Last Modified: 2005-02-02
Done | Submit initial Framework document | |
Done | Submit initial Packet selector and packet information document | |
Done | Submit initial Report format and report stream format document | |
Done | Submit initial Export and requirements for collectors document | |
Done | Submit initial MIB document | |
May 03 | Submit final Framework document | |
May 03 | Submit final Packet selector and packet information document | |
Sep 03 | Submit final Report format and report stream format document | |
Oct 03 | Submit final Export and requirements for collectors document | |
Nov 03 | Submit final MIB document |
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Minutes of the PSAMP BOF session at IETF 62 Thursday March 10, 16:45 h - 17:45 h =========================================== Packet Sampling Working Group Chairs: Andy Bierman <abierman@cisco.com> Juergen Quittek <quittek@netlab.nec.de> Minutes taken by Ralf Wolter 0. Session Summary 1. PSAMP WG Status 2. Update of Packet Selection 3. PSAMP MIB 4. Continuation of work on PSAMP protocol ---------------- Discussed Internet drafts A Framework for Passive Packet Measurement http://www.ietf.org/internet-drafts/draft-ietf-psamp-framework-10.txt Sampling and Filtering Techniques for IP Packet Selection http://www.ietf.org/internet-drafts/draft-ietf-psamp-sample-tech-06.txt Definitions of Managed Objects for Packet Sampling http://www.ietf.org/internet-drafts/draft-ietf-psamp-mib-04.txt ---------------- 0. Session Summary The PSAMP framework document is ready to be submitted to the IESG. The packet selection document completed WG last call and the next version will include all agreed changes. Both documents will be submitted together as soon as the next version of the packet selection document is available. The MIB module still has open issues. Solutions for several issues were found during the session. A new version fixing all current is planned for June. WG last call on this document is planned to close at IETF63. The protocol document and info model document are expired. The IPFIX WG plans to submit the corresponding IPFIX document by March to the IESG. At this time work on the two PSAMP documents will start again. A stable version was planned for IETF63 and WG last call in September 2005. ---------------- 1. PSAMP WG Status (Juergen) The PSAMP framework document passed WG last call. It will be forwarded to the IESG together with the Packet Selection draft, for which WG last call will close at the end of the IETF meeting. Protocol and info model are on hold until IPFIX completes the corresponding documents. These drafts are expired. The PSAMP MIB is progressing. ---------------- 2. Sampling and Filtering Techniques (Tanja Zseby) draft-ietf-psamp-sample-tech-06.txt Tanja reported changes since the last version including several clarifications and harmonization of terminology. The only technical change was limiting combinations of filters to AND combinations only. OR combinations are not supported anymore. Some minor edits are still required. Beyond this, the only open issue is the discussion of hash functions. Implementing hash functions is not mandatory, but if they are supported, then the recommended one SHOULD be supported. The current version recommends IPSX for packet selection and CRC for packet digest. IPSX does not work for IPv6, but for IPv4 it is 7 times faster than BOB. But BOB works well for IPv6. BOB performs similarly to CRC for packet digest. After some discussions, it was agreed to recommend BOB for both, packet selection and packet digest. IPSX and CRC will be optional. Tanja suggested proposing the investigation of an optimal hash function for IPv6 as work item for the IRTF IMRG. ---------------- 3. PSAMP MIB (Benoit Claise) draft-ietf-psamp-mib-04.txt Benoit explained that the main changed since the previous version was the completion of modelling all filter and sampling functions. Additionally, several clarifications were applied and terminology was harmonized. Still there is a significant list of open issues. The document needs more diagrams and examples to explain the interconnection of different parts of the MIB. An entity relationship diagram should be added. References with object IDs must be explained, especially pointers and their relationship to the functions and input parameters a new section is required. Hash filtering is the most difficult part in the draft, it is still not finally decided how to integrate hash filtering into the MIB. Should more hash functions be supported? BenoitÕs proposal was limiting the complexity. Should all hash parameter functions be implemented in the MIB? This has security issues, as a simple snmpwalk would provide all details and could lead to a potential attack. The problem is that knowledge about the hash functions parameter could result in an attack against the collector (either to avoid collection or to make sure certain packet patterns are collected). [Juergen] SNMPv3 would solve the issue. But how many customers use SNMPv3? The description of RowStatus objects must clearly state the minimum sets of objects per table. Row state filtering: today there is one big table, sub-tables would make the implementation easier. Still multiple editorial changes are required. [Juergen] It would be very helpful to add usage examples required that clarify the sequence of actions how to setup a filter by using tables etc. ---------------- 4. Continuation of work on PSAMP protocol The following milestones were discussed and agreed. The WG charter page needs to be updated accordingly. May 05: framework and sample tech to IESG Jun 05: new version of the MIB that fixes the current issue IETF63: stable version of protocol and info model for next meeting; IETF63: last call on MIB Sep 05: last call on protocol and info model |