>> MIB - Management Information Base

>> Table: ipRouteTable - (.1.3.6.1.2.1.4.21.1)

Description: A route to a particular destination.

ipRouteTable
OIDNameTypeAccess
.1DestIpAddressRW
.2IfIndexINTEGERRW
.3Metric1INTEGERRW
.4Metric2INTEGERRW
.5Metric3INTEGERRW
.6Metric4INTEGERRW
.7NextHopIpAddressRW
.8TypeENUMD
.9ProtoENUMR
.10AgeINTEGERRW
.11MaskIpAddressRW
.12Metric5INTEGERRW
.13InfoOBJECT IDENTIFIERR

Dest
The destination IP address of this route.  An
entry with a value of 0.0.0.0 is considered a
default route.  Multiple routes to a single
destination can appear in the table, but access to
such multiple entries is dependent on the 
table-access mechanisms defined by the network
management protocol in use.
IfIndex
The index value which uniquely identifies the
local interface through which the next hop of this
route should be reached.  The interface identified
by a particular value of this index is the same
interface as identified by the same value of
ifIndex.The special interface index zero (0)
means, discard the packet.
Metric1
The metric of the route as specified by the RIP 
protocol. When selecting routes, the route with the 
lowest value of ipRouteMetric1 is chosen.
Metric2
Defined, but not used by the BRICK.
Metric3
Defined, but nor used by the BRICK.
Metric4
Defined, but not used by the BRICK.
NextHop
The IP address of the next hop of this route.
(In the case of a route bound to an interface
which is realized via a broadcast media, the value
of this field is the agent's IP address on that
interface.)
Type
The type of route.  Note that the values
direct(3) and indirect(4) refer to the notion of
direct and indirect routing in the IP
architecture.
Setting this object to the value invalid(2) has
the effect of deleting the routing entry from 
the ipRouteTable.
other(1)	= none of the following;
delete(2);
invalid(2)	= an invalidated route
route to directly;
direct(3)	= connected (sub-)network
route to a non-local;
indirect(4)	= host/network/sub-network
Enumerations:
  • other (1)
  • invalid (2)
  • direct (3)
  • indirect (4)
Proto
The routing mechanism via which this route was
learned.  Inclusion of values for gateway routing
protocols is not intended to imply that hosts
should support those protocols.
other(1)	= none of the following;
local(2         = non-protocol information
e.g., manually configured
entries;
netmgmt(3)      = set via a network
management protocol;
icmp(4)         = obtained via ICMP,
e.g., Redirect;   
the remaining values are
all gateway routing  
protocols:
egp(5);
ggp(6);
hello(7);
rip(8); 
is-is(9);
es-is(10);
ciscoIgrp(11);
bbnSpfIgp(12);
ospf(13);    
bgp(14) 
Enumerations:
  • other (1)
  • local (2)
  • netmgmt (3)
  • icmp (4)
  • egp (5)
  • ggp (6)
  • hello (7)
  • rip (8)
  • is-is (9)
  • es-is (10)
  • ciscoIgrp (11)
  • bbnSpfIgp (12)
  • ospf (13)
  • bgp (14)
  • ospf-ext (31)
Age
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.
Mask
Indicate the mask to be logical-ANDed with the 
destination address before being compared to the value in the
ipRouteDest field. The BRICK is able to use arbitrary 
subnet-masks. If the subnet mask is not specified, it will be
set automatically according to the following table:
0.0.0.0                 default route
255.0.0.0               class-A
255.255.0.0             class-B
255.255.255.0           class-C
If the value of the ipRouteDest is 0.0.0.0 (a default
route) then the mask value is also 0.0.0.0. It should be 
noted that all IP routing subsystems implicitly use this
mechanism. Host routes are created by setting the subnet
mask to 255.255.255.255.
Metric5
Defined, but not used by the BRICK.
Info
A reference to MIB definitions specific to the particular
routing protocol which is responsible for this route, as
determined by the value specified in the route's 
ipRoute-Proto value. This value is currently not used 
by the BRICK and is therefore always set to 0.0.


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