企業強權 (Jack Welch and the GE Way, by Robert Slater)schmidt/it/pres05/RTPMIB… · Title:...
Transcript of 企業強權 (Jack Welch and the GE Way, by Robert Slater)schmidt/it/pres05/RTPMIB… · Title:...
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2005-6-24 1 Le Zhang
Real-Time Transport ProtocolManagement Information Base
RFC 2959
Le Zhang
6/18/2005
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2005-6-24 2 Le Zhang
Abstract
• This demo defines a portion of the Managment Information Base (MIB) for use with network managment protocols in the Internet community.
• In particular, it defines objects for managing Real-Time Transport Protocol (RTP) systems.
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2005-6-24 3 Le Zhang
Introduction
• The Network Management Framework
• Overview
• Definitions
• Security Considerations
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2005-6-24 4 Le Zhang
The Network Management Framework
• An overview: five major componets.– An overall architecture, described in [RFC 2571]– Structure of Management Information (SMI):
* data definition language for MIB objects– SNMP message protocol
* convey manager<->managed object info, commands– Protocol operations for accessing management
information– Fundmental applilcations [RFC2573] and View-based
Access Control Model (VACM) [RFC 2575]
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2005-6-24 5 Le Zhang
MIB and SMI• MIB
– a virtual information store– Holds objects for management purpose.
• SMI – defines objects in the MIB
• Compliance– This memo specifies a MIB module that is compliant to
the SMIv2.– A MIB conforming to the SMIv1 can be produced
through appropriate translations.
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2005-6-24 6 Le Zhang
MIB and SMI
OBJECT TYPE:OBJECT TYPE:OBJECT TYPE:
objects specified via SMIOBJECT-TYPE construct
MIB module specified via SMI MODULE-IDENTITY
(100 standardized MIBs, more vendor-specific)
MODULE
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2005-6-24 7 Le Zhang
RTP systems
• A host end-system– Sends or receives RTP data packets.
• An intermediate-system– Forwards RTP data packets.
• RTCP Packets– Sent by senders and receivers to convey informaion
about RTP packet transmission and reception.• RTP monitors
– Collect RTCP information on senders and receivers to and from an RTP host or intermediate-system.
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2005-6-24 8 Le Zhang
Components
• Session– The association of participants communicating with
RTP– For each participant, it is defined by one network
address plus a port pair for RTP and RTCP.
• Sender– The source of a stream of RTP packets
• Receiver– Can be a unicast or multicast receiver.
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2005-6-24 9 Le Zhang
Applicability of the MIB to RTP Implementaions
• RTP Host Systems
• RTP Monitors
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2005-6-24 10 Le Zhang
Applicability of the MIB to RTP Implementaions
• RTP Host Systems– Collect RTP session and stream data the host is
sending or receiving.– Used by a network Manager to detect and
diagnose faults that occur in an RTP session.
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2005-6-24 11 Le Zhang
Applicability of the MIB to RTP Implementaions
• RTP Monitors– RTP Monitors of multicast RTP sessions may be third-
party or located in the RTP host.– Collect RTP session and stream statistical data.– Collect data to permit a network manager to detect and
diagnose faults in the session or to configure its operation.
– Used by a network manager for capacity planning and other network-managment purposes.
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2005-6-24 12 Le Zhang
Applicability of the MIB to RTP Implementaions
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2005-6-24 13 Le Zhang
The Structure of the RTP MIB
• rtpSessionTable• rtpSenderTable• rtpRcvrTable• rtpsessionInverseTable• rtpSenderInverseTable• rtpRcvrTinverseTable
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2005-6-24 14 Le Zhang
The Structure of the RTP MIB
rtpSenderInverseTable ( rtpSessionDomain,
rtpSenderAddr,
rtpSessionIndex,
rtpSenderSSRC)
rtpSenderTable (rtpSessionIndex, rtpSenderSSRC)
•rtpSenderAddr
•rtpSenderSSRC
•...
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2005-6-24 15 Le Zhang
The Structure of the RTP MIB
rtpRcvrInverseTable (rtpSessionDomain,rtpRcvrAddr,rtpSessionIndex,rtpRcvrSRCSSRC,rtpRcvrSSRC)
rtpRcvrTable(rtpSessionIndex, rtpSenderSSRC)•rtpRcvrAddr•rtpRcvrSSRC•rtpRcvrSRCSSRC•...
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2005-6-24 16 Le Zhang
The Structure of the RTP MIB
rtpSessionInverseTable (rtpSessionDomain,rtpSessionRemAddr,rtpSessionLocAddr,rtpSessionIndex)
rtpSessionTable(rtpSessionIndex)•rtpSessionDomain•rtpSessionIndex•...
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2005-6-24 17 Le Zhang
Security Considerations
• MIBs are not themselves security risks• SNMP access to objects in MIB should be
restricted.• Security features provided by SNMPv3
framework are recommended.– It is the user‘s responsiblity to properly
configure the SNMP entry.
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2005-6-24 18 Le Zhang
Reference
• [RFC 2959]• [RFC 1155]• [RFC 1157]• [RFC 1906]• [RFC 2572]• ....
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2005-6-24 19 Le Zhang
The end
Thanks for listening ^_^