SLED-MIB

All MIBs › SLED-MIB

Organization: CableLabs eDOCSIS Working Group

Last Updated: 2007-05-18

Category: CableLabs DOCSIS

Description: Manages CableLabs eDOCSIS SLED device configuration, software download, and operational status for embedded DOCSIS.

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What Is SLED-MIB?

SLED-MIB is a CableLabs specification MIB, part of the DOCSIS/eDOCSIS family, that manages the Software Loopback Application for embedded DOCSIS (SLED) functionality found in cable-modem-embedded devices such as eMTAs and set-top gateways. It exposes configuration objects to enable the loopback application globally and per interface, define loopback packet header parameters, and configure a packet generator with payload, rate, packet count, and trigger settings. Administrators use it to monitor and control an embedded diagnostic test tool -- checking whether loopback and packet-generation are enabled, what rate and count a test run was configured with, and when it was last triggered (sledPktGenLastTrigger) -- which is useful for verifying that a cable operator's remote diagnostic/test capability on the device is functioning. It is defined as part of the CableLabs eDOCSIS specification family and depends on that broader DOCSIS device architecture for context. It is typically deployed on eDOCSIS-embedded devices in cable broadband access networks for remote diagnostic testing. Engineers can download the SLED-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in SLED-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

eDOCSIS-embedded cable device (e.g., cable modem/eMTA with embedded application)

Monitoring Examples

An operator troubleshooting a suspected line issue would set sledLoopbackEnable and sledPktGenTrigger to initiate a test, then poll sledPktGenRate and sledPktGenNumPkts to confirm the generator ran with the intended parameters, and check sledPktGenLastTrigger to verify when the last test executed. If sledGlobalEnable is off, none of the per-interface settings under sledLoopbackInterface and sledPktGenInterface will take effect, explaining why a requested diagnostic test produced no results. Reviewing sledPktGenPayload and sledLoopbackPktHdr helps confirm the exact test packet content used during the diagnostic run.

What Can Be Monitored

loopback feature enable status
packet generator rate and packet count
last diagnostic trigger time
loopback interface configuration

Imported Objects

From CLAB-DEF-MIB

clabProjDocsis

OBJECT-IDENTITY

From IF-MIB

InterfaceIndex

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Integer32
MODULE-IDENTITY
OBJECT-TYPE
Unsigned32

From SNMPv2-TC

TimeStamp
TruthValue

OIDs

OID symbolic	OID numeric	Type	Access	Description
sledMib	1.3.6.1.4.1.4491.2.1.13			This MIB module provides the management objects necessary to configure and invoke the Software Loopback Application for eDOCSIS (SLED) functionality. Copyright 1999-2007 Cable Television Laboratories, Inc. All rights reserved.
sledNotifications	1.3.6.1.4.1.4491.2.1.13.0
sledMibObjects	1.3.6.1.4.1.4491.2.1.13.1
sledGlobal	1.3.6.1.4.1.4491.2.1.13.1.1
T/F sledGlobalEnable	1.3.6.1.4.1.4491.2.1.13.1.1.1	TruthValue	read-write	This object allows the SLED functionality to be enabled/disabled. This object may only be updated prior to device registration. If the device has completed registration, any attempt to update the value of this object returns 'notWritable'. Prior to registration, if the value of this object is set to 'true', the SLED functionality is enabled and access to this MIB is allowed. Prior to registration, if the value of this object is set to 'false', the SLED functionality is disabled and any attempt to update other objects in this MIB returns 'noAccess'.
sledLoopback	1.3.6.1.4.1.4491.2.1.13.1.2
NUM sledLoopbackInterface	1.3.6.1.4.1.4491.2.1.13.1.2.1	InterfaceIndex	read-write	The index of the logical CPE interface (LCI) that the SLED loopback function is attached to. If the index does not correspond to a LCI supported by this device, 'wrongValue' is returned. Any attempt to set this object while sledLoopbackEnable is set to 'true' returns'notWritable'.
T/F sledLoopbackEnable	1.3.6.1.4.1.4491.2.1.13.1.2.2	TruthValue	read-write	Setting this object to 'true' enables the loopback function. Setting this object to 'false' disables the loopback function. When enabled, the eCM removes the Ethernet FCS/CRC32 from the original packets. All Ethernet packets received by the SLED from the LCI are then processed as follows: 1. If the received Ethernet packet is greater than 1472 octets, the Ethernet packet is split into two fragments, the first consisting of the first 1472 octets of the Ethernet packet and the second containing the remaining octets, resulting in two payloads that are processed as described below. If the received Ethernet packet is less than or equal to 1472 octets, the entire packet will be processed as a single payload. 2. For each payload generated in step 1, the payload is appended to the contents of sledLoopbackPktHdr. 3. The mutable fields within sledLoopbackPktHdr MUST be recomputed. The mutable fields are IP Header Checksum, IP Total Length, UDP Checksum, and UDP Length. 4. If the Ethernet packet was fragmented in step 1, the appropriate IP header fields (Flags and Fragment Offset) are updated to indicate IP fragmentation These IP fragmentation header values will differ depending on if this is the first or second fragment being processed. 5. The Ethernet FCS is computed and appended. 6. The resulting Ethernet packet is transmitted to the LCI.
OCT sledLoopbackPktHdr	1.3.6.1.4.1.4491.2.1.13.1.2.3	OCTET STRING	read-write	A properly formatted Ethernet(DIX)+IP+UDP headers for use in SLED loopback processing as described in sledLoopbackEnable. The object value contains mutable fields that are recomputed: the IP Header Checksum, IP Total Length, UDP Length, and UDP Checksum. Any attempt to set this object while sledLoopbackEnable is set to 'true' returns 'notWritable'.
sledPktGen	1.3.6.1.4.1.4491.2.1.13.1.3
NUM sledPktGenInterface	1.3.6.1.4.1.4491.2.1.13.1.3.1	InterfaceIndex	read-write	The index of the logical CPE interface (LCI) that the SLED packet generation function is attached to. If the index does not correspond to a LCI supported by the device, 'wrongValue' is returned. Any attempt to set this object while sledPktGenTrigger is set to 'start' returns 'notWritable'.
OCT sledPktGenPayload	1.3.6.1.4.1.4491.2.1.13.1.3.2	OCTET STRING	read-write	The properly formatted Ethernet packet payload to be generated. Any attempt to set this object while sledPktGenTrigger is set to 'start' returns 'notWritable'.
U32 sledPktGenRate	1.3.6.1.4.1.4491.2.1.13.1.3.3	Unsigned32	read-write	The packet rate (in packets per second) that the SLED is to transmit the packet specified in the sledPktGenPayload. Any attempt to set this object while sledPktGenTrigger is set to 'start' returns 'notWritable'.
U32 sledPktGenNumPkts	1.3.6.1.4.1.4491.2.1.13.1.3.4	Unsigned32	read-write	Number of packets to be generated at the rate specified by sledPktGenRate. Any attempt to set this object while sledPktGenTrigger has been set to 'start' will return 'notWritable'.
INT sledPktGenTrigger	1.3.6.1.4.1.4491.2.1.13.1.3.5	INTEGER	read-write	This object controls the packet generation. Setting this object to 'start' causes the packet generation to begin. Reading this object will return 'start' if a packet generation is in progress, otherwise it will return 'stop'. Setting this object to 'stop' while packet generation is in progress aborts the packet generation. Setting this object to 'start' while packet generation is in progress, 'wrongValue' is returned.
TIM sledPktGenLastTrigger	1.3.6.1.4.1.4491.2.1.13.1.3.6	TimeStamp	read-only	Value of sysUptime when the packet generation was last triggered.
sledMibNotificationsObjects	1.3.6.1.4.1.4491.2.1.13.2
sledMibConformance	1.3.6.1.4.1.4491.2.1.13.3
sledMibCompliances	1.3.6.1.4.1.4491.2.1.13.3.1
sledMibCompliance	1.3.6.1.4.1.4491.2.1.13.3.1.1			The compliance statement for SLED.
sledMibGroups	1.3.6.1.4.1.4491.2.1.13.3.2
sledMibBaseGroup	1.3.6.1.4.1.4491.2.1.13.3.2.1			Group of object in SLED MIB.

RFC description

Vendor-private MIB for managing System Logging and Event Distribution on network devices; used for centralized log and event collection.

Start monitoring eDOCSIS-embedded cable device, e.g. cable modem/eMTA with embedded application (loopback diagnostic test config) 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 SLED-MIB

What Is SLED-MIB?

Supported Devices

Monitoring Examples

What Can Be Monitored

This MIB depends on

RFC description