CISCO-PPPOE-MIB

MIB Reference — IPNetwork Monitor · Updated October 05, 2026

All MIBs › CISCO-PPPOE-MIB

Organization: Cisco Systems, Inc.

Last Updated: 2011-04-25

Category: Cisco Devices, DSL and Broadband

Description: Manages PPPoE session establishment, authentication, and statistics on Cisco broadband access routers.

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What Is CISCO-PPPOE-MIB?

CISCO-PPPOE-MIB manages PPP over Ethernet (PPPoE) session establishment and enforces per-system, per-MAC, per-VLAN, and per-VC session limits on Cisco broadband access routers. It belongs to the broadband access/subscriber-management networking area, commonly used by ISPs terminating DSL or Ethernet-based PPPoE subscriber sessions. Its data is heavily performance and capacity-monitoring oriented: cPppoeSystemCurrSessions and cPppoeSystemHighWaterSessions track current versus historical peak session counts against cPppoeSystemMaxAllowedSessions, while cPppoeSystemExceededSessionErrors counts rejected sessions—together revealing when a broadband access concentrator is nearing subscriber-session capacity or under a denial-of-service-style session flood. Granular limits such as cPppoeSystemPerMacSessionlimit, cPppoeSystemPerVLANlimit, and cPppoeSystemPerVClimit (with matching throttle rate-limit objects) let operators monitor and enforce fair-use session caps per subscriber, VLAN, or virtual circuit. This MIB is deployed on Cisco broadband aggregation routers (e.g., BRAS/BNG platforms) in DSL and Ethernet-access ISP networks. Engineers searching for cisco pppoe reference this MIB to monitor PPPoE session state and statistics via SNMP on Cisco access equipment.

IPNetwork Monitor allows you to monitor SNMP objects defined in CISCO-PPPOE-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

  • Cisco broadband access router (BRAS/BNG)

Monitoring Examples

A broadband operator polls cPppoeSystemCurrSessions against cPppoeSystemMaxAllowedSessions and watches cPppoeSystemThresholdSessions to get early warning as a BRAS approaches its configured session ceiling during peak evening hours. A rising cPppoeSystemExceededSessionErrors count alongside a spike in sessions from a single MAC (bounded by cPppoeSystemPerMacSessionlimit) would flag a misbehaving CPE or a PPPoE session-flood attack that the per-MAC throttle rate limit should be curbing.

What Can Be Monitored

  • current and peak PPPoE session counts
  • maximum allowed sessions and threshold
  • exceeded session error count
  • per-MAC/per-VLAN/per-VC session limits and throttle rate limits
Imported Objects

From ATM-MIB

atmVclEntryOBJECT-TYPE
atmVclVciOBJECT-TYPE
atmVclVpiOBJECT-TYPE

From ATM-TC-MIB

AtmVcIdentifier
AtmVpIdentifier

From CISCO-QOS-PIB-MIB

Percent

From CISCO-SMI

ciscoMgmtOBJECT-IDENTITY

From IF-MIB

ifDescrOBJECT-TYPE
ifIndexOBJECT-TYPE

From Q-BRIDGE-MIB

VlanId
VlanIndex

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Gauge32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

MacAddress
TruthValue

How to Use in IPNetwork Monitor

Example using cPppoeSystemExceededSessionErrors OID:

Select a Cisco broadband access router as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type cPppoeSystemExceededSessionErrors into the Find box to locate it in the OID tree, then select it and click OK. The accumulated number of errors for establishing PPPoE session in the system due to the cPppoeSystemCurrSessions value exceeds the cPppoeSystemMaxAllowedSessions value. On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases between polls, since a rising count of errors, failures, or discards often points to a real underlying problem. Click Finish to create the monitor; you can adjust any parameter later.
OIDs

RFC description

Cisco PPPoE (Point-to-Point Protocol over Ethernet) sessions management MIB for monitoring and controlling PPPoE connections.

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Download CISCO-PPPOE-MIB