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E-33170-A2-GB20-20 December 1996
Interface Group – “ifIndex” Object (ifEntry 1)
This object provides the index into the ifT
able and
typically into tables in other MIBs also. The values of the
ifIndex object do not vary between models even though
not all indexes are supported for a particular model. When
an unsupported index is accessed, “noSuchName” is
returned.
The following are the values of the ifIndexes for all
E1 DSU/CSU models:
• 1 – Net E1
• 2 – DTE E1
•
3 – COM port
• 4 – (not used)
• 5 – Auxiliary RS-232 port
• 6 – DCE port 1
• 7 – DCE port 2
• 8 – DCE port 3
• 9 – DCE port 4
The supported ifIndexes for the 3172 DSU/CSU are:
• Net E1
• DTE E1
•
COM port
• Auxiliary RS-232 port
• DCE port 1
• DCE port 2
The supported ifIndexes for the 3174 DSU/CSU are:
• Net E1
• DTE E1
•
COM port
• Auxiliary RS-232 port
• DCE port 1
• DCE port 2
• DCE port 3
• DCE port 4
Interface Group – “ifDescr” Object (ifEntry 2)
This object provides the textual information about the
interface. Each interface displays a text string as shown
below:
Network E1: “Network E1. E1 DSU/CSU,
Hardware Version: [CCA number
for the CSU board]”.
DTE E1: “DTE E1. E1 DSU/CSU,
Hardware Version: [CCA number
for the CSU board]”.
COM: “COM port. E1 DSU/CSU,
Hardware Version: [CCA number
for the CSU board]”.
AUX: “AUX port. E1 DSU/CSU,
Hardware Version: [CCA number
for the CSU board]”.
Data Ports: “Data Port n. E1 DSU/CSU,
Hardware Version: [CCA number
for the DSU board]” (where n is 1
to 4).
Interface Group – “ifType” Object (ifEntry 3)
This object identifies the type of the interface based on
the physical/link protocol(s) immediately below the
network layer. Only the following values are supported by
the E1 DSU/CSU:
• e1(19) – Used for the network and DTE Drop/Insert
interfaces.
• propPointToPointSerial(22) – Used for the
synchronous data ports and for the COM port when
the port is not configured as the SNMP
management interface.
• ppp(23) – Used for the AUX or COM port when
the port is configured for PPP.
• slip(28) – Used for the COM port when the port is
configured for SLIP.