entPhysicalContainedIn.11 == 8
entPhysicalClass.11 == port(10)
entPhysicalParentRelPos.11 == 3
entPhysicalName.11 == 'Ethernet B'
Logical entities -- entLogicalTable
2 OSPF instances:
entLogicalDescr.1 == "Acme OSPF v1.1"
entLogicalType.1 == ospf
entLogicalCommunity.1 == "public-ospf1"
entLogicalTAddress.1 == 124.125.126.127:161
entLogicalTDomain.1 == snmpUDPDomain
entLogicalDescr.2 == "Acme OSPF v1.1"
entLogicalType.2 == ospf
entLogicalCommunity.2 == "public-ospf2"
entLogicalTAddress.2 == 124.125.126.127:161
entLogicalTDomain.2 == snmpUDPDomain
2 logical bridges:
entLogicalDescr.3 == "Acme Bridge v2.1.1"
entLogicalType.3 == dod1dBridge
entLogicalCommunity.3 == "public-bridge1"
entLogicalTAddress.3 == 124.125.126.127:161
entLogicalTDomain.3 == snmpUDPDomain
entLogicalDescr.4 == "Acme Bridge v2.1.1"
entLogicalType.4 == dod1dBridge
entLogicalCommunity.4 == "public-bridge2"
entLogicalTAddress.4 == 124.125.126.127:161
entLogicalTDomain.4 == snmpUDPDomain
Logical to Physical Mappings:
1st OSPF instance: uses module 1-port 1
entLPPhysicalIndex.1.5 == 5
2nd OSPF instance: uses module 2-port 1
entLPPhysicalIndex.2.9 == 9
1st bridge group: uses module 1, all ports
[ed. -- Note that these mappings are included in the table since
another logical entity (1st OSPF) utilizes one of the
ports. If this were not the case, then a single mapping
to the module (e.g. entLPPhysicalIndex.3.4) would be
present instead. ]
entLPPhysicalIndex.3.5 == 5
entLPPhysicalIndex.3.6 == 6
entLPPhysicalIndex.3.7 == 7
2nd bridge group: uses module 2, all ports
entLPPhysicalIndex.4.9 == 9
entLPPhysicalIndex.4.10 == 10
entLPPhysicalIndex.4.11 == 11
Physical to Logical to MIB Alias Mappings -- entAliasMappingTable:
Example 1: ifIndex values are global to all logical entities
entAliasMappingIdentifier.5.0 == ifIndex.1
entAliasMappingIdentifier.6.0 == ifIndex.2
entAliasMappingIdentifier.7.0 == ifIndex.3
entAliasMappingIdentifier.9.0 == ifIndex.4
entAliasMappingIdentifier.10.0 == ifIndex.5
entAliasMappingIdentifier.11.0 == ifIndex.6
Example 2: ifIndex values are not shared by all logical entities
entAliasMappingIdentifier.5.0 == ifIndex.1
entAliasMappingIdentifier.5.3 == ifIndex.101
entAliasMappingIdentifier.6.0 == ifIndex.2
entAliasMappingIdentifier.6.3 == ifIndex.102
entAliasMappingIdentifier.7.0 == ifIndex.3
entAliasMappingIdentifier.7.3 == ifIndex.103
entAliasMappingIdentifier.9.0 == ifIndex.4
entAliasMappingIdentifier.9.3 == ifIndex.204
entAliasMappingIdentifier.10.0 == ifIndex.5
entAliasMappingIdentifier.10.3 == ifIndex.205
entAliasMappingIdentifier.11.0 == ifIndex.6
entAliasMappingIdentifier.11.3 == ifIndex.206
Physical Containment Tree -- entPhysicalContainsTable
chassis has two containers:
entPhysicalChildIndex.1.2 = 2
entPhysicalChildIndex.1.3 = 3
container 1 has a module:
entPhysicalChildIndex.2.4 = 4
container 2 has a module:
entPhysicalChildIndex.3.8 = 8
module 1 has 3 ports:
entPhysicalChildIndex.4.5 = 5
entPhysicalChildIndex.4.6 = 6
entPhysicalChildIndex.4.7 = 7
module 2 has 3 ports:
entPhysicalChildIndex.8.9 = 9
entPhysicalChildIndex.8.10 = 10
entPhysicalChildIndex.1.11 = 11
5.2. Repeaters
A 3-slot Hub with 2 backplane ethernet segments. Slot three is
empty, and the remaining slots contain ethernet repeater modules.
[ed. -- Note that a replacement for the current Repeater MIB (RFC
1516) is likely to emerge soon, and it will no longer be necessary to
access repeater MIB data in different naming scopes.]
Physical entities -- entPhysicalTable:
1 Field-replaceable physical chassis:
entPhysicalDescr.1 == "Acme Chassis Model 110"
entPhysicalVendorType.1 == acmeProducts.chassisTypes.2
entPhysicalContainedIn.1 == 0
entPhysicalClass.1 == chassis(3)
entPhysicalParentRelPos.1 == 0
entPhysicalName.1 == '110-B'
2 Chassis Ethernet Backplanes:
entPhysicalDescr.2 == "Acme Ethernet Backplane Type A"
entPhysicalVendorType.2 == acmeProducts.backplaneTypes.1
entPhysicalContainedIn.2 == 1
entPhysicalClass.2 == backplane(4)
entPhysicalParentRelPos.2 == 1
entPhysicalName.2 == 'B1'
entPhysicalDescr.3 == "Acme Ethernet Backplane Type A"
entPhysicalVendorType.3 == acmeProducts.backplaneTypes.1
entPhysicalContainedIn.3 == 1
entPhysicalClass.3 == backplane(4)
entPhysicalParentRelPos.3 == 2
entPhysicalName.3 == 'B2'
3 slots within the chassis:
entPhysicalDescr.4 == "Acme Hub Slot Type RB"
entPhysicalVendorType.4 == acmeProducts.slotTypes.5
entPhysicalContainedIn.4 == 1
entPhysicalClass.4 == container(5)
entPhysicalParentRelPos.4 == 1
entPhysicalName.4 == 'Slot 1'
entPhysicalDescr.5 == "Acme Hub Slot Type RB"
entPhysicalVendorType.5 == acmeProducts.slotTypes.5
entPhysicalContainedIn.5 == 1
entPhysicalClass.5 == container(5)
entPhysicalParentRelPos.5 == 2
entPhysicalName.5 == 'Slot 2'
entPhysicalDescr.6 == "Acme Hub Slot Type RB"
entPhysicalVendorType.6 == acmeProducts.slotTypes.5
entPhysicalContainedIn.6 == 1
entPhysicalClass.6 == container(5)
entPhysicalParentRelPos.6 == 3
entPhysicalName.6 == 'Slot 3'
Slot 1 contains a plug-in module with 4 10-BaseT ports:
entPhysicalDescr.7 == "Acme 10Base-T Module 114 Rev A"
entPhysicalVendorType.7 == acmeProducts.moduleTypes.32
entPhysicalContainedIn.7 == 4
entPhysicalClass.7 == module(9)
entPhysicalParentRelPos.7 == 1
entPhysicalName.7 == 'M1'
entPhysicalDescr.8 == "Acme 10Base-T Port RB Rev A"
entPhysicalVendorType.8 == acmeProducts.portTypes.10
entPhysicalContainedIn.8 == 7
entPhysicalClass.8 == port(10)
entPhysicalParentRelPos.8 == 1
entPhysicalName.8 == 'Ethernet-A'
entPhysicalDescr.9 == "Acme 10Base-T Port RB Rev A"
entPhysicalVendorType.9 == acmeProducts.portTypes.10
entPhysicalContainedIn.9 == 7
entPhysicalClass.9 == port(10)
entPhysicalParentRelPos.9 == 2
entPhysicalName.9 == 'Ethernet-B'
entPhysicalDescr.10 == "Acme 10Base-T Port RB Rev B"
entPhysicalVendorType.10 == acmeProducts.portTypes.10
entPhysicalContainedIn.10 == 7
entPhysicalClass.10 == port(10)
entPhysicalParentRelPos.10 == 3
entPhysicalName.10 == 'Ethernet-C'
entPhysicalDescr.11 == "Acme 10Base-T Port RB Rev B"
entPhysicalVendorType.11 == acmeProducts.portTypes.10
entPhysicalContainedIn.11 == 7
entPhysicalClass.11 == port(10)
entPhysicalParentRelPos.11 == 4
entPhysicalName.11 == 'Ethernet-D'
Slot 2 contains another ethernet module with 2 ports.
entPhysicalDescr.12 == "Acme 10Base-T Module Model 4 Rev A"
entPhysicalVendorType.12 == acmeProducts.moduleTypes.30
entPhysicalContainedIn.12 = 5
entPhysicalClass.12 == module(9)
entPhysicalParentRelPos.12 == 1
entPhysicalName.12 == 'M2'
entPhysicalDescr.13 == "Acme 802.3 AUI Port Rev A"
entPhysicalVendorType.13 == acmeProducts.portTypes.11
entPhysicalContainedIn.13 == 12
entPhysicalClass.13 == port(10)
entPhysicalParentRelPos.13 == 1
entPhysicalName.13 == 'AUI'
entPhysicalDescr.14 == "Acme 10Base-T Port RD Rev B"
entPhysicalVendorType.14 == acmeProducts.portTypes.14
entPhysicalContainedIn.14 == 12
entPhysicalClass.14 == port(10)
entPhysicalParentRelPos.14 == 2
entPhysicalName.14 == 'E2'
Logical entities -- entLogicalTable
Repeater 1--comprised of any ports attached to backplane 1
entLogicalDescr.1 == "Acme repeater v3.1"
entLogicalType.1 == snmpDot3RptrMgt
entLogicalCommunity.1 "public-repeater1"
entLogicalTAddress.1 == 124.125.126.127:161
entLogicalTDomain.1 == snmpUDPDomain
Repeater 2--comprised of any ports attached to backplane 2:
entLogicalDescr.2 == "Acme repeater v3.1"
entLogicalType.2 == snmpDot3RptrMgt
entLogicalCommunity.2 == "public-repeater2"
entLogicalTAddress.2 == 124.125.126.127:161
entLogicalTDomain.2 == snmpUDPDomain
Logical to Physical Mappings -- entLPMappingTable:
repeater1 uses backplane 1, slot 1-ports 1 & 2, slot 2-port 1
[ed. -- Note that a mapping to the module is not included,
since in this example represents a port-switchable hub.
Even though all ports on the module could belong to the
same repeater as a matter of configuration, the LP port
mappings should not be replaced dynamically with a single
mapping for the module (e.g. entLPPhysicalIndex.1.7).
If all ports on the module shared a single backplane connection,
then a single mapping for the module would be more appropriate. ]
entLPPhysicalIndex.1.2 == 2
entLPPhysicalIndex.1.8 == 8
entLPPhysicalIndex.1.9 == 9
entLPPhysicalIndex.1.13 == 13
repeater2 uses backplane 2, slot 1-ports 3 & 4, slot 2-port 2
entLPPhysicalIndex.2.3 == 3
entLPPhysicalIndex.2.10 == 10
entLPPhysicalIndex.2.11 == 11
entLPPhysicalIndex.2.14 == 14
Physical to Logical to MIB Alias Mappings -- entAliasMappingTable:
Repeater Port Identifier values are shared by both repeaters:
entAliasMappingIdentifier.8.0 == rptrPortGroupIndex.1.1
entAliasMappingIdentifier.9.0 == rptrPortGroupIndex.1.2
entAliasMappingIdentifier.10.0 == rptrPortGroupIndex.1.3
entAliasMappingIdentifier.11.0 == rptrPortGroupIndex.1.4
entAliasMappingIdentifier.13.0 == rptrPortGroupIndex.2.1
entAliasMappingIdentifier.14.0 == rptrPortGroupIndex.2.2
Physical Containment Tree -- entPhysicalContainsTable
chassis has two backplanes and three containers:
entPhysicalChildIndex.1.2 = 2
entPhysicalChildIndex.1.3 = 3
entPhysicalChildIndex.1.4 = 4
entPhysicalChildIndex.1.5 = 5
entPhysicalChildIndex.1.6 = 6
container 1 has a module:
entPhysicalChildIndex.4.7 = 7
container 2 has a module
entPhysicalChildIndex.5.12 = 12
[ed. - in this example, container 3 is empty.]
module 1 has 4 ports:
entPhysicalChildIndex.7.8 = 8
entPhysicalChildIndex.7.9 = 9
entPhysicalChildIndex.7.10 = 10
entPhysicalChildIndex.7.11 = 11
module 2 has 2 ports:
entPhysicalChildIndex.12.13 = 13
entPhysicalChildIndex.12.14 = 14
6. Acknowledgements
This document was produced by the IETF Entity MIB Working Group.
7. References
[1] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
S. Waldbusser, "Structure of Management Information for version 2
of the Simple Network Management Protocol (SNMPv2)", RFC1902,
January 1996.
[2] McCloghrie, K., and M. Rose, Editors, "Management Information Base
for Network Management of TCP/IP-based internets: MIB-II", STD 17,
RFC1213, Hughes LAN Systems, Performance Systems International,
March 1991.
[3] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
S. Waldbusser, "Textual Conventions for version 2 of the Simple
Network Management Protocol (SNMPv2)", RFC1903, January 1996.
[4] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
S. Waldbusser, "Protocol Operations for version 2 of the Simple
Network Management Protocol (SNMPv2)", RFC1905, January 1996.
[5] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
S. Waldbusser, "Conformance Statements for version 2 of the Simple
Network Management Protocol (SNMPv2)", RFC1904, January 1996.
[6] Case, J., M. Fedor, M. Schoffstall, J. Davin, "Simple Network
Management Protocol", RFC1157, SNMP Research, Performance Systems
International, MIT Laboratory for Computer Science, May 1990.
[7] McCloghrie, K., and Kastenholtz, F., "Interfaces Group Evolution",
RFC1573, Hughes LAN Systems, FTP Software, January 1994.
[8] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
S. Waldbusser, "Transport Mappings for version 2 of the Simple
Network Management Protocol (SNMPv2)", RFC1906, January 1996.
[9] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M., and
S. Waldbusser, "Introduction to Community-based SNMPv2", RFC1901,
January 1996.
8. Security Considerations
In order to implement this MIB, an agent must make certain management
information available about various logical and physical entities
within a managed system, which may be considered sensitive in some
network environments.
Therefore, a network administrator may wish to employ instance-level
access control, and configure the Entity MIB access (i.e., community
strings in SNMPv1 and SNMPv2C), such that certain instances within
this MIB (e.g., entLogicalCommunity, or entire entLogicalEntries,
entPhysicalEntries, and associated mapping table entries), are
excluded from particular MIB views.
9. Authors' Addresses
Keith McCloghrie
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134
Phone: 408-526-5260
EMail: kzm@cisco.com
Andy Bierman
Cisco Systems, Inc.
170 West Tasman Drive
San Jose, CA 95134
Phone: 408-527-3711
EMail: abierman@cisco.com