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Dave Thaler dthaler@microsoft

Subtree Retrieval MIB draft-irtf-nmrg-get-subtree-mib-00.txt http://www.eecs.umich.edu/~thalerd/subtree.txt. Dave Thaler dthaler@microsoft.com. Problem:. Bulk subtree(s) retrieval "Overshoot" by guessing max-repetitions too large

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Dave Thaler dthaler@microsoft

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  1. Subtree Retrieval MIBdraft-irtf-nmrg-get-subtree-mib-00.txthttp://www.eecs.umich.edu/~thalerd/subtree.txt Dave Thaler dthaler@microsoft.com

  2. Problem: • Bulk subtree(s) retrieval • "Overshoot" by guessing max-repetitions too large • Or issue sequential requests (larger time window of missing changes, more pkts on wire, etc) • Latency • etc

  3. Goals: • Goals in common with new-PDU approach: • single "request" message • multiple "response" messages, as large as possible • make it easy to know what ranges, if any, got dropped (if over udp) • allow halting operation in progress (e.g. oid typo) • Goals in common with FTP approach: • No changes to existing SNMP protocol • No changes to some master agents (see Limitations slide later on)

  4. Mechanism: • "request" is a set (row creations) in a new MIB • "responses" are traps: • response destination must be a legal notification target in SNMP-TARGET-MIB • conceptual row deleted automatically when done • can cancel operation via row deletion SetRequest Response Trap Trap . . . Trap

  5. Limitations: • Application must be allowed to issue SETs to this MIB • Command responder/notification originator tightly coupled • Command generator/notification responder tightly coupled • Subagent implementing MIB must be able to call back into the SNMP agent to walk other MIBs, without causing a deadlock

  6. Trap contains: • Read-only objects in “request” row created: • seqno (to detect losses) • "done" flag • Bunch of varbinds requested • Encoding optimizations possible (same as with other approaches), but not discussed in this document • App stops waiting for traps when gets “done” and has all seqno’s, or after timeout.

  7. TODO • Need to update to get multiple subtrees in parallel • Initial version didn’t include this just to give the general idea • Implementation • Co-author(s)?

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