APM MIB Update

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APM MIB Update

• Steve Waldbusser
• San Diego IETF
• 12/11/00

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New APM MIB structure

• All applications and application verbs identified
  by appLocalIndex
• AppLocalIndex is 2 things
• Integer32 Textual Convention
• Used for agent-assigned index values to identify
  applications
• Any object with this type has values assigned by
  the agent out of the same space
• Therefore, no 2 values of any objects with type
  AppLocalIndex may conflict
• Index to apmAppDirectoryTable
• All values of all objects with type AppLocalIndex
  have an entry in this table
• apmAppDirectoryTable provides configuration
  information for each application, most notably
  the bucket boundaries
• Used to be protocolDirectoryExtensions table

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Where are protocols assigned?

• Protocol Directory Table
• Registered applications (e.g. Pop3, SAP/R3)
• Registered application verbs (e.g. Pop3 RETR,
  SAP/R3 AR)
• Either standards-based or commercial apps
• Unlikely to find custom in-house apps here
• Populated by the vendor with limited
  extensibility for population by the customer/NMS
• apmHttpFilterTable
• Web-hosted applications identified by a common
  URL prefix and/or server address (e.g.
  /finance/expenses.cgi, /hr/vacationrequest.cgi)
• Populated by customer/NMS
• apmUserDefinedTable
• Custom in-house applications (e.g. Set Credit
  Limit, FindLowestFare)
• Populated by implementation-specific means
• apmUserDefinedTable is read-only
• Practically speaking, this is populated by
  customer

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Example of Registration Tables
Protocol Directory Table
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Example of Registration Tables
Protocol Directory Table
apmHttpFilterTable
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Example of Registration Tables
Protocol Directory Table
apmHttpFilterTable
ReadOnly Assigned by agent from appLocalIndex
number space when row is created
Read/Write Chosen randomly by manager when
creating row
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Example of Registration Tables
Protocol Directory Table
apmHttpFilterTable
apmUserDefinedTable
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apmAppDirectoryTable
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Indexing Changes

• protocolDirID was the index for a number of
  data tables
• It has been replaced everywhere by appLocalIndex
• Allows data tables to record metrics for
  applications defined in apmHttpFilterTable and
  apmUserDefinedTable
• Its also greatly shortens the index of these
  tables

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apmReportTable Example

• Assume application aggregation for simplicity
• Fewer Rows
• Zeros for ServerAddress and ClientID

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• Throughput-Oriented These are request-response
  transactions that have larger and widely varying
  amounts of data to transfer. The responsiveness
  metric for throughput-oriented applications is
  the data rate. However, for consistency with the
  other metrics, where lower values are better,
  this metric is expressed as seconds per terabit.
  For example, 2 Kilobits per second is equal to
  500 million sec/Terabit and 1 Gigabit per second
  is equal to 1000 sec/Terabit. Software that
  displays these metrics to humans is urged to
  convert them to a more familiar form when
  displaying them,for example kilobits per second
  or megabits per second.