BAS-ALIAS-IP-MIB

All MIBs › BAS-ALIAS-IP-MIB

Organization: Broadband Access Systems

Last Updated: 1998-10-08

Category: DOCSIS and Cable

Description: Manages IP address alias configuration and routing objects on the Broadband Access Systems CMTS platform.

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What Is BAS-ALIAS-IP-MIB?

BAS-ALIAS-IP-MIB is a vendor-specific module for Broadband Access Systems (BAS) CMTS cable broadband platforms, defining IP alias addressing and IP-layer statistics for a chassis cluster. It exposes per-alias IP configuration such as forwarding mode and default TTL, alongside IP-layer performance counters including inbound receives, header/address errors, discards, forwarded datagrams, and ICMP-related counters. As primarily a traffic/performance counter MIB, rising basIpInHdrErrors, basIpInAddrErrors, or basIpInDiscards act as a software-health indicator, flagging malformed traffic or misconfiguration on the CMTS's routing stack. It closely parallels the standard IP-MIB (RFC 1213 ipGroup) structure, adapted for CMTS alias addressing. It is typically deployed in cable operator head-ends managing DOCSIS CMTS chassis clusters. Engineers can download the BAS-ALIAS-IP-MIB file directly to load it into their MIB browser.

IPNetwork Monitor allows you to monitor SNMP objects defined in BAS-ALIAS-IP-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

Broadband Access Systems CMTS chassis cluster
cable broadband head-end router

Monitoring Examples

An operator would monitor basIpInReceives against basIpInDiscards and basIpInHdrErrors on basIpTable/basIpEntry for a given alias to spot a spike in malformed packets pointing at a misbehaving cable modem or upstream noise. basIpForwDatagrams and basIpOutRequests give visibility into forwarding load on the alias interface, while basIpInUnknownProtos and the basIcmp counters flag unexpected protocol traffic or ICMP errors on the same alias.

What Can Be Monitored

IP alias configuration/forwarding mode
IP forwarding statistics
inbound packet errors/discards
forwarded datagram counts
ICMP error statistics

Imported Objects

From BAS-MIB

BasChassisId
BasInterfaceId
BasLogicalPortId
BasSlotId
basAliasIp	OBJECT-IDENTITY

From SNMPv2-SMI

Counter32
Integer32
MODULE-IDENTITY
OBJECT-TYPE

How to Use in IPNetwork Monitor

Example using basIpInReceives OID:

Select a Broadband Access Systems CMTS 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 basIpInReceives into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. The total number of input datagrams received from interfaces, including those received in error. 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

OID symbolic	OID numeric	Type	Access	Description
basAliasIpMib	1.3.6.1.4.1.3493.2.7.2.1			This MIB module defines the Alias IP MIB objects for a Broadband Access System Cluster.
basIcmp	1.3.6.1.4.1.3493.2.7.2.1.2
BAS basIcmpChassis	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.27	BasChassisId	not-accessible	The BAS Chassis ID of this card.
basIcmpEntry	1.3.6.1.4.1.3493.2.7.2.1.2.1.1		not-accessible	ICMP objects for a Chassis Stack.
NUM basIcmpIf	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.29	BasInterfaceId	not-accessible	The BAS interface ID of this card.
C32 basIcmpInAddrMaskReps	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.13	Counter32	read-only	The number of ICMP Address Mask Reply messages received.
C32 basIcmpInAddrMasks	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.12	Counter32	read-only	The number of ICMP Address Mask Request messages received.
C32 basIcmpInDestUnreachs	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.3	Counter32	read-only	The number of ICMP Destination Unreachable messages received.
C32 basIcmpInEchoReps	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.9	Counter32	read-only	The number of ICMP Echo Reply messages received.
C32 basIcmpInEchos	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.8	Counter32	read-only	The number of ICMP Echo (request) messages received.
C32 basIcmpInErrors	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.2	Counter32	read-only	The number of ICMP messages which the entity received but determined as having ICMP-specific errors (bad ICMP checksums, bad length, etc.).
C32 basIcmpInMsgs	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.1	Counter32	read-only	The total number of ICMP messages which the entity received. Note that this counter includes all those counted by icmpInErrors.
C32 basIcmpInParmProbs	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.5	Counter32	read-only	The number of ICMP Parameter Problem messages received.
C32 basIcmpInRedirects	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.7	Counter32	read-only	The number of ICMP Redirect messages received.
C32 basIcmpInSrcQuenchs	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.6	Counter32	read-only	The number of ICMP Source Quench messages received.
C32 basIcmpInTimeExcds	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.4	Counter32	read-only	The number of ICMP Time Exceeded messages received.
C32 basIcmpInTimestampReps	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.11	Counter32	read-only	The number of ICMP Timestamp Reply messages received.
C32 basIcmpInTimestamps	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.10	Counter32	read-only	The number of ICMP Timestamp (request) messages received.
BAS basIcmpLPort	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.30	BasLogicalPortId	not-accessible	The BAS logical port ID of this card.
C32 basIcmpOutAddrMaskReps	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.26	Counter32	read-only	The number of ICMP Address Mask Reply messages sent.
C32 basIcmpOutAddrMasks	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.25	Counter32	read-only	The number of ICMP Address Mask Request messages sent.
C32 basIcmpOutDestUnreachs	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.16	Counter32	read-only	The number of ICMP Destination Unreachable messages sent.
C32 basIcmpOutEchoReps	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.22	Counter32	read-only	The number of ICMP Echo Reply messages sent.
C32 basIcmpOutEchos	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.21	Counter32	read-only	The number of ICMP Echo (request) messages sent.
C32 basIcmpOutErrors	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.15	Counter32	read-only	The number of ICMP messages which this entity did not send due to problems discovered within ICMP such as a lack of buffers. This value should not include errors discovered outside the ICMP layer such as the inability of IP to route the resultant datagram. In some implementations there may be no types of error which contribute to this counter's value.
C32 basIcmpOutMsgs	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.14	Counter32	read-only	The total number of ICMP messages which this entity attempted to send. Note that this counter includes all those counted by icmpOutErrors.
C32 basIcmpOutParmProbs	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.18	Counter32	read-only	The number of ICMP Parameter Problem messages sent.
C32 basIcmpOutRedirects	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.20	Counter32	read-only	The number of ICMP Redirect messages sent. For a host, this object will always be zero, since hosts do not send redirects.
C32 basIcmpOutSrcQuenchs	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.19	Counter32	read-only	The number of ICMP Source Quench messages sent.
C32 basIcmpOutTimeExcds	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.17	Counter32	read-only	The number of ICMP Time Exceeded messages sent.
C32 basIcmpOutTimestampReps	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.24	Counter32	read-only	The number of ICMP Timestamp Reply messages sent.
C32 basIcmpOutTimestamps	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.23	Counter32	read-only	The number of ICMP Timestamp (request) messages sent.
BAS basIcmpSlot	1.3.6.1.4.1.3493.2.7.2.1.2.1.1.28	BasSlotId	not-accessible	The BAS Slot ID of this card.
basIcmpTable	1.3.6.1.4.1.3493.2.7.2.1.2.1		not-accessible	Per Chassis Stack ICMP objects.
basIpAlias	1.3.6.1.4.1.3493.2.7.2.1.1
BAS basIpChassis	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.20	BasChassisId	not-accessible	The BAS Chassis ID of this card.
INT basIpDefaultTTL	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.2	INTEGER	read-write	The default value inserted into the Time-To-Live field of the IP header of datagrams originated at this entity, whenever a TTL value is not supplied by the transport layer protocol.
basIpEntry	1.3.6.1.4.1.3493.2.7.2.1.1.1.1		not-accessible	IP objects for a Chassis Stack.
INT basIpForwarding	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.1	INTEGER	read-write	The indication of whether this entity is acting as an IP router in respect to the forwarding of datagrams received by, but not addressed to, this entity. IP routers forward datagrams. IP hosts do not (except those source-routed via the host).
C32 basIpForwDatagrams	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.6	Counter32	read-only	The number of input datagrams for which this entity was not their final IP destination, as a result of which an attempt was made to find a route to forward them to that final destination. In entities which do not act as IP routers, this counter will include only those packets which were Source-Routed via this entity, and the Source-Route option processing was successful.
C32 basIpFragCreates	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.19	Counter32	read-only	The number of IP datagram fragments that have been generated as a result of fragmentation at this entity.
C32 basIpFragFails	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.18	Counter32	read-only	The number of IP datagrams that have been discarded because they needed to be fragmented at this entity but could not be, e.g., because their Don't Fragment flag was set.
C32 basIpFragOKs	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.17	Counter32	read-only	The number of IP datagrams that have been successfully fragmented at this entity.
NUM basIpIf	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.22	BasInterfaceId	not-accessible	The BAS interface ID of this card.
C32 basIpInAddrErrors	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.5	Counter32	read-only	The number of input datagrams discarded because the IP address in their IP header's destination field was not a valid address to be received at this entity. This count includes invalid addresses (e.g., 0.0.0.0) and addresses of unsupported Classes (e.g., Class E). For entities which are not IP routers and therefore do not forward datagrams, this counter includes datagrams discarded because the destination address was not a local address.
C32 basIpInDelivers	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.9	Counter32	read-only	The total number of input datagrams successfully delivered to IP user-protocols (including ICMP).
C32 basIpInDiscards	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.8	Counter32	read-only	The number of input IP datagrams for which no problems were encountered to prevent their continued processing, but which were discarded (e.g., for lack of buffer space). Note that this counter does not include any datagrams discarded while awaiting re-assembly.
C32 basIpInHdrErrors	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.4	Counter32	read-only	The number of input datagrams discarded due to errors in their IP headers, including bad checksums, version number mismatch, other format errors, time-to-live exceeded, errors discovered in processing their IP options, etc.
C32 basIpInReceivesEx	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.3	Counter32	read-only	The total number of input datagrams received from interfaces, including those received in error.
C32 basIpInUnknownProtos	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.7	Counter32	read-only	The number of locally-addressed datagrams received successfully but discarded because of an unknown or unsupported protocol.
BAS basIpLPort	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.23	BasLogicalPortId	not-accessible	The BAS logical port ID of this card.
C32 basIpOutDiscards	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.11	Counter32	read-only	The number of output IP datagrams for which no problem was encountered to prevent their transmission to their destination, but which were discarded (e.g., for lack of buffer space). Note that this counter would include datagrams counted in ipForwDatagrams if any such packets met this (discretionary) discard criterion.
C32 basIpOutNoRoutes	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.12	Counter32	read-only	The number of IP datagrams discarded because no route could be found to transmit them to their destination. Note that this counter includes any packets counted in ipForwDatagrams which meet this `no-route' criterion. Note that this includes any datagrams which a host cannot route because all of its default routers are down.
C32 basIpOutRequests	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.10	Counter32	read-only	The total number of IP datagrams which local IP user- protocols (including ICMP) supplied to IP in requests for transmission. Note that this counter does not include any datagrams counted in ipForwDatagrams.
C32 basIpReasmFails	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.16	Counter32	read-only	The number of failures detected by the IP re-assembly algorithm (for whatever reason: timed out, errors, etc). Note that this is not necessarily a count of discarded IP fragments since some algorithms (notably the algorithm in RFC 815) can lose track of the number of fragments by combining them as they are received.
C32 basIpReasmOKs	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.15	Counter32	read-only	The number of IP datagrams successfully re-assembled.
C32 basIpReasmReqds	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.14	Counter32	read-only	The number of IP fragments received which needed to be reassembled at this entity.
I32 basIpReasmTimeout	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.13	Integer32	read-only	The maximum number of seconds which received fragments are held while they are awaiting reassembly at this entity.
BAS basIpSlot	1.3.6.1.4.1.3493.2.7.2.1.1.1.1.21	BasSlotId	not-accessible	The BAS Slot ID of this card.
basIpTable	1.3.6.1.4.1.3493.2.7.2.1.1.1		not-accessible	Per Chassis Stack IP objects.

RFC description

Provides IP protocol statistics and alias IP management for Broadband Access System chassis and logical port stacks.

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Download BAS-ALIAS-IP-MIB