SNMP traps for PPPoE Session Limits

Last Updated: April 18, 2012

The SNMP Traps for PPPoE Session Limits feature provides SNMP MIB support for PPPoE session limits and generates notifications if those limits are reached.

Finding Feature Information

Your software release may not support all the features documented in this module. For the latest feature information and caveats, see the release notes for your platform and software release. To find information about the features documented in this module, and to see a list of the releases in which each feature is supported, see the Feature Information Table at the end of this document.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Prerequisites for SNMP Traps for PPPoE Session Limits

  • PPPoE sessions must be established for this feature to work.

Restrictions for SNMP Traps for PPPoE Session Limits

  • The snmp-server enable traps pppoe command only enables SNMP traps. It does not support inform requests.

Information About SNMP Traps for PPPoE Session Limits

Benefits of Monitoring PPPoE Sessions with SNMP

The monitoring of PPPoE sessions with SNMP provides the following benefits:

  • It helps manage the number of PPPoE sessions configured on a router or PVC by sending notification messages when the PPPoE session threshold has been reached.
  • It provides a way of tracking PPPoE session information over time.

Network Management Protocol

SNMP is a network management protocol used almost exclusively in TCP/IP networks. SNMP provides a means to monitor and control network devices and to manage configurations, statistics collection, performance, and security. SNMP version 2 supports centralized and distributed network management strategies and includes improvements in the Structure of Management Information (SMI), protocol operations, management architecture, and security.

How to Configure SNMP Traps for PPPoE Session Limits

Configuring the PPPoE Session-Count Threshold for the Router

Perform this task to configure the PPPoE session-count threshold for the router.


Note
The sessions max limit command is available only if you configure the bba-group pppoe command using the global keyword.
SUMMARY STEPS

1.    enable

2.    configure terminal

3.    snmp-server enable traps pppoe

4.    bba-group pppoe {group-name | global}

5.    sessions max limit session-number [threshold threshold-value]

6.    virtual-template template-number

7.    end

8.    more system:running-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
snmp-server enable traps pppoe


Example:

Router(config)# snmp-server enable traps pppoe

 

(Optional) Enables PPPoE session count SNMP notifications.

  • This command enables SNMP traps that send notification messages when PPPoE sessions have been reached.
 
Step 4
bba-group pppoe {group-name | global}


Example:

Router(config)# bba-group pppoe global

 

Configures a BBA group to be used to establish PPPoE sessions and enters BBA group configuration mode.

 
Step 5
sessions max limit session-number [threshold threshold-value]


Example:

Router(config-bba-group)# sessions max limit 4000 threshold 3000

 

Configures the PPPoE global profile with the maximum number of PPPoE sessions permitted on a router and sets the PPPoE session-count threshold at which an SNMP trap will be generated.

Note    This command applies only to the global profile.
 
Step 6
virtual-template template-number


Example:

Router(config-bba-group)# virtual-template 1

 

Specifies the virtual template that will be used to clone the virtual access interfaces (VAI).

 
Step 7
end


Example:

Router(config-bba-group)# end

 

Exits BBA group configuration mode and returns to privileged EXEC mode.

 
Step 8
more system:running-config


Example:

Router(#) more system:running-config

 

Displays the running configuration and the PPPoE session-count thresholds.

 

Configuring the PPPoE Session-Count Threshold for a PVC

Perform this task to configure the PPPoE session-count threshold for a PVC.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    snmp-server enable traps pppoe

4.    interface atm slot / subslot / port [.subinterface] [multipoint | point-to-point]

5.    pvc [name] vpi / vci

6.    pppoe max-sessions number-of-sessions [threshold-sessions number-of-sessions]

7.    protocol pppoe

8.    end

9.    more system:running-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
snmp-server enable traps pppoe


Example:

Router(config)# snmp-server enable traps pppoe

 

(Optional) Enables PPPoE session count SNMP notifications.

  • This command enables SNMP traps that send notification messages when PPPoE session thresholds have been reached.
 
Step 4
interface atm slot / subslot / port [.subinterface] [multipoint | point-to-point]


Example:

Router(config)# interface atm 0/0/0.3 point-to-point

 

Configures the ATM interface and enters subinterface configuration mode.

 
Step 5
pvc [name] vpi / vci


Example:

Router(config-subif)# pvc 5/120

 

Creates an ATM PVC and enters ATM VC configuration mode.

 
Step 6
pppoe max-sessions number-of-sessions [threshold-sessions number-of-sessions]


Example:

Router(config-if-atm-vc)# pppoe max-sessions 5 threshold-sessions 3

 

Sets the maximum number of PPPoE sessions that will be permitted on an ATM PVC, PVC range, VC class, or VLAN, and sets the PPPoE session-count threshold at which an SNMP trap will be generated.

 
Step 7
protocol pppoe


Example:

Router(config-if-atm-vc)# protocol pppoe

 

Enables PPPoE sessions to be established on ATM PVCs.

 
Step 8
end


Example:

Router(config-if-atm-vc)# end

 

(Optional) Exits ATM VC configuration mode and returns to sub interface mode.

 
Step 9
more system:running-config


Example:

Router(#) more system:running-config

 

Displays the running configuration and the PPPoE session-count thresholds.

 

Configuring the PPPoE Session-Count Threshold for a VC Class

Perform this task to configure the PPPoE session-count threshold for a VC class.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    snmp-server enable traps pppoe

4.    vc-class atm name

5.    pppoe max-sessions number-of-sessions [threshold-sessions number-of-sessions]

6.    protocol pppoe [group group-name | global]

7.    end

8.    more system:running-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
snmp-server enable traps pppoe


Example:

Router(config)# snmp-server enable traps pppoe

 

(Optional) Enables PPPoE session count SNMP notifications.

  • This command enables SNMP traps that send notification messages when PPPoE session thresholds have been reached.
 
Step 4
vc-class atm name


Example:

Router(config)# vc-class atm main

 

Creates a VC class for an ATM PVC, or SVC, or ATM interface and enters VC class configuration mode.

 
Step 5
pppoe max-sessions number-of-sessions [threshold-sessions number-of-sessions]


Example:

Router(config-vc-class)# pppoe max-sessions 7 threshold-sessions 3

 

Sets the maximum number of PPPoE sessions that will be permitted on an ATM PVC, PVC range, VC class, or VLAN, and sets the PPPoE session-count threshold at which an SNMP trap will be generated.

 
Step 6
protocol pppoe [group group-name | global]


Example:

Router(config-vc-class)# protocol pppoe group one

 

Enables PPPoE sessions to be established.

 
Step 7
end


Example:

Router(config-vc-class)# end

 

(Optional) Exits VC class configuration mode and returns to privileged EXEC mode.

 
Step 8
more system:running-config


Example:

Router(#) more system:running-config

 

Displays the running configuration and the PPPoE session-count thresholds.

 

Configuring the PPPoE Session-Count Threshold for an ATM PVC Range

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    snmp-server enable traps pppoe

4.    interface atm slot / subslot / port [.subinterface] [multipoint | point-to-point]

5.    range [range-name] pvc start-vpi / start-vci end-vpi / end-vci

6.    pppoe max-sessions number-of-sessions [threshold-sessions number-of-sessions]

7.    protocol pppoe [group group-name | global]

8.    end

9.    more system:running-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
snmp-server enable traps pppoe


Example:

Router(config)# snmp-server enable traps pppoe

 

(Optional) Enables PPPoE session count SNMP notifications.

  • This command enables SNMP traps that send notification messages when PPPoE session thresholds have been reached.
 
Step 4
interface atm slot / subslot / port [.subinterface] [multipoint | point-to-point]


Example:

Router(config)# interface atm 0/0/0.3 point-to-point

 

Configures the ATM interface and enters the subinterface configuration mode.

 
Step 5
range [range-name] pvc start-vpi / start-vci end-vpi / end-vci


Example:

Router(config-subif)# range pvc 3/100 3/105

 

Defines a range of ATM PVCs and enters ATM PVC range configuration mode.

 
Step 6
pppoe max-sessions number-of-sessions [threshold-sessions number-of-sessions]


Example:

Router(config-if-atm-range)# pppoe max-sessions 20 threshold-sessions 15

 

Sets the maximum number of PPPoE sessions that will be permitted on an ATM PVC, PVC range, VC class, or VLAN, and sets the PPPoE session-count threshold at which an SNMP trap will be generated.

 
Step 7
protocol pppoe [group group-name | global]


Example:

Router(config-if-atm-range)# protocol pppoe group two

 

Enables PPPoE sessions to be established.

 
Step 8
end


Example:

Router(config-if-atm-range)# end

 

(Optional) Exits ATM PVC range configuration mode and returns to privileged EXEC mode.

 
Step 9
more system:running-config


Example:

Router(#) more system:running-config

 

Displays the running configuration and the PPPoE session-count thresholds.

 

Configuring the PPPoE Session-Count Threshold for an Individual PVC Within a Range

Perform this task to configure the PPPoE session-count threshold for an individual PVC within an ATM PVC range.

SUMMARY STEPS

1.    enable

2.    configure terminal

3.    snmp-server enable traps pppoe

4.    interface atm slot / subslot / port [.subinterface] [multipoint | point-to-point]

5.    range [range-name] pvc start-vpi / start-vci end-vpi /end-vci

6.    pvc-in-range [pvc-name] [vpi / vci]

7.    pppoe max-sessions number-of-sessions [threshold-sessions number-of-sessions]

8.    end

9.    more system:running-config


DETAILED STEPS
  Command or Action Purpose
Step 1
enable


Example:

Router> enable

 

Enables privileged EXEC mode.

  • Enter your password if prompted.
 
Step 2
configure terminal


Example:

Router# configure terminal

 

Enters global configuration mode.

 
Step 3
snmp-server enable traps pppoe


Example:

Router(config)# snmp-server enable traps pppoe

 

(Optional) Enables PPPoE session count SNMP notifications.

  • This command enables SNMP traps that send notification messages when PPPoE session thresholds have been reached.
 
Step 4
interface atm slot / subslot / port [.subinterface] [multipoint | point-to-point]


Example:

Router(config)# interface atm 6/0.110 multipoint

 

Configures the ATM interface and enters subinterface configuration mode.

 
Step 5
range [range-name] pvc start-vpi / start-vci end-vpi /end-vci


Example:

Router(config-subif)# range range1 pvc 3/100 4/199

 

Defines a range of ATM PVCs and enters ATM PVC Range configuration mode.

 
Step 6
pvc-in-range [pvc-name] [vpi / vci]


Example:

Router(config-if-atm-range)# pvc-in-range pvc1 3/104

 

Configures an individual PVC within a PVC range and enters ATM PVC-in-range configuration mode.

 
Step 7
pppoe max-sessions number-of-sessions [threshold-sessions number-of-sessions]


Example:

Router(cfg-if-atm-range-pvc)# pppoe max-sessions 10 threshold-sessions 5

 

Sets the maximum number of PPPoE sessions that will be permitted on an ATM PVC, PVC range, VC class, or VLAN, and sets the PPPoE session-count threshold at which an SNMP trap will be generated.

 
Step 8
end


Example:

Router(cfg-if-atm-range-pvc)# end

 

(Optional) Exits ATM PVC-in-range configuration mode and returns to privileged EXEC mode.

 
Step 9
more system:running-config


Example:

Router(#) more system:running-config

 

Displays the running configuration and the PPPoE session-count thresholds.

 

Monitoring and Maintaining PPPoE Session Counts and SNMP Notifications

Perform the following task to monitor PPPoE sessions counts and SNMP notifications.

SUMMARY STEPS

1.    enable

2.    debug snmp packets

3.    debug pppoe errors [rmac remote-mac-address | interface type number [vc {[vpi /]vci | vc-name}] [vlan vlan-id]]

4.    debug pppoe events [rmac remote-mac-address | interface type number [vc {[vpi /]vci | vc-name}] [vlan vlan-id]]

5.    show vpdn session

6.    show pppoe session


DETAILED STEPS
Step 1   enable

Use this command to enable privileged EXEC mode. Enter your password when prompted.



Example: 
Router> enable
Step 2   debug snmp packets

Use this command to display information about every SNMP packet sent or received by the router:



Example: 
Router# debug snmp packets
SNMP: Packet received via UDP from 192.0.2.11 on GigabitEthernet1/0 
SNMP: Get-next request, reqid 23584, errstat 0, erridx 0 
 sysUpTime = NULL TYPE/VALUE 
 system.1 = NULL TYPE/VALUE 
 system.6 = NULL TYPE/VALUE
SNMP: Response, reqid 23584, errstat 0, erridx 0 
 sysUpTime.0 = 2217027 
 system.1.0 = Cisco Internetwork Operating System Software 
 system.6.0 = 
SNMP: Packet sent via UDP to 192.0.2.11
Step 3   debug pppoe errors [rmac remote-mac-address | interface type number [vc {[vpi /]vci | vc-name}] [vlan vlan-id]]

Use this command to display PPPoE protocol errors that prevent a session from being established or errors that cause an established session to be closed.



Example: 
Router# debug pppoe errors interface atm 1/0.10 
PPPoE protocol errors debugging is on 
Router# 
00:44:30:PPPoE 0:Max session count(1) on mac(00b0.c2e9.c470) reached. 
00:44:30:PPPoE 0:Over limit or Resource low. R:00b0.c2e9.c470 L:ffff.ffff.ffff 0/101 
ATM1/0.10

Step 4   debug pppoe events [rmac remote-mac-address | interface type number [vc {[vpi /]vci | vc-name}] [vlan vlan-id]]

Use this command to display PPPoE protocol messages about events that are part of normal session establishment or shutdown:



Example: 
Router# debug pppoe events interface atm 1/0.10 vc 101

PPPoE protocol events debugging is on 
Router# 
00:41:55:PPPoE 0:I PADI  R:00b0.c2e9.c470 L:ffff.ffff.ffff 0/101 ATM1/0.10 
00:41:55:PPPoE 0:O PADO, R:00b0.c2e9.c470 L:0001.c9f0.0c1c 0/101 ATM1/0.10 
00:41:55:PPPoE 0:I PADR  R:00b0.c2e9.c470 L:0001.c9f0.0c1c 0/101 ATM1/0.10 
00:41:55:PPPoE :encap string prepared 
00:41:55:[3]PPPoE 3:Access IE handle allocated 
00:41:55:[3]PPPoE 3:pppoe SSS switch updated 
00:41:55:[3]PPPoE 3:AAA unique ID allocated 
00:41:55:[3]PPPoE 3:No AAA accounting method list 
00:41:55:[3]PPPoE 3:Service request sent to SSS 
00:41:55:[3]PPPoE 3:Created  R:0001.c9f0.0c1c L:00b0.c2e9.c470 0/101 ATM1/0.10 
00:41:55:[3]PPPoE 3:State REQ_NASPORT    Event MORE_KEYS 
00:41:55:[3]PPPoE 3:O PADS  R:00b0.c2e9.c470 L:0001.c9f0.0c1c 0/101 ATM1/0.10 
00:41:55:[3]PPPoE 3:State START_PPP    Event DYN_BIND 
00:41:55:[3]PPPoE 3:data path set to PPP 
00:41:57:[3]PPPoE 3:State LCP_NEGO    Event PPP_LOCAL 
00:41:57:PPPoE 3/SB:Sent vtemplate request on base Vi2 
00:41:57:[3]PPPoE 3:State CREATE_VA    Event VA_RESP 
00:41:57:[3]PPPoE 3:Vi2.1 interface obtained 
00:41:57:[3]PPPoE 3:State PTA_BIND    Event STAT_BIND 
00:41:57:[3]PPPoE 3:data path set to Virtual Access 
00:41:57:[3]PPPoE 3:Connected PTA
Step 5   show vpdn session

Use this command to display information about active Level 2 Forwarding (L2F) protocol tunnel and message identifiers on a VPDN:



Example: 
Router# show vpdn session
%No active L2TP tunnels
%No active L2F tunnels
PPPoE Session Information Total tunnels 1 sessions 1
PPPoE Session Information
SID        RemMAC          LocMAC       Intf    VASt    OIntf    VC
1       0010.7b01.2cd9  0090.ab13.bca8  Vi4     UP      AT6/0   0/10
Step 6   show pppoe session

Use this command to display information about the currently active PPPoE sessions:



Example: 
Router# show pppoe session
     3 sessions in LOCALLY_TERMINATED (PTA) State
     3 sessions total
 
Uniq ID  PPPoE  RemMAC          Port            VT  VA         State
           SID  LocMAC                              VA-st      Type
      1      1  0007.b3dc.a41c  ATM0/3/1.100     1  Vi2.1      PTA  
                001a.3045.0331  VC: 99/100          UP              
      2      2  0007.b3dc.a41c  ATM0/3/1.100     1  Vi2.2      PTA  
                001a.3045.0331  VC: 99/100          UP              
      3      3  0007.b3dc.a41c  ATM0/3/1.100     1  Vi2.3      PTA  
                001a.3045.0331  VC: 99/100          UP              
Router#

Configuration Examples for SNMP Traps for PPPoE Session Limits

Example: Configuring PPPoE Session-Count SNMP Traps

The following example shows how to enable the router to send PPPoE session-count SNMP notifications to the host at the address 192.10.2.10: 

snmp-server community public RW
snmp-server enable traps pppoe
snmp-server host 192.10.2.10 version 2c public udp-port 1717

Example: Configuring PPPoE Session-Count Threshold for the Router

The following example shows a limit of 4000 PPPoE sessions configured for the router. The PPPoE session-count threshold is set at 3000 sessions, so when the number of PPPoE sessions on the router reaches 3000, an SNMP trap will be generated. 

bba-group pppoe pppoe1
 sessions max limit 4000 threshold 3000
 virtual-template 1
pppoe limit max-sessions 4000 threshold-sessions 3000

Example: Configuring PPPoE Session-Count Threshold for a PVC

The following example shows a limit of five PPPoE sessions configured for the PVC. The PPPoE session-count threshold is set at three sessions, so when the number of PPPoE sessions on the PVC reaches three, an SNMP trap will be generated. 

interface ATM 0/0/0
 ip address 10.0.0.1 255.255.255.0
 no atm ilmi-keepalive
 pvc 5/120
  protocol ip 10.0.0.2 broadcast 
  pppoe max-sessions 5 threshold-sessions 3
  protocol pppoe

Example: Configuring PPPoE Session-Count Threshold for a VC Class

The following example shows a limit of seven PPPoE sessions configured for a VC class called "main." The PPPoE session-count threshold is set at three sessions, so when the number of PPPoE sessions for the VC class reaches three, an SNMP trap will be generated. 

vc-class atm main
  protocol pppoe group global
vc-class atm global
  protocol pppoe
  pppoe max-sessions 7 threshold-sessions 3

Example: Configuring PPPoE Session-Count Threshold for a PVC Range

The following example shows a limit of 20 PPPoE sessions configured for the PVC range. The PPPoE session-count threshold will also be 20 sessions because when the session-count threshold has not been explicitly configured, it defaults to the PPPoE session limit. An SNMP trap will be generated when the number of PPPoE sessions for the range reaches 20. 

interface ATM 0/0/0.3 point-to-point
 range pvc 3/100 3/105
  pppoe max-sessions 20 threshold-sessions 15
  protocol pppoe

Example: Configuring PPPoE Session-Count Threshold for an Individual PVC Within a PVC Range

The following example shows a limit of ten PPPoE sessions configured for pvc1. The PPPoE session-count threshold is set at three sessions, so when the number of PPPoE sessions for the PVC reaches three, an SNMP trap will be generated. 

interface atm 6/0.110 multipoint
 range range1 pvc 100 4/199
  pvc-in-range pvc1 3/104
   pppoe max-sessions 10 threshold-sessions 3

Additional References

Related Documents

Related Topic Document Title

Cisco IOS commands

Cisco IOS Master Commands List, All Releases

Broadband Access Aggregation and DSL commands

Cisco IOS Broadband Access Aggregation and DSL Command Reference

MIBs

MIB MIBs Link
None

To locate and download MIBs for selected platforms, Cisco software releases, and feature sets, use Cisco MIB Locator found at the following URL:

http://www.cisco.com/go/mibs

Technical Assistance

Description Link

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http://www.cisco.com/cisco/web/support/index.html

Feature Information for SNMP Traps for PPPoE Session Limits

The following table provides release information about the feature or features described in this module. This table lists only the software release that introduced support for a given feature in a given software release train. Unless noted otherwise, subsequent releases of that software release train also support that feature.

Use Cisco Feature Navigator to find information about platform support and Cisco software image support. To access Cisco Feature Navigator, go to www.cisco.com/go/cfn. An account on Cisco.com is not required.

Table 1 Feature Information for SNMP Traps for PPPoE Session Limits
Feature Name Releases Feature Information

SNMP Traps for PPPoe Session Limits

Cisco IOS XE Release 2.6

15.1(1)SG

The SNMP Traps for PPPoE Session Limits feature implements SNMP MIB support for PPPoE session limits and generates notifications in case the limits are reached.

The following commands were introduced or modified: snmp-server enable traps pppoe.

© 2012 Cisco Systems, Inc. All rights reserved.