DHCP-V4-RELAY-MIB

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Organization: IETF DHC Working Group General Discussion: dhcwg@ietf.org Subscribe: http://www1.ietf.org/mailman/listinfo/dhcwg Archive: http://www1.ietf.org/mailman/listinfo/dhcwg Chair: Ralph Droms, rdroms@cisco.com

Last Updated: 2004-02-09

Description: IETF MIB for managing and monitoring DHCPv4 relay agents implementing the BOOTP/DHCP relay function on network infrastructure devices

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What Is DHCP-V4-RELAY-MIB?

DHCP-V4-RELAY-MIB is a vendor-neutral IETF standards-track MIB (drafted for an RFC) that models entities implementing the BOOTP/DHCP relay agent function for IPv4. It exposes configuration and operational objects related to how a relay agent forwards DHCP client requests and server replies between network segments. In a monitoring context it is used to verify that the relay agent software on a router or switch is actively and correctly forwarding DHCP traffic, functioning as a software-status indicator for the relay service rather than exposing hardware health data. It is closely tied to the DHCP and BOOTP protocol standards themselves and is designed to be used alongside generic IETF interface and IP MIBs. It is typically deployed on routers, Layer 3 switches, or dedicated relay appliances that sit between DHCP clients and centralized DHCP servers across subnets. Engineers implementing or auditing this functionality typically reference the DHCP-V4-RELAY-MIB RFC/standard documentation for the authoritative specification.

IPNetwork Monitor allows you to monitor SNMP objects defined in DHCP-V4-RELAY-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

vendor-neutral, standards-based MIB, not tied to a specific manufacturer
routers and Layer 3 switches acting as DHCP/BOOTP relay agents

Monitoring Examples

No specific object or table names were provided in sample_objects for this module, so a concrete instance-level polling example cannot be grounded in real names. Based on the module description, an administrator would generally expect to poll relay agent statistics such as counts of forwarded requests/replies and per-interface relay configuration to confirm the DHCP relay service is functioning across VLANs or subnets. Because sample_objects is empty, the specific scalar and table names available in this MIB are not confirmed here.

Imported Objects

From INET-ADDRESS-MIB

InetAddressIPv4

From SNMP-FRAMEWORK-MIB

SnmpAdminString

From SNMPv2-CONF

MODULE-COMPLIANCE
NOTIFICATION-GROUP
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Counter64
Gauge32
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-IDENTITY
OBJECT-TYPE
Unsigned32
mib-2

From SNMPv2-TC

DateAndTime
RowStatus
TEXTUAL-CONVENTION

OIDs

OID symbolic	OID numeric	Type	Access	Description
dhcp	1.3.6.1.2.1.0
dhcpv4Relay	1.3.6.1.2.1.0.3			The MIB module for entities implementing the Relay Agent part of the Bootstrap Protocol (BOOTP) and the Dynamic Host Configuration protocol (DHCP) for Internet Protocol version 4(IPv4). Copyright (C) The Internet Society (2004). This version of this MIB module is part of RFC xxxx; see the RFC itself for full legal notices.
dhcpv4RelayObjects	1.3.6.1.2.1.0.3.1			DHCP Relay MIB identification objects are all defined in this branch.
dhcpv4RelaySystem	1.3.6.1.2.1.0.3.1.1			Group of objects that are related to the overall system.
STR dhcpv4RelaySystemDescr	1.3.6.1.2.1.0.3.1.1.1	SnmpAdminString	read-only	A textual description of the relay. This value should have the FQDN name.
OID dhcpv4RelaySystemObjectID	1.3.6.1.2.1.0.3.1.1.2	OBJECT IDENTIFIER	read-only	The vendor's authoritative identification of the network management subsystem contained in this entity. This value is allocated within the SMI enterprise subtree (1.3.6.1.4.1) and provides an easy and unambiguous means for determining what kind of relay is being managed. For example, if vendor Ohso Soft, Inc. is assigned the subtree 1.3.6.1.4.1.4242, it may assign the identifier 1.3.6.1.4.1.4242.1.1 to its Ursa DHCP Relay.
INT maxHopCountAllowed	1.3.6.1.2.1.0.3.1.1.3	INTEGER	read-write	The maximum hop count that a DHCP/BOOTP packet can have to pass through the relay
INT dhcpv4RelayandServer	1.3.6.1.2.1.0.3.1.1.4	INTEGER	read-write	The type of the Relay. The types are: (1) Acts only as DHCP Relay. (2) Acts as both as DHCP Relay and Server for independent networks
U32 seconds	1.3.6.1.2.1.0.3.1.1.5	Unsigned32	read-write	The time interval for which the relay chooses a server. In the subsequent seconds interval the relay chooses the next server in the list for relaying the packets from the clients.
relaySubnettoServerMapTable	1.3.6.1.2.1.0.3.1.1.6		read-write	The list of subnets that the relay manages. This table maps the subnets with a list of servers serving them along with the maximum seconds value the BOOTP/DHCP packet can have to make the relay to choose a server, beyond which the relay chooses the next server in the list. The server list will be an ordered list of preference.
relaySubnettoServerMapEntry	1.3.6.1.2.1.0.3.1.1.6.1		read-write	A logical row in the relaySubnettoServerMapEntry.
ADR clientSubnetID	1.3.6.1.2.1.0.3.1.1.6.1.1	InetAddressIPv4	read-write	The subnet address of the link on which the client resides
ADR serverAddress	1.3.6.1.2.1.0.3.1.1.6.1.2	InetAddressIPv4	read-write	The address of the DHCP/BOOTP server.
ROW relayNetToSerMapStatus	1.3.6.1.2.1.0.3.1.1.6.1.3	RowStatus	read-create	The status column used for creating, modifying, and deleting instances of the columnar objects in the relaySubnettoServerMapEntry table.
relayCounters	1.3.6.1.2.1.0.3.1.2			Group of objects that count various BOOTP Relay events.
C32 relayToServerCount	1.3.6.1.2.1.0.3.1.2.1	Counter32	read-only	The number of BOOTREQUEST packets that are relayed to the servers.
C32 relayToClientCount	1.3.6.1.2.1.0.3.1.2.2	Counter32	read-only	The number of BOOTREPLY packets that are relayed back to the clients
C32 relayCountInvalids	1.3.6.1.2.1.0.3.1.2.3	Counter32	read-only	The number of BOOTP packets dropped by the relay without forwarding (e.g., hop count exceeded the limit).
C32 giaddrSpoofCount	1.3.6.1.2.1.0.3.1.2.4	Counter32	read-only	Number of DHCP packets arrived with giaddr spoofed the relay's address
dhcpv4RAIFObjects	1.3.6.1.2.1.0.3.1.3			Objects that are associated with Relay Agent Information Option
INT dhcpv4RAIFOption	1.3.6.1.2.1.0.3.1.3.1	INTEGER	read-only	Enables/Disables addition of RAIF Option by the Relay. The values are: (1) Enables addition of RAIF Option by the Relay. (2) Disables addition of RAIF Option by the Relay.
INT maxPktSizeWithRAIFOption	1.3.6.1.2.1.0.3.1.3.2	INTEGER	read-write	Maximux size of a DHCP packet after including RAIF Option that is allowed to pass through the Relay
dhcpv4RAIFCounterObject	1.3.6.1.2.1.0.3.1.3.3
C32 sizeWithRAIFExceedLimitCount	1.3.6.1.2.1.0.3.1.3.3.1	Counter32	read-only	Number of DHCP packets exceeded the maximum size after including RAIF Option.
C32 relayOptionAddedCount	1.3.6.1.2.1.0.3.1.3.3.2	Counter32	read-only	Number of RAIF Option added by the relay while forwarding to the servers
C32 relayOptionRemovedCount	1.3.6.1.2.1.0.3.1.3.3.3	Counter32	read-only	Number of RAIF Option removed by the relay while forwarding to the clients
C32 incorrectRAIFOptionCount	1.3.6.1.2.1.0.3.1.3.3.4	Counter32	read-only	Number of incorrect RAIF Option in DHCP packet received by the relay
C32 docsisDCISubOptionAddedCount	1.3.6.1.2.1.0.3.1.3.3.5	Counter32	read-only	Number of DOCSIS-DCI SubOption added by the relay while forwarding to the servers
C32 docsisDCISubOptionRemoved	1.3.6.1.2.1.0.3.1.3.3.6	Counter32	read-only	Number of DOCSIS-DCI SubOption removed by the relay while forwarding to the servers
C32 linkSelSubOptionAddedCount	1.3.6.1.2.1.0.3.1.3.3.7	Counter32	read-only	Number of Link Selection SubOption added by the relay while forwarding to the servers
C32 linkSelSubOptionRemovedCount	1.3.6.1.2.1.0.3.1.3.3.8	Counter32	read-only	Number of Link Selection SubOption removed by the relay while forwarding to the servers

RFC description

DHCP IPv4 relay agent MIB for managing BOOTP and DHCP relay operations and statistics.

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Download DHCP-V4-RELAY-MIB

What Is DHCP-V4-RELAY-MIB?

Supported Devices

Monitoring Examples

This MIB depends on

Related MIBs

RFC description