Hi Robert, We have updated the draft and added a section for Capability Advertisement.
https://tools.ietf.org/html/draft-dhody-pce-stateful-pce-auto-bandwidth-07#section-5.1 5.1. Capability Advertisement During PCEP Initialization Phase, PCEP Speakers (PCE or PCC) advertise their support of Automatic Bandwidth Adjustment. A PCEP Speaker includes the "Auto-Bandwidth Capability" TLV, in the OPEN Object to advertise its support for PCEP Auto-Bandwidth extensions. The presence of the "Auto-Bandwidth Capability" TLV in the OPEN Object indicates that the Automatic Bandwidth Adjustment is supported as described in this document. The PCEP protocol extensions for Auto-Bandwidth adjustments MUST NOT be used if one or both PCEP Speakers have not included the "Auto- Bandwidth Capability" TLV in their respective OPEN message. If the PCEP speaker that supports the extensions of this draft but did not advertise this capability, then upon receipt of AUTO-BANDWIDTH- ATTRIBUTE TLV in LSPA object, it SHOULD generate a PCErr with error- type 19 (Invalid Operation), error-value TBD4 (Auto-Bandwidth capability was not advertised) and it will terminate the PCEP session. 5.1.1 AUTO-BANDWIDTH-CAPABILITY TLV The AUTO-BANDWIDTH-CAPABILITY TLV is an optional TLV for use in the OPEN Object for Automatic Bandwidth Adjustment via PCEP capability advertisement. Its format is shown in the following figure: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type=[TBD5] | Length=4 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Flags |B| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ AUTO-BANDWIDTH-CAPABILITY TLV format The type of the TLV is [TBD5] and it has a fixed length of 4 octets. The value comprises a single field - Flags (32 bits): o B (bandwidth usage - 1 bit): if set to 1 by a PCC, the B Flag indicates that the PCC allows reporting of bandwidth usage information; if set to 1 by a PCE, the B Flag indicates that the PCE is capable of receiving bandwidth usage information from the PCC. The BANDWIDTH-USAGE-ATTRIBUTE TLV MUST be encoded when both PCEP speakers have the B Flag set. Unassigned bits are considered reserved. They MUST be set to 0 on transmission and MUST be ignored on receipt. Advertisement of the Auto-Bandwidth capability TLV implies support of auto-bandwidth adjustment, as well as the objects, TLVs and procedures defined in this document. Thanks for your comments! Regards, Dhruv --------------------------------------------- From: Robert Varga <[email protected]<mailto:[email protected]>> Date: Sun, Jan 10, 2016 at 10:20 PM Subject: Auto-bandwidth capability? To: [email protected]<mailto:[email protected]> Hello, looking over draft-dhody-pce-stateful-pce-auto-bandwidth, it seems to modify the base protocol, but this modification is not negotiated -- potentially leading to PCC/PCE protocol mismatch, leading to unexpected PCErr's when operations are attempted. Would you consider adding a capability negotiation section, please? Thanks, Robert 本邮件及其附件含有华为公司的保密信息，仅限于发送给上面地址中列出的个人或群组。禁 止任何其他人以任何形式使用（包括但不限于全部或部分地泄露、复制、或散发）本邮件中 的信息。如果您错收了本邮件，请您立即电话或邮件通知发件人并删除本邮件！ This e-mail and its attachments contain confidential information from HUAWEI, which is intended only for the person or entity whose address is listed above. Any use of the information contained herein in any way (including, but not limited to, total or partial disclosure, reproduction, or dissemination) by persons other than the intended recipient(s) is prohibited. If you receive this e-mail in error, please notify the sender by phone or email immediately and delete it!
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