1 / 9

BFD Stability draft-ashesh-bfd-stability-00

BFD Stability draft-ashesh-bfd-stability-00. Ashesh Mishra Santosh Pallagatti Mahesh Jethanandani Mach Chen Ankur Saxena. Agenda. BFD Stability. Motivations Design Overview Issues Q&A. Motivations. BFD Stability. Motivations Need better stability information

karl
Download Presentation

BFD Stability draft-ashesh-bfd-stability-00

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. BFD Stabilitydraft-ashesh-bfd-stability-00 Ashesh Mishra Santosh Pallagatti Mahesh Jethanandani Mach Chen Ankur Saxena

  2. Agenda BFD Stability • Motivations • Design Overview • Issues • Q&A

  3. Motivations BFD Stability • Motivations • Need better stability information • Ability to predict BFD failures

  4. Design Overview BFD Stability • Design Overview 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Auth Type | Auth Len | Auth Key ID | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Sequence Number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Sender Timestamp 1 (IFG only) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Sender Timestamp 2 (IFG+TD only) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +---------+ +---------+ | Sender |==============...=============| Receiver| +---------+ +---------+ | | | | TD-ST | | RD-RT IFG-ST IFG-RT

  5. Issues BFD Stability • Issue 1 • “Sender Timestamp 1” has different meanings in IFG mode and IFG-TD mode. • Where do the timestamps get generated? Solution: ST1 will be time-stamped at the end of the transmission engine. ST2 will be generated when the decision to Tx is made.

  6. Issues BFD Stability • Issue 2 • “Length” field should not be used for identifying the TLV-type Solution: Use reserved-bits to identify the TLV-type or use different auth-types to achieve the same result.

  7. Issues BFD Stability • Issue 3 • This mechanism should not prevent the use of other authentication mechanisms Solution: Agreed. There should be an ability to stack authentication TLVs.

  8. Issues BFD Stability • Issue 4 • This is similar to LMM/DMM Solution: While the data generated by this mechanism is similar, it’s use isn’t. LMM/DMM cannot indicate issues specifically with the BFD engine and cannot explicitly measure BFD session stability. LMM/DMM deals with characterizing data-path performance. This method deals with OAM-plane performance and hence is a better diagnostic tool for BFD.

  9. Q&A BFD Stability Q&A

More Related