User`s guide

501
For the Digi, this value is always 7 (Physical layer (21-1) + Data Link layer (22-1) +
Network layer (23-1)).
Interfaces
The Interfaces hierarchy consists of the ifnumber variable and the iftable node:
at\smib=mib-2.interfaces.ifnumber
The total number of interfaces on the unit. This includes Ethernet, PPP and virtual interfaces
(i.e. IPSec tunnels) and SYNC ports.
mib-2.interfaces.ifnumber = 52
at\smib=mib-2.interfaces.iftable
The iftable node contains ifentry nodes for each interface. For each table entry, an index
specifier must be appended to the end of each variable (e.g. for PPP0, 1 must be
appended).
at\smib=mib-2.interfaces.iftable.ifentry
at\smib=mib-2.interfaces.iftable.ifentry.ifindex
The unique index number of the interface.
at\smib=mib-2.interfaces.iftable.ifentry.ifdescr
This variable displays information about the interface. This information is displayed in the
format
<interface type>-<instance>, where:
<interface type> can be one of PPP, ETH, TUN (for IPSec tunnels), SNAIP (for SNAIP
links) or
SYNC, and
<instance> is the instance.
For example:
mib-2.interfaces.iftable.ifentry.ifdescr.1 = PPP-0
at\smib=mib-2.interfaces.iftable.ifentry.iftype
The type of interface, as described by the physical/link protocol below the network layer in
the protocol stack. Values can be one of the following:
PPP 23
ETH 6
IPSec Tunnel 131
SNAIP 17
SYNC port 118
For example:
mib-2.interfaces.iftable.ifentry.iftype.1 = 23
at\smib=mib-2.interfaces.iftable.ifentry.ifmtu
The size of the largest datagram (in octets) which can be sent on the interface. SNAIP and
SYNC ports always return 0. IPSec tunnel interfaces will return the underlying interface if it
can be located, otherwise 0 is returned. PPP interfaces will return the negotiated MTU if the
link is connected, otherwise 0 is returned.
For example:
mib-2.interfaces.iftable.ifentry.ifmtu.21 = 1504