H3C-L2TP-MIB

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Organization: Hangzhou H3C Tech. Co., Ltd.

Last Updated: 2013-07-05

Category: Protocol: L2TP, Vendor: H3C/HH3C

Description: H3C MIB for Layer 2 Tunneling Protocol (L2TP) managing tunnels, sessions, and associated LAC/LNS statistics.

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What Is H3C-L2TP-MIB?

H3C-L2TP-MIB is an H3C private-enterprise MIB for Layer 2 Tunneling Protocol (L2TP) management, used to tunnel PPP sessions across an IP network between an LAC (L2TP Access Concentrator) and an LNS (L2TP Network Server), commonly for VPN or dial-up session aggregation. It exposes tunnel- and session-level statistics: total active tunnels, total active sessions, and the rate of new session establishment. Its monitoring emphasis is performance/capacity and service-health status: an operator tracks how many L2TP tunnels and sessions are active and how quickly new sessions are being set up, useful for spotting capacity limits or a surge or sudden drop in VPN dial-in activity. It implements the IETF L2TP standard (RFC 2661 and successors) as an H3C private-MIB view into that protocol's runtime state. Deployment context is H3C routers/BRAS devices acting as L2TP LAC or LNS endpoints for remote-access VPN or broadband PPP session aggregation, and the H3C-L2TP-MIB download is typically obtained from H3C's support site alongside the device's other private MIBs.

IPNetwork Monitor allows you to monitor SNMP objects defined in H3C-L2TP-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

H3C router/BRAS acting as L2TP LAC or LNS

Monitoring Examples

An administrator polls h3cL2tpStatsTotalTunnels and h3cL2tpStatsTotalSessions to track overall L2TP load on the device, and watches h3cL2tpSessionRate to see the current rate of new session establishment. A sudden drop in h3cL2tpStatsTotalSessions alongside a spike in h3cL2tpSessionRate could indicate mass session flapping or a remote-access outage that is repeatedly disconnecting and reconnecting many VPN users simultaneously.

What Can Be Monitored

total active L2TP tunnels
total active L2TP sessions
session establishment rate

Imported Objects

From HUAWEI-3COM-OID-MIB

h3cCommon

OBJECT-IDENTITY

From SNMPv2-SMI

Counter32
Integer32
MODULE-IDENTITY
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using h3cL2tpStatsTotalTunnels OID:

Select an H3C router/BRAS acting as L2TP LAC or LNS 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 h3cL2tpStatsTotalTunnels into the Find box to locate it in the OID tree, then select it and click OK. The total number of tunnels at the time of querying. 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 sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
h3cL2tp	1.3.6.1.4.1.2011.10.2.139			This MIB contains objects to manage configuration of L2TP. There are no constraints on this MIB.
h3cL2tpObjects	1.3.6.1.4.1.2011.10.2.139.1
h3cL2tpScalar	1.3.6.1.4.1.2011.10.2.139.1.1
h3cL2tpStats	1.3.6.1.4.1.2011.10.2.139.1.1.1
C32 h3cL2tpStatsTotalTunnelsEx	1.3.6.1.4.1.2011.10.2.139.1.1.1.1	Counter32	read-only	The total number of tunnels at the time of querying.
C32 h3cL2tpStatsTotalSessions	1.3.6.1.4.1.2011.10.2.139.1.1.1.2	Counter32	read-only	The total number of sessions at the time of querying.
I32 h3cL2tpSessionRate	1.3.6.1.4.1.2011.10.2.139.1.1.1.3	Integer32	read-only	The number of sessions that were created in the previous second.

RFC description

Manages Layer 2 Tunneling Protocol statistics and tunnel/session configuration for H3C devices.

Start monitoring H3C router/BRAS acting as L2TP LAC or LNS with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

Download H3C-L2TP-MIB