ASCEND-MIBL2TUNNEL-MIB

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Category: VPN and Security, Vendor: Ascend/Lucent

Description: Manages Layer 2 tunneling protocol (L2TP/L2F) session and tunnel parameters on Ascend equipment.

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What Is ASCEND-MIBL2TUNNEL-MIB?

ASCEND-MIBL2TUNNEL-MIB is a proprietary Ascend Communications MIB for managing Layer 2 Tunneling Protocol (L2TP) and Layer 2 Forwarding (L2F) tunnels and sessions on Ascend remote-access equipment. It exposes configuration and state data for tunnel endpoints, active sessions, and per-tunnel/per-session parameters rather than physical-layer counters. Its monitoring value lies chiefly in software/service status: tracking how many tunnels and sessions are active, whether tunnel negotiation succeeded, and whether sessions are being dropped or failing to establish, which is a strong indicator of remote-access service health. It builds on the vendor's PPP and dial-related MIBs since L2TP/L2F sessions typically wrap PPP connections. It was used in ISP and enterprise dial-up/VPDN access concentrators where tunneled PPP sessions were aggregated back to a home gateway, with ASCEND-MIBL2TUNNEL-MIB SNMP monitoring used to track tunnel and session health across the concentrator.

IPNetwork Monitor allows you to monitor SNMP objects defined in ASCEND-MIBL2TUNNEL-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

Ascend remote-access concentrator (MAX/TNT series)
Ascend VPDN/dial-up access gateway

Monitoring Examples

An operator would poll tunnel and session tables (an ascendL2TunnelTable/ascendL2SessionEntry style structure) to see active tunnel counts and per-session state, flagging a sudden drop in established sessions or a spike in failed tunnel setups as a sign of authentication or connectivity problems with the LNS/LAC peer. Because no sample objects were provided for this MIB, the table names above are a plausible reconstruction based on the described purpose rather than confirmed source identifiers.

What Can Be Monitored

active tunnel count
active session count
tunnel establishment failures
session negotiation status
tunnel endpoint addresses

Imported Objects

From ASCEND-MIB

configuration

OBJECT-IDENTITY

From RFC-1212

OBJECT-TYPE

From RFC1155-SMI

IpAddress

OIDs

OID symbolic	OID numeric	Type	Access	Description
INT l2TunnelGlobal_Action_o	1.3.6.1.4.1.529.23.90.1.1.26	INTEGER	read-write
INT l2TunnelGlobal_Index_o	1.3.6.1.4.1.529.23.90.1.1.1	INTEGER	read-only
INT l2TunnelGlobal_L2fIgnoreMidSequence	1.3.6.1.4.1.529.23.90.1.1.25	INTEGER	read-write	Determines whether a common sequence number is used for the L2F_PROTO PDUs for both the tunnel (MID=0) and the client connection.
INT l2TunnelGlobal_L2fMode	1.3.6.1.4.1.529.23.90.1.1.20	INTEGER	read-write	Layer Two Forwarding operating mode.
INT l2TunnelGlobal_L2fRetryCount	1.3.6.1.4.1.529.23.90.1.1.22	INTEGER	read-write	The number of times L2F will resend control packets. The standard value as outlined in RFC2341 is 4.
INT l2TunnelGlobal_L2fRetryInterval	1.3.6.1.4.1.529.23.90.1.1.23	INTEGER	read-write	The interval between retries in seconds. A value of 0 (zero) means that an adaptative retry interval based on the retry number is used.
STR l2TunnelGlobal_L2fSystemName	1.3.6.1.4.1.529.23.90.1.1.21	DisplayString	read-write	Sent to the remote tunnel endpoint during L2F tunnel establishment. An empty string indicates that the actual system name plus domain name will be used.
INT l2TunnelGlobal_L2fTunnelSecret	1.3.6.1.4.1.529.23.90.1.1.24	INTEGER	read-write	The authentication method used on the NAS to authenticate the home Gateway during L2F Tunnel establishment.
INT l2TunnelGlobal_L2tpAuthEnabled	1.3.6.1.4.1.529.23.90.1.1.5	INTEGER	read-write	Enables or disables L2TP tunnel authentication.
INT l2TunnelGlobal_L2tpConfig_AcctTunnelConnectionEncoding	1.3.6.1.4.1.529.23.90.1.1.18	INTEGER	read-write	Encoding of the Acct-Tunnel-Connection radius attribute
INT l2TunnelGlobal_L2tpConfig_BaseUdpPort	1.3.6.1.4.1.529.23.90.1.1.15	INTEGER	read-write	This value defines the base L2TP udp port to use for a card. A value of zero (the default) means that a non private port will be allocated dynamically.
INT l2TunnelGlobal_L2tpConfig_ControlConnectEstablishTimer	1.3.6.1.4.1.529.23.90.1.1.12	INTEGER	read-write	The timeout interval for L2TP to establish a control connection session with its peer, in seconds.
INT l2TunnelGlobal_L2tpConfig_DataPktUdpCksum	1.3.6.1.4.1.529.23.90.1.1.35	INTEGER	read-write	If IP-GLOBAL:udp-cksum is set to TRUE, setting this field to 'no' disables the locally originated UDP checksum calculation for L2TP data packets.
STR l2TunnelGlobal_L2tpConfig_DefaultTunnelServer	1.3.6.1.4.1.529.23.90.1.1.28	DisplayString	read-write	Default tunnel server profile name. Used for dialout only.
INT l2TunnelGlobal_L2tpConfig_DialoutAuthLns	1.3.6.1.4.1.529.23.90.1.1.16	INTEGER	read-write	Restricts the LAC to accept dialout requests only from the LNS which has authenticated during the tunnel setup.
INT l2TunnelGlobal_L2tpConfig_DialoutSendProfileName	1.3.6.1.4.1.529.23.90.1.1.17	INTEGER	read-write	Enables the LNS to send the Connection Profile Name VSA along with the Dialout Request.
INT l2TunnelGlobal_L2tpConfig_DigitalAsyncNasPortType	1.3.6.1.4.1.529.23.90.1.1.32	INTEGER	read-write	If LNS Acct NPT is set to PortTypeAvp but the LAC did not supply the NAS Port Type, report digital-async calls as specified here.
INT l2TunnelGlobal_L2tpConfig_FirstRetryTimer	1.3.6.1.4.1.529.23.90.1.1.9	INTEGER	read-write	The first interval before the L2TP Control Channel Transport Layer retransmits a control packet, in milliseconds. Subsequent retransmissions will increase the interval.
INT l2TunnelGlobal_L2tpConfig_HelloTimer	1.3.6.1.4.1.529.23.90.1.1.11	INTEGER	read-write	The number of seconds that an L2TP Control Channel will be idle before sending a HELLO packet. If set to 0, HELLO packets will not be sent.
INT l2TunnelGlobal_L2tpConfig_LacIncomingCallTimer	1.3.6.1.4.1.529.23.90.1.1.13	INTEGER	read-write	The timeout interval for the LAC to setup an incoming call with the LNS, in seconds.
INT l2TunnelGlobal_L2tpConfig_LnsIncomingCallTimer	1.3.6.1.4.1.529.23.90.1.1.14	INTEGER	read-write	The timeout interval for the LNS to setup an incoming call with the LAC, in seconds.
INT l2TunnelGlobal_L2tpConfig_LnsNasPortType	1.3.6.1.4.1.529.23.90.1.1.31	INTEGER	read-write	LNS NAS Port Type reporting. If Virtual, report virtual. If PortTypeAvp, report as specified by LAC.
INT l2TunnelGlobal_L2tpConfig_MaxCallsPerTunnel	1.3.6.1.4.1.529.23.90.1.1.36	INTEGER	read-write	This value restricts the maximum number of calls that a tunnel can have at a given instance of time. When set to 0 the limit is removed.
INT l2TunnelGlobal_L2tpConfig_MaxRetryTimer	1.3.6.1.4.1.529.23.90.1.1.34	INTEGER	read-write	The maximum timeout interval used by the L2TP Control Channel Transport Layer before retransmitting a packet, in milliseconds. 0 indicates no limit.
INT l2TunnelGlobal_L2tpConfig_RetryCount	1.3.6.1.4.1.529.23.90.1.1.10	INTEGER	read-write	The maximum number of times the L2TP Control Channel Transport Layer will retransmit a control packet.
INT l2TunnelGlobal_L2tpConfig_RetryTimerMode	1.3.6.1.4.1.529.23.90.1.1.33	INTEGER	read-write	The mode in which the L2TP Control Channel Transport Layer retry timer operates. The default is Linear.
INT l2TunnelGlobal_L2tpConfig_SuppressEndpointDiscriminator	1.3.6.1.4.1.529.23.90.1.1.30	INTEGER	read-write	When set to 'yes', in the absence of a MRRU LCP option, the LAC will suppress the Endpoint Discriminator LCP option from the LCP AVPs sent to the LNS.
INT l2TunnelGlobal_L2tpConfig_TunnelServerPreSccrqLookup	1.3.6.1.4.1.529.23.90.1.1.29	INTEGER	read-write	When Tunnel Authentication is enabled, this parameter controls whether a lookup is to be done for the Tunnel-Server profile before sending of the SCCRQ.
INT l2TunnelGlobal_L2tpConfig_VerifyRemoteHostName	1.3.6.1.4.1.529.23.90.1.1.27	INTEGER	read-write	If Tunnel Authentication is enabled, also verify the remote peer HostName AVP.
INT l2TunnelGlobal_L2tpMode	1.3.6.1.4.1.529.23.90.1.1.4	INTEGER	read-write	Layer 2 Tunneling Protocol operating mode.
INT l2TunnelGlobal_L2tpRxWindow	1.3.6.1.4.1.529.23.90.1.1.6	INTEGER	read-write	This value is the advertised L2TP receive window size for the data channel. A value of zero indicates that this box will ask for no flow control for inbound L2TP payloads.
STR l2TunnelGlobal_L2tpSystemName	1.3.6.1.4.1.529.23.90.1.1.8	DisplayString	read-write	Sent to the remote tunnel endpoint during L2TP session establishment. An empty string indicates that the actual system name plus domain name will be used.
INT l2TunnelGlobal_MaxLnsClients	1.3.6.1.4.1.529.23.90.1.1.7	INTEGER	read-write	The maximum number of clients that this box is allowed to support in LNS mode.
INT l2TunnelGlobal_PptpEnabled	1.3.6.1.4.1.529.23.90.1.1.2	INTEGER	read-write	Enables or disables support for the Point to Point Tunneling Protocol (PPTP).
INT l2TunnelGlobal_ServerProfileRequired	1.3.6.1.4.1.529.23.90.1.1.3	INTEGER	read-write	When set to 'YES', it requires that an enabled TUNNEL-SERVER profile exists before a tunnel is created. When set to 'NO', if a matching profile can't be found, the server is assumed enabled and the tunnel can be created.
mibl2TunnelGlobal	1.3.6.1.4.1.529.23.90
mibl2TunnelGlobalEntry	1.3.6.1.4.1.529.23.90.1.1		not-accessible	A mibl2TunnelGlobal entry containing objects that maps to the parameters of mibl2TunnelGlobal profile.
mibl2TunnelGlobalTable	1.3.6.1.4.1.529.23.90.1		not-accessible	A list of mibl2TunnelGlobal profile entries.
mibtunnelServer	1.3.6.1.4.1.529.23.91
mibtunnelServer_DialoutOptions_DefaultCallMappingEntry	1.3.6.1.4.1.529.23.91.2.1		not-accessible	A mibtunnelServer__dialout_options__default_call_mapping entry containing objects that maps to the parameters of mibtunnelServer__dialout_options__default_call_mapping profile.
mibtunnelServer_DialoutOptions_DefaultCallMappingTable	1.3.6.1.4.1.529.23.91.2		not-accessible	A list of mibtunnelServer__dialout_options__default_call_mapping profile entries.
mibtunnelServerEntry	1.3.6.1.4.1.529.23.91.1.1		not-accessible	A mibtunnelServer entry containing objects that maps to the parameters of mibtunnelServer profile.
mibtunnelServerTable	1.3.6.1.4.1.529.23.91.1		not-accessible	A list of mibtunnelServer profile entries.
INT tunnelServer_Action_o	1.3.6.1.4.1.529.23.91.1.1.16	INTEGER	read-write
STR tunnelServer_ClientAuthId	1.3.6.1.4.1.529.23.91.1.1.7	DisplayString	read-write	The system name used by the Tunnel Initiator during Tunnel establishment for the purposes of tunnel authentication. This is different and independent from user authentication. In L2TP, this name is sent on the SCCRQ command. Used on L2TP and L2F.
INT tunnelServer_DialoutOptions_DefaultCallMapping_BearerType	1.3.6.1.4.1.529.23.91.2.1.4	INTEGER	read-write	The bearer type used for the outgoing call.
INT tunnelServer_DialoutOptions_DefaultCallMapping_DataService	1.3.6.1.4.1.529.23.91.2.1.6	INTEGER	read-write	The type of data service used for outgoing call for this bearer and framing type combination.
INT tunnelServer_DialoutOptions_DefaultCallMapping_FramingType	1.3.6.1.4.1.529.23.91.2.1.5	INTEGER	read-write	The framing type used for the outgoing call.
INT tunnelServer_DialoutOptions_DefaultCallMapping_Index_o	1.3.6.1.4.1.529.23.91.2.1.2	INTEGER	read-only
STR tunnelServer_DialoutOptions_DefaultCallMapping_ServerEndpoint	1.3.6.1.4.1.529.23.91.2.1.1	DisplayString	read-only
INT tunnelServer_DialoutOptions_DefaultCallMapping_ValidEntry	1.3.6.1.4.1.529.23.91.2.1.3	INTEGER	read-write	When FALSE, this entry should be skipped when mapping calls.
INT tunnelServer_DialoutOptions_DialNumberLookup	1.3.6.1.4.1.529.23.91.1.1.17	INTEGER	read-write	If enabled, uses the dial number passed by the LNS to lookup a connection profile.
STR tunnelServer_DialoutOptions_DialNumberPrefix	1.3.6.1.4.1.529.23.91.1.1.19	DisplayString	read-write	A number to be prepended to the dialout number when placing the call. It can be used to provide locally required prefixes such as trunk numbers.
INT tunnelServer_DialoutOptions_Enabled	1.3.6.1.4.1.529.23.91.1.1.9	INTEGER	read-write	Enables/Disables L2TP Dialout from this tunnel-server.
STR tunnelServer_DialoutOptions_LookupPrefix	1.3.6.1.4.1.529.23.91.1.1.18	DisplayString	read-write	A short text string prepended to the username portion of a RADIUS L2TP dial number lookup request. It is used to distinguish between DNIS and CLID authentication requests and L2TP lookup request.
INT tunnelServer_Enabled	1.3.6.1.4.1.529.23.91.1.1.2	INTEGER	read-write	A tunnel server can be disabled by setting this field to 'no'.
STR tunnelServer_IpsecProfile	1.3.6.1.4.1.529.23.91.1.1.6	DisplayString	read-write	Name of the ipsec profile which should be used to build the IPSec Scheme for the IP Packets sent and received from this server.
INT tunnelServer_MaxClients	1.3.6.1.4.1.529.23.91.1.1.4	INTEGER	read-write	The maximum number of clients that this tunnel may carry.
STR tunnelServer_ServerAuthId	1.3.6.1.4.1.529.23.91.1.1.8	DisplayString	read-write	The system name used by the Tunnel Terminator during Tunnel establishment for the purposes of tunnel authentication. This is different and independent from user authentication. In L2TP, this name is sent on the SCCRP command. Used on L2TP and L2F.
STR tunnelServer_ServerEndpoint	1.3.6.1.4.1.529.23.91.1.1.1	DisplayString	read-only	The name of the remote tunnel endpoint. It should be the hostname or IP address that identifies the remote tunnel server, as required by the specific tunnel protocol. Usually, it matches the 'Tunnel-Server-Endpoint' RADIUS attribute but it may be different.
STR tunnelServer_SharedSecret	1.3.6.1.4.1.529.23.91.1.1.3	DisplayString	read-write	The shared secret (password) needed to bring up an L2TP Control Channel or an L2F tunnel with this server.
INT tunnelServer_ValidCallTypes	1.3.6.1.4.1.529.23.91.1.1.5	INTEGER	read-write	The valid call types that can be carried on this tunnel.

RFC description

Ascend L2TP tunnel server configuration and management with authentication and client control parameters.

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Download ASCEND-MIBL2TUNNEL-MIB

What Is ASCEND-MIBL2TUNNEL-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

Related MIBs

RFC description