Re: [CCAMP] WG Last Call on draft-ietf-ccamp-flexible-grid-ospf-ext-04
Dieter Beller <Dieter.Beller@nokia.com> Thu, 30 June 2016 08:51 UTC
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To: Fatai Zhang <zhangfatai@huawei.com>, "CCAMP (ccamp@ietf.org)" <ccamp@ietf.org>
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From: Dieter Beller <Dieter.Beller@nokia.com>
Organization: Nokia
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Date: Thu, 30 Jun 2016 10:50:53 +0200
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Subject: Re: [CCAMP] WG Last Call on draft-ietf-ccamp-flexible-grid-ospf-ext-04
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I've reviewed this document and I have the following comment:
Section 4.1:
4.1. ISCD Extensions for Flexi-grid Value Type ----- ---- 152 (TBA by IANA) Flexi-Grid-LSC capable Switching Capability and Encoding values MUST be used as follows: Switching Capability = Flexi-Grid-LSC Encoding Type = lambda [as defined in https://tools.ietf.org/html/rfc3471" rel="nofollow">RFC3471] When Switching Capability and Encoding fields are set to values as stated above, the Interface Switching Capability Descriptor MUST be interpreted as in [https://tools.ietf.org/html/rfc4203" rel="nofollow">RFC4203] with the optional inclusion of one or more Switching Capability Specific Information sub-TLVs.
draft-ietf-ccamp-flexible-grid-ospf-ext-04 defines the Switching Capability Specific Information sub-TLVs, but the ISCD as defined
in RFC4203 contains "Max LSP Bandwidth at priority x" fields in the generic ISCD part and these fields do IMHO not make
sense for flex grid (see below). The draft does not say how these fields shall be filled.
Excerpt from RFC4203:
1.4. Interface Switching Capability Descriptor The Interface Switching Capability Descriptor is a sub-TLV (of type 15) of the Link TLV. The length is the length of value field in octets. The format of the value field is as shown below: 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 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Switching Cap | Encoding | Reserved | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 0 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 1 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 2 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 3 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 4 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 5 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 6 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Max LSP Bandwidth at priority 7 | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Switching Capability-specific information | | (variable) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ The Switching Capability (Switching Cap) field contains one of the following values: 1 Packet-Switch Capable-1 (PSC-1) 2 Packet-Switch Capable-2 (PSC-2) 3 Packet-Switch Capable-3 (PSC-3) 4 Packet-Switch Capable-4 (PSC-4) 51 Layer-2 Switch Capable (L2SC) 100 Time-Division-Multiplex Capable (TDM) 150 Lambda-Switch Capable (LSC) 200 Fiber-Switch Capable (FSC) The Encoding field contains one of the values specified in https://tools.ietf.org/html/rfc4203#section-3.1.1" rel="nofollow">Section https://tools.ietf.org/html/rfc4203#section-3.1.1" rel="nofollow">3.1.1 of [https://tools.ietf.org/html/rfc4203#ref-GMPLS-SIG" title='"Generalized Multi-Protocol Label Switching (GMPLS) Signaling Functional Description"' rel="nofollow">GMPLS-SIG]. Maximum LSP Bandwidth is encoded as a list of eight 4 octet fields in the IEEE floating point format [https://tools.ietf.org/html/rfc4203#ref-IEEE" title='"IEEE Standard for Binary Floating-Point Arithmetic"' rel="nofollow">IEEE], with priority 0 first and priority 7 last. The units are bytes (not bits!) per second. The content of the Switching Capability specific information field depends on the value of the Switching Capability field.
Minor nits:
page 5 typo:
'Chanel Spacing' instead of 'Channel Spacing'
page 7 editorial:
'Flexi-Grid-LSC capable': capable should be removed (already included in the LSC abbreviation).
Thanks,
Dieter
Hi all,
This starts a two week working group last call on [draft-ietf-ccamp-flexible-grid-ospf-ext-04].
The working group last call ends on Friday, July 8th. Please send your comments to the CCAMP mailing list.
As is always the case, positive comments, e.g., "I've reviewed this document and believe it is ready for publication", are welcome. This is useful and important, even from authors.
Since the WG chairs and secretary are co-authors/co-contributor of this draft, if anyone is willing to be the shepherd of the document, please volunteer.
Note that no IPR was disclosed against this document.
Thanks
Fatai and Daniele
_______________________________________________ CCAMP mailing list CCAMP@ietf.org
- [CCAMP] 答复: WG Last Call on draft-ietf-ccamp-flex… Fatai Zhang
- [CCAMP] 答复: 答复: WG Last Call on draft-ietf-ccamp-… Zhenghaomian
- Re: [CCAMP] 答复: WG Last Call on draft-ietf-ccamp-… Dieter Beller
- [CCAMP] 答复: WG Last Call on draft-ietf-ccamp-flex… Zhenghaomian
- Re: [CCAMP] WG Last Call on draft-ietf-ccamp-flex… Dieter Beller
- Re: [CCAMP] WG Last Call on draft-ietf-ccamp-flex… Dieter Beller
- [CCAMP] WG Last Call on draft-ietf-ccamp-flexible… Fatai Zhang