPP over Ethernet Session Limit Support
PPP over Ethernet Session Limit Support
Cisco IOS XE Release 2.1 Cisco IOS XE Release 2.4
This feature was introduced on Cisco ASR 1000 Series Aggregation Services Routers.
The PPPoE Session Limit Support feature enables you to limit the number of PPPoE sessions that can be created on a router or on a Gigabit Ethernet interface for configuration.
This feature was integrated into Cisco IOS XE Release 2.4.
SNMP Enhancements for ASR 1000
Cisco IOS XE Release 3.2S
The SNMP Enhancements for ASR 1000 feature enhances Cisco ASR 1000 Aggregation Series Routers to provide the count of the PPPOE sessions in PTA, Forwarded, and TRANS state for a particular physical interface, and the total count of sessions that exist in a physical interface.
This feature was introduced in Cisco IOS XE 3.2S.
The following commands were introduced or modified: pppoe-sessionsthreshold, sessionsthreshold.