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| author | Ilya Etingof <etingof@gmail.com> | 2017-07-23 13:28:48 +0200 |
|---|---|---|
| committer | Ilya Etingof <etingof@gmail.com> | 2017-07-23 13:28:48 +0200 |
| commit | 311c004d52aa6407ee767f6ec44d11bca7849ebd (patch) | |
| tree | a2a6d83ebbcbcf048ba574a9848d2c2c7244ebae /docs | |
| parent | 20790316e63901b439eff43ec43f34e902d39897 (diff) | |
| download | pysnmp-git-311c004d52aa6407ee767f6ec44d11bca7849ebd.tar.gz | |
better explanation of the SNMP context
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/source/docs/api-reference.rst | 24 |
1 files changed, 18 insertions, 6 deletions
diff --git a/docs/source/docs/api-reference.rst b/docs/source/docs/api-reference.rst index 204caaa9..156971ca 100644 --- a/docs/source/docs/api-reference.rst +++ b/docs/source/docs/api-reference.rst @@ -242,16 +242,28 @@ SNMP Context ------------ SNMP engine may serve several instances of the same MIB within -possibly multiple SNMP entities. SNMP context is a method to -unambiguously identify a collection of MIB variables behind +possibly multiple SNMP entities. SNMP context is a tool for +unambiguously identifying a collection of MIB variables behind the SNMP engine. See :RFC:`3411#section-3.3.1` for details. .. note:: - SNMP context is only defined within SNMPv3 framework. For SNMPv1/v2c - architecture integration :RFC:`2576#section-5.1` introduces - interoperability aid which is available through - :py:class:`~pysnmp.hlapi.CommunityData`. + The SNMP context information is not tied to SNMPv3/USM user, + but it is transferred in SNMPv3 message header. + + Legacy SNMPv1/v2c protocols do not accommodate the SNMP context + information at all. + + To fit legacy SNMPv1/SNMPv2c systems into unified SNMPv3 + architecture, the mapping procedure is introduced by + :RFC:`2576#section-5.1` which essentially lets you first configure + and then supply the missing items (e.g. *contextName*, + *contextEngineId* and other) to the upper layers of SNMP stack + based on SNMPv1/v2c *communityName* and transport endpoint. + + The SNMP context information necessary for this mapping procedure + to operate is supplied through the + :py:class:`~pysnmp.hlapi.CommunityData` object. .. toctree:: :maxdepth: 2 |