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(ASCEND) Request for comments: Proposed changes to the SNMP Interface MIB support

We have completed a draft of the changes that we plan on making to the MAX
and TNT MIBII interface table.

Problem:
    - Currently the SNMP MIB-II interface table for the MAX/TNT contains an
    entry for each physical interfaces as well as *all* potential WAN
    connections supported by the system.  This results in a very large
    interface table; a fully populated TNT would have over a thousand
    entries and take a while to scan.

Solution:
    - Reduce the size of interface table

    By default, the interface table will contain only physical interfaces,
encapsulated
    protocols such as Frame Relay or PPP over a nailed group, and network
    layer interfaces.  There is an option to include DS0 bundles and Virtual
Circuits
    in the interface table as well.


Problem:
    - Interface statistic counters are incremented only for the session
    layer interface entries - WAN ports; these interfaces move around.

Solution:
- All nailed interfaces will have counters at the link level - PPP or Frame.
Octet counters will not be supported for switched DS1 interfaces. Tracking
the octets on PRIs used for switched calls isn't very useful. On these
interfaces
Measuring channel usage is.


Problem
    - WAN entries for nailed connection in the interface table
    move around.  This makes it very difficult for Network Management
    Station to poll for historical data.

Solution
    The value of ifIndex of an interface entry in the interface table will
    be saved in NVRAM or Flash so it will not change between system reboot.
    Also if an entry is dynamically removed from the interface table, its
    ifIndex value must not re-used until after the following
    re-intialization of the network management agent.

Problem:
     - No support RFC 2233, the Interface Group MIB

Solution:

Add support for RFC2233.

     ifTable
	This table is the ifTable from MIB-II (RFC 1213)

    ifXTable
	This table contains objects that have been addded to the Interface
 	MIB as a result of the Interface Evolution effort (RFC 1573), or
 	replacements for objects of the original (MIB-II) ifTable that were
 	deprecated.  This table also contains objects that were previously
 	in the ifExtsTable (RFC 1573).

    ifStackTable
	This table contains objects that define the relationships among the
 	sub-layers of an interface.


Ken Packert
Ascend Communications
Network Management Division

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