-- Network Working Group F. Baker
-- Request For Comments: 1354 ACC
-- July 1992
--
--
-- IP Forwarding Table MIB
--RFC1354-MIB DEFINITIONS::=BEGINIMPORTSGauge,IpAddressFROM RFC1155-SMI
mib-2, ip
FROM RFC1213-MIB
OBJECT-TYPEFROM RFC-1212;-- This MIB module uses the extended OBJECT-TYPE macro as-- defined in [9].ipForward OBJECTIDENTIFIER::={ ip 24}ipForwardNumber OBJECT-TYPESYNTAXGaugeACCESSread-onlySTATUSmandatoryDESCRIPTION"The number of current ipForwardTable entries
that are not invalid."::={ ipForward 1}-- IP Forwarding Table-- The IP Forwarding Table obsoletes and replaces the ipRoute-- Table current in MIB-I and MIB-II. It adds knowledge of-- the autonomous system of the next hop, multiple next hop-- support, and policy routing support.ipForwardTable OBJECT-TYPESYNTAXSEQUENCEOF IpForwardEntry
ACCESSnot-accessibleSTATUSmandatoryDESCRIPTION"This entity's IP Routing table."REFERENCE"RFC 1213 Section 6.6, The IP Group"::={ ipForward 2}ipForwardEntry OBJECT-TYPESYNTAX IpForwardEntry
ACCESSnot-accessibleSTATUSmandatoryDESCRIPTION"A particular route to a particular destina-
tion, under a particular policy."INDEX{
ipForwardDest,
ipForwardProto,
ipForwardPolicy,
ipForwardNextHop
}::={ ipForwardTable 1}
IpForwardEntry ::=SEQUENCE{
ipForwardDest
IpAddress,
ipForwardMask
IpAddress,
ipForwardPolicy
INTEGER,
ipForwardNextHop
IpAddress,
ipForwardIfIndex
INTEGER,
ipForwardType
INTEGER,
ipForwardProto
INTEGER,
ipForwardAge
INTEGER,
ipForwardInfo
OBJECTIDENTIFIER,
ipForwardNextHopAS
INTEGER,
ipForwardMetric1
INTEGER,
ipForwardMetric2
INTEGER,
ipForwardMetric3
INTEGER,
ipForwardMetric4
INTEGER,
ipForwardMetric5
INTEGER}ipForwardDest OBJECT-TYPESYNTAXIpAddressACCESSread-onlySTATUSmandatory
DESCRIPTION"The destination IP address of this route. An
entry with a value of 0.0.0.0 is considered a
default route.
This object may not take a Multicast (Class D)
address value.
Any assignment (implicit or otherwise) of an
instance of this object to a value x must be
rejected if the bitwise logical-AND of x with
the value of the corresponding instance of the
ipForwardMask object is not equal to x."::={ ipForwardEntry 1}ipForwardMask OBJECT-TYPESYNTAXIpAddressACCESSread-writeSTATUSmandatoryDESCRIPTION"Indicate the mask to be logical-ANDed with the
destination address before being compared to
the value in the ipForwardDest field. For
those systems that do not support arbitrary
subnet masks, an agent constructs the value of
the ipForwardMask by reference to the IP Ad-
dress Class.
Any assignment (implicit or otherwise) of an
instance of this object to a value x must be
rejected if the bitwise logical-AND of x with
the value of the corresponding instance of the
ipForwardDest object is not equal to ipForward-
Dest."DEFVAL{ '00000000'h }-- 0.0.0.0::={ ipForwardEntry 2}-- The following convention is included for specification-- of TOS Field contents. At this time, the Host Requirements-- and the Router Requirements documents disagree on the width-- of the TOS field. This mapping describes the Router-- Requirements mapping, and leaves room to widen the TOS field-- without impact to fielded systems.ipForwardPolicy OBJECT-TYPESYNTAXINTEGERACCESSread-onlySTATUSmandatoryDESCRIPTION"The general set of conditions that would cause
the selection of one multipath route (set of
next hops for a given destination) is referred
to as 'policy'.
Unless the mechanism indicated by ipForwardPro-
to specifies otherwise, the policy specifier is
the IP TOS Field. The encoding of IP TOS is as
specified by the following convention. Zero
indicates the default path if no more specific
policy applies.
+-----+-----+-----+-----+-----+-----+-----+-----+
| | | |
| PRECEDENCE | TYPE OF SERVICE | 0 |
| | | |
+-----+-----+-----+-----+-----+-----+-----+-----+
IP TOS IP TOS
Field Policy Field Policy
Contents Code Contents Code
0 0 0 0 ==> 0 0 0 0 1 ==> 2
0 0 1 0 ==> 4 0 0 1 1 ==> 6
0 1 0 0 ==> 8 0 1 0 1 ==> 10
0 1 1 0 ==> 12 0 1 1 1 ==> 14
1 0 0 0 ==> 16 1 0 0 1 ==> 18
1 0 1 0 ==> 20 1 0 1 1 ==> 22
1 1 0 0 ==> 24 1 1 0 1 ==> 26
1 1 1 0 ==> 28 1 1 1 1 ==> 30
Protocols defining 'policy' otherwise must ei-
ther define a set of values which are valid for
this object or must implement an integer-
instanced policy table for which this object's
value acts as an index."::={ ipForwardEntry 3}ipForwardNextHop OBJECT-TYPESYNTAXIpAddressACCESSread-only
STATUSmandatoryDESCRIPTION"On remote routes, the address of the next sys-
tem en route; Otherwise, 0.0.0.0."::={ ipForwardEntry 4}ipForwardIfIndex OBJECT-TYPESYNTAXINTEGERACCESSread-writeSTATUSmandatoryDESCRIPTION"The ifIndex value which identifies the local
interface through which the next hop of this
route should be reached."DEFVAL{0}::={ ipForwardEntry 5}ipForwardType OBJECT-TYPESYNTAXINTEGER{other (1),-- not specified by this MIBinvalid (2),-- logically deletedlocal (3),-- local interface
remote (4)-- remote destination}ACCESSread-writeSTATUSmandatoryDESCRIPTION"The type of route. Note that local(3) refers
to a route for which the next hop is the final
destination; remote(4) refers to a route for
which the next hop is not the final destina-
tion.
Setting this object to the value invalid(2) has
the effect of invalidating the corresponding
entry in the ipForwardTable object. That is,
it effectively disassociates the destination
identified with said entry from the route iden-
tified with said entry. It is an
implementation-specific matter as to whether
the agent removes an invalidated entry from the
table. Accordingly, management stations must
be prepared to receive tabular information from
agents that corresponds to entries not current-
ly in use. Proper interpretation of such en-
tries requires examination of the relevant ip-
ForwardType object."DEFVAL{ invalid }::={ ipForwardEntry 6}
ipForwardProto OBJECT-TYPESYNTAXINTEGER{other (1),-- not specifiedlocal (2),-- local interfacenetmgmt (3),-- static routeicmp (4),-- result of ICMP Redirect-- the following are all dynamic-- routing protocolsegp (5),-- Exterior Gateway Protocolggp (6),-- Gateway-Gateway Protocolhello (7),-- FuzzBall HelloSpeakrip (8),-- Berkeley RIP or RIP-II
is-is (9),-- Dual IS-ISes-is (10),-- ISO 9542ciscoIgrp (11),-- Cisco IGRPbbnSpfIgp (12),-- BBN SPF IGPospf (13),-- Open Shortest Path Firstbgp (14),-- Border Gateway Protocolidpr (15)-- InterDomain Policy Routing}ACCESSread-onlySTATUSmandatoryDESCRIPTION"The routing mechanism via which this route was
learned. Inclusion of values for gateway rout-
ing protocols is not intended to imply that
hosts should support those protocols."::={ ipForwardEntry 7}
ipForwardAge OBJECT-TYPESYNTAXINTEGERACCESSread-onlySTATUSmandatoryDESCRIPTION"The number of seconds since this route was
last updated or otherwise determined to be
correct. Note that no semantics of `too old'
can be implied except through knowledge of the
routing protocol by which the route was
learned."DEFVAL{0}::={ ipForwardEntry 8}ipForwardInfo OBJECT-TYPESYNTAXOBJECTIDENTIFIERACCESSread-writeSTATUSmandatoryDESCRIPTION"A reference to MIB definitions specific to the
particular routing protocol which is responsi-
ble for this route, as determined by the value
specified in the route's ipForwardProto value.
If this information is not present, its value
should be set to the OBJECT IDENTIFIER { 0 0 },
which is a syntactically valid object identif-
ier, and any implementation conforming to ASN.1
and the Basic Encoding Rules must be able to
generate and recognize this value."DEFVAL{{00}}-- 0.0::={ ipForwardEntry 9}ipForwardNextHopAS OBJECT-TYPESYNTAXINTEGERACCESSread-writeSTATUSmandatoryDESCRIPTION"The Autonomous System Number of the Next Hop.
When this is unknown or not relevant to the
protocol indicated by ipForwardProto, zero."DEFVAL{0}::={ ipForwardEntry 10}ipForwardMetric1 OBJECT-TYPESYNTAXINTEGERACCESSread-writeSTATUSmandatory
DESCRIPTION"The primary routing metric for this route.
The semantics of this metric are determined by
the routing-protocol specified in the route's
ipForwardProto value. If this metric is not
used, its value should be set to -1."DEFVAL{-1}::={ ipForwardEntry 11}ipForwardMetric2 OBJECT-TYPESYNTAXINTEGERACCESSread-writeSTATUSmandatoryDESCRIPTION"An alternate routing metric for this route.
The semantics of this metric are determined by
the routing-protocol specified in the route's
ipForwardProto value. If this metric is not
used, its value should be set to -1."DEFVAL{-1}::={ ipForwardEntry 12}ipForwardMetric3 OBJECT-TYPESYNTAXINTEGER
ACCESSread-writeSTATUSmandatoryDESCRIPTION"An alternate routing metric for this route.
The semantics of this metric are determined by
the routing-protocol specified in the route's
ipForwardProto value. If this metric is not
used, its value should be set to -1."DEFVAL{-1}::={ ipForwardEntry 13}ipForwardMetric4 OBJECT-TYPESYNTAXINTEGERACCESSread-writeSTATUSmandatoryDESCRIPTION"An alternate routing metric for this route.
The semantics of this metric are determined by
the routing-protocol specified in the route's
ipForwardProto value. If this metric is not
used, its value should be set to -1."DEFVAL{-1}::={ ipForwardEntry 14}
ipForwardMetric5 OBJECT-TYPESYNTAXINTEGERACCESSread-writeSTATUSmandatoryDESCRIPTION"An alternate routing metric for this route.
The semantics of this metric are determined by
the routing-protocol specified in the route's
ipForwardProto value. If this metric is not
used, its value should be set to -1."DEFVAL{-1}::={ ipForwardEntry 15}END