| Interdomain Routing Working Group | X. Geng |
| Internet-Draft | M. Chen |
| Intended status: Standards Track | Huawei |
| Expires: January 9, 2020 | Z. Li |
| F. Qin | |
| China Mobile | |
| L. Qiang | |
| July 8, 2019 |
IGP-TE Extensions for DetNet Information Distribution
draft-geng-detnet-info-distribution-04
This document extends the IGP-TE, including OSPF-TE and ISIS-TE, to support DetNet by specifying new information that can be placed in Link State Protocol Data Units (LSP). This information describes additional details regarding the state of the network that are useful for DetNet computations.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119.
This Internet-Draft is submitted in full conformance with the provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering Task Force (IETF). Note that other groups may also distribute working documents as Internet-Drafts. The list of current Internet-Drafts is at https://datatracker.ietf.org/drafts/current/.
Internet-Drafts are draft documents valid for a maximum of six months and may be updated, replaced, or obsoleted by other documents at any time. It is inappropriate to use Internet-Drafts as reference material or to cite them other than as "work in progress."
This Internet-Draft will expire on January 9, 2020.
Copyright (c) 2019 IETF Trust and the persons identified as the document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal Provisions Relating to IETF Documents (https://trustee.ietf.org/license-info) in effect on the date of publication of this document. Please review these documents carefully, as they describe your rights and restrictions with respect to this document. Code Components extracted from this document must include Simplified BSD License text as described in Section 4.e of the Trust Legal Provisions and are provided without warranty as described in the Simplified BSD License.
There are many use cases from diverse industries which have the need in common for deterministic service, for example: audio video production, industrial process control and mobile access networks. The requirements can be summarized as:
Deterministic Networking (DetNet) can satisfy the requirements by the following techniques:
To make the above techniques work, it's necessary to know the capabilities (e.g., DetNet capable or not, which congestion protection algorithms are supported, etc.), resources (e.g, dedicated bandwidth for DetNet, buffers, etc.), performance (e.g., device/queue/link delay etc.) and other relevant information of each DetNet capable node. Then, a DetNet path computation element (e.g., PCE or ingress of a DetNet flow) can use these information to compute a path that satisfies the requirement of a specific DetNet flow. Specifically, according to the requirements stated in DetNet architecture, the information should include:
This document defines extensions to OSPF and ISIS to distribute the above DetNet information at node and/or link granularity.
Some of information (e.g., Link delay/loss ) can be distributed and collected through Traffic Engineering (TE) metric extensions and [RFC7810], which are not covered by this document.
All the DetNet related terminologies used in this document conform to the DetNet architecture.
This document defines an extension to OSPF used to advertise DetNet information.
New OSPF DetNet sub-TLVs for Node Attribute TLV[RFC5786] are defined to distribute the DetNet information of a node. These sub-TLVs include:
______________________________________________________________
| Type | Length | Value |
|------------------------------------------------------------|
| TBD1 | 8 | DetNet Processing Delay |
| TBD4 | 4 | PREOF Capability |
|________|_______________|___________________________________|
In the scope of DetNet, packet processing delay, which begins after the packet goes into the input port and ends before the packet arrives the output buffer, can expected in a known range, and the value of the delay bound is specified in this sub-TLV, including:
The format of this sub-TLV is shown in the following diagram:
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 2 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type(TBD1) | Length(8) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RESERVED | Minimum DetNet Processing Delay | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RESERVED | Maximum DetNet Processing Delay | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RESERVED | Maximum DetNet Processing Delay Variation | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 2 octets in length, and the value is TBD1.
The Length field is 2 octets in length and its value is 8.
The RESERVED field is reserved for future use. It MUST be set to 0 when sent and MUST be ignored when received.
The Minimum DetNet Processing Delay field is 3 octets, and presents the minimum delay for a DetNet flow in the device, excluding the queuing delay in output port. The units are microsecond.
The Maximum DetNet Processing Delay field is 3 octets, and presents the maximum delay for a DetNet flow in the device, excluding the queuing delay in output port. The units are microsecond.
The Maximum DetNet Processing Delay Variation field is 3 octets in length, and presents the maximum delay variation for a DetNet flow in the device, excluding the queuing delay in output port. The units are microsecond.
PREOF (Packet Replication/Elimination/Ordering Function) is for DetNet service protection, which includes:
This sub-TLV specifies a set of PREOF capabilities and relevant parameters at node granularity. PREOF can also be advertised as Link attribute (section 3.2.3), when not all of the ports in the node support PREOF.
The format of this sub-TLV is shown in the following diagram:
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(TBD4) | Length(4) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Flags | Maximum out-of-order Packet Number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 2 octets in length, and the value is TBD4.
The Length field is 2 octets in length and its value is 4.
The Flags field is 1 octet in length, and it is designed as follows:
0 1 2 3 4 5 6 7 8 +-+-+-+-+-+-+-+-+ |R|E|O| | +-+-+-+-+-+-+-+-+
where:
Maximum out-of-order Packet Number field is 3 octet in length, and presents the maximum number of out-of-order packets that this link can support, it depends on the reserved buffer size for packet reordering. This value is valid only when the O-flag is set.
Editor' note: Maximum Replicated Copies number may be added in the future version.
New OSPF DetNet sub-TLVs for Link TLV are defined to distribute DetNet information of a link. These sub-TLVs include:
______________________________________________________________
| Type | Length | Value |
|------------------------------------------------------------|
| TBD2 | 4 | Max DetNet Reservable Bandwidth |
| TBD3 | 4 | DetNet Available Bandwidth |
| TBD4 | 4 | PREOF Capability |
| TBD5 | 4 | Queuing Algorithm Capabilities |
| TBD6 | 10 | Queue Parameters |
|________|_______________|___________________________________|
This sub-TLV specifies the maximum amount of bandwidth that is reserved for DetNet on this link. Note that this value SHOULD be smaller than the value of Maximum Reservable Bandwidth sub-TLV. The value normally depends on the queuing management algorithm and is user-configurable. In some particular queuing management algorithm (e.g. Credit Based shaper in AVB), this value will affect the calculation of maximum queuing delay of the DetNet flow. The units are bytes per second.
The format of this sub-TLV is shown in the following diagram:
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(TBD2) | Length(4) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RESERVED | Maximum DetNet Reservable Bandwidth | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 2 octets in length, and the value is TBD2.
The Length field is 2 octets in length and its value is 4.
The RESERVED field is reserved for future use. It MUST be set to 0 when sent and MUST be ignored when received.
This Maximum DetNet Reservable Bandwidth field is 3 octets in length, and presents the maximum bandwidth that may be reserved for DetNet. The units are bytes per second.
This sub-TLV specifies the available bandwidth that can be reserved for DetNet flow on this link for now. Considering that there is no generally accepted DetNet traffic classification, this value contains all the available DetNet Bandwidth from different DetNet traffic classes (if there is any), which differs from the Unreserved Bandwidth defined in.
The format of this sub-TLV is shown in the following diagram:
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(TBD3) | Length(4) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RESERVED | Available DetNet Bandwidth | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 2 octets in length, and the value is TBD3.
The Length field is 2 octets in length and its value is 4.
The RESERVED field is reserved for future use. It MUST be set to 0 when sent and MUST be ignored when received.
This Available DetNet Bandwidth field is 3 octets in length, and presents the available bandwidth for DetNet in this link. The units are bytes per second.
PREOF (Packet Replication/Elimination/Ordering Function) is for DetNet service protection, which includes :
This sub-TLV specifies a set of PREOF capabilities and relevant parameters at link granularity. PREOF can also be advertised as node attribute (section 3.1.2), when all of the ports in the node support PREOF.
The format of this sub-TLV is shown in the following diagram:
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(TBD4) | Length(4) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Flags | Maximum out-of-order Packet Number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 2 octets in length, and the value is TBD4.
The Length field is 2 octets in length and its value is 4.
The Flags field is 1 octet in length, and it is designed as follows:
0 1 2 3 4 5 6 7 8 +-+-+-+-+-+-+-+-+ |R|E|O| | +-+-+-+-+-+-+-+-+
where:
Maximum out-of-order Packet Number field is 3 octet in length, and presents the maximum number of out-of-order packets that this link can support, it depends on the reserved buffer size for packet reordering. This value is valid only when the O-flag is set.
This sub-TLV specifies queuing management algorithms capabilities to gaurante bounded queuing latency [I-D.finn-detnet-bounded-latency].
The format of this sub-TLV is shown in the following diagram:
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 | RESERVED | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Length field is 2 octets in length and its value is 4.
The RESERVED field is reserved for future use. It MUST be set to 0 when sent and MUST be ignored when received.
The Flags field is 1 octet in length, and it is designed as follows:
0 1 2 3 4 5 6 7 8 +-+-+-+-+-+-+-+-+ |C|T|H|A| | +-+-+-+-+-+-+-+-+
where:
In the context of DetNet, the delay of queuing is bounded, and the bound depends on what queuing management method is used and how many buffers are allocated. This sub-TLV specifies the DetNet queue parameters.
The format of this sub-TLV is shown in the following diagram:
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(TBD6) | Length(10) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Queue Identifier | Queue Buffer Size | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Flags | Maximum Queuing Delay | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RESERVED | Minimum Queuing Delay | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RESERVED | Maximum Queuing Delay Variation | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Length field is 2 octets in length and its value is 10.
The Queue Identifier field is 3 octets in length, and specifies the identifier of a queue. It could be an internal identifier that is only used within a node. Or it could be used by a centralized controller to specify in which specific queue a flow/packet is required to enter.
The Queue Buffer Size field is 3 octets in length, and specifies the size of a queue with unit of bytes.
The Flags field is 1 octet in length, and it is designed as follows:
0 1 2 3 4 5 6 7 8 +-+-+-+-+-+-+-+-+ |C|T|H|A| | +-+-+-+-+-+-+-+-+
where:
The RESERVED field is reserved for future use. It MUST be set to 0 when sent and MUST be ignored when received.
Minimum Queuing Delay is 3 octets in length, and carries minimum queuing delay value (in microseconds) encoded as an integer value. Implementations may also add this to the value of Min Delay Unidirectional Link Delay Sub-TLV in order to advertise the minimum delay of this link. Min Queuing Delay can be the same with the Max Queuing Delay.
Maximum Queuing Delay is 3 octets in length, and carries the maximum queuing delay value (in microseconds) encoded as an integer value. Implementations may also add this to the value of Max Delay Unidirectional Link Delay Sub-TLVto order to advertise the maximum delay of this link.
Maximum Queuing Delay variation is 3 octets in length, and carries the maximum queuing delay variation value (in microseconds) encoded as an integer value.
The RESERVED field is reserved for future use. It MUST be set to 0 when sent and MUST be ignored when received.
This document defines an extension to IS-IS used to advertise DetNet information.
The DetNet node sub-TLVs are defined within the body of the IS-IS Router Capability TLV [RFC7981] to carry DetNet information.
This sub-TLV specifies the DetNet packet porcessing parameters. The reader can know more about this sub-TLV referring to section 3.1.
The format of this sub-TLV is shown in the following diagram:
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 2 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Type(TBD7) | Length(8) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RESERVED | Minimum DetNet Processing Delay | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RESERVED | Maximum DetNet Processing Delay | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RESERVED | Maximum DetNet Processing Delay Variation | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 1 octets in length, and the value is TBD7.
The Length field is 1 octets in length and its value is 8.
The RESERVED field is reserved for future use. It MUST be set to 0 when sent and MUST be ignored when received.
The Minimum DetNet Processing Delay is 3 octets in length and presents the minimum delay for a DetNet flow in the device, excluding the queuing delay in output port. The units are microsecond.
The Maximum DetNet Processing Delay is 3 octets in length and presents the maximum delay for a DetNet flow in the device, excluding the queuing delay in output port. The units are microsecond.
The Maximum DetNet Processing Delay Variation is 3 octets in length and presents the maximum delay variation for a DetNet flow in the device, excluding the queuing delay in output port. The units are microsecond.
This sub-TLV specifies a set of PREOF capabilities and relevant parameters in sub-TLV. The reader can know more about this sub-TLV referring to section 3.4.
The format of this sub-TLV is shown in the following diagram:
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(TBD10) | Length(4) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Flags | Maximum out-of-order Packet Number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 1 octets in length, and the value is TBD10.
The Length field is 1 octets in length and its value is 4.
The Flags field is 1 octet in length, and it is designed as follows:
0 1 2 3 4 5 6 7 8 +-+-+-+-+-+-+-+-+ |R|E|O| | +-+-+-+-+-+-+-+-+
where:
Maximum out-of-order Packet Number field is 3 octets in length and presents the maximum number of out-of-order packets that this link can support, it depends on the reserved buffer size for packet reordering. This value is valid only when the O-flag is set.
Editor' note: Maximum Replicated Copies number may be added in the future version.
This document defines new IS-IS TE sub-TLVs that can be announced in the TLVs 22, 23, 141, 222, and 223 in order to distribute DetNet information. The sub-TLV extensions below build on the ones provided in,and
This sub-TLV specifies the maximum amount of bandwidth that is reserved for DetNet on this link. Note that this value SHOULD be smaller than the value of Maximum Reservable Link Bandwidth. The reader can know more about this sub-TLV referring to section 3.2.
The format of this sub-TLV is shown in the following diagram:
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(TBD8) | Length(4) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RESERVED | Maximum DetNet Reservable Bandwidth | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 1 octets in length, and the value is TBD8.
The Length field is 1 octets in length and its value is 4.
The RESERVED field is reserved for future use. It MUST be set to 0 when sent and MUST be ignored when received.
This Maximum DetNet Reservable Bandwidth field is 3 octets in length and presents the maximum bandwidth that may be reserved for DetNet. The units are bytes per second.
This sub-TLV specifies the available bandwidth that can be reserved for DetNet flow on this link for now. It is different from the Unreserved Bandwidth sub-TLV defined in referring to section 3.3.
The format of this sub-TLV is shown in the following diagram:
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(TBD9) | Length(4) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RESERVED | Available DetNet Bandwidth | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 1 octets in length, and the value is TBD9.
The Length field is 1 octets in length and its value is 4.
The RESERVED field is reserved for future use. It MUST be set to 0 when sent and MUST be ignored when received.
This Available DetNet Bandwidth field is 3 octets in length and presents the available bandwidth for DetNet in this link. The units are bytes per second.
This sub-TLV specifies a set of PREOF capabilities and relevant parameters in sub-TLV. The reader can know more about this sub-TLV referring to section 3.4.
The format of this sub-TLV is shown in the following diagram:
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(TBD10) | Length(4) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Flags | Maximum out-of-order Packet Number | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Type field is 1 octets in length, and the value is TBD10.
The Length field is 1 octets in length and its value is 4.
The Flags field is 1 octet in length, and it is designed as follows:
0 1 2 3 4 5 6 7 8 +-+-+-+-+-+-+-+-+ |R|E|O| | +-+-+-+-+-+-+-+-+
where:
Maximum out-of-order Packet Number field is 3 octets in length and presents the maximum number of out-of-order packets that this link can support, it depends on the reserved buffer size for packet reordering. This value is valid only when the O-flag is set.
Editor' note: Maximum Replicated Copies number may be added in the future version.
This sub-TLV specifies queuing management algorithms capabilities to gaurante bounded queuing latency [I-D.finn-detnet-bounded-latency].
The format of this sub-TLV is shown in the following diagram:
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(TBD11) | Length(4) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Flags | RESERVED | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Length field is 1 octets in length and its value is 4.
The Flags field is 1 octet in length, and it is designed as follows:
0 1 2 3 4 5 6 7 8 +-+-+-+-+-+-+-+-+ |C|T|H|A| | +-+-+-+-+-+-+-+-+
where:
In the context of DetNet, the delay of queuing is bounded, and the bound depends on what queuing management method is used and how many buffers are allocated. This sub-TLV specifies the DetNet queue parameters.
The format of this sub-TLV is shown in the following diagram:
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(TBD12) | Length(10) | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Queue Identifier | Queue Buffer Size | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Flags | Maximum Queuing Delay | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RESERVED | Minimum Queuing Delay | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | RESERVED | Maximum Queuing Delay Variation | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
The Length field is 1 octets in length and its value is 10.
The Queue Identifier field specifies the identifier of a queue. It could be an internal identifier that is only used within a node. Or it could be used by a centralized controller to specify in which specific queue a flow/packet is required to enter.
The Queue Buffer Size field specifies the size of a queue with unit of bytes.
The Flags field is 1 octet in length, and it is designed as follows:
0 1 2 3 4 5 6 7 8 +-+-+-+-+-+-+-+-+ |C|T|H|A| | +-+-+-+-+-+-+-+-+
where:
The RESERVED field is reserved for future use. It MUST be set to 0 when sent and MUST be ignored when received.
Minimum Queuing Delay is 3 octets in length and presents minimum queuing delay value (in microseconds) encoded as an integer value. Implementations may also add this to the value of Min Delay Unidirectional Link Delay Sub-TLV in order to advertise the minimum delay of this link. Min Queuing Delay can be the same with the Max Queuing Delay.
Maximum Queuing Delay is 3 octets in length and presents the maximum queuing delay value (in microseconds) encoded as an integer value. Implementations may also add this to the value of Max Delay Unidirectional Link Delay Sub-TLVto order to advertise the maximum delay of this link.
Maximum Queuing Delay variation is 3 octets in length and presents the maximum queuing delay variation value (in microseconds) encoded as an integer value.
IANA is requested to register the OSPF sub-TLVs defined in this document in the sub-TLVs for Node Attribute TLV registry.
Type Description
---- ------------------------------
TBD1 Packet Processing Delay
TBD2 PREOF Capability
Type Description
---- ------------------------------
TBD3 Maximum DetNet Reservable Bandwidth
TBD4 DetNet Available Bandwidth
TBD5 PREOF Capability
TBD6 Queuing Algorithm Capabilities
TBD7 Queue Parameters
IANA is requested to register the OSPF sub-TLVs defined in this document in the sub-TLVs for Link TLV registry.
IANA is requested to register the ISIS sub-TLVs defined in this document in the sub-TLVs for Router Capability TLV registry.
Type Description
---- ------------------------------
TBD8 Packet Processing Delay
TBD9 PREOF Capability
Type Description
---- ------------------------------
TBD10 Maximum DetNet Reservable Bandwidth
TBD11 DetNet Available Bandwidth
TBD12 PREOF Capability
TBD13 Queuing Algorithm Capabilities
TBD14 Queue Parameters
IANA is requested to register the ISIS sub-TLVs defined in this document in the Sub-TLVs for TLVs 22, 23, 141, 222, and 223 registry.
This document does not introduce security issues beyond those discussed in and.
| [IEEE802.1Q-2014] | "MAC Bridges and VLANs (IEEE 802.1Q-2014)", 2014. |
| [IEEE802.1Qch] | IEEE, "Cyclic Queuing and Forwarding", 2016. |
| [IEEE802.1Qcr] | IEEE, "Asynchronous Traffic Shaping", 2016. |
| [IIEEE802.1Qbv] | IEEE, "Enhancements for Scheduled Traffic", 2016. |
| [RFC3630] | Katz, D., Kompella, K. and D. Yeung, "Traffic Engineering (TE) Extensions to OSPF Version 2", RFC 3630, DOI 10.17487/RFC3630, September 2003. |
| [RFC5305] | Li, T. and H. Smit, "IS-IS Extensions for Traffic Engineering", RFC 5305, DOI 10.17487/RFC5305, October 2008. |
| [RFC5316] | Chen, M., Zhang, R. and X. Duan, "ISIS Extensions in Support of Inter-Autonomous System (AS) MPLS and GMPLS Traffic Engineering", RFC 5316, DOI 10.17487/RFC5316, December 2008. |
| [RFC7310] | Lindsay, J. and H. Foerster, "RTP Payload Format for Standard apt-X and Enhanced apt-X Codecs", RFC 7310, DOI 10.17487/RFC7310, July 2014. |