draft-ietf-ccamp-rwa-wson-encode-09.txt   draft-ietf-ccamp-rwa-wson-encode-10.txt 
Network Working Group G. Bernstein Network Working Group G. Bernstein
Internet Draft Grotto Networking Internet Draft Grotto Networking
Intended status: Standards Track Y. Lee Intended status: Standards Track Y. Lee
Expires: September 2011 D. Li Expires: September 2011 D. Li
Huawei Huawei
W. Imajuku W. Imajuku
NTT NTT
March 8, 2011 March 11, 2011
Routing and Wavelength Assignment Information Encoding for Routing and Wavelength Assignment Information Encoding for
Wavelength Switched Optical Networks Wavelength Switched Optical Networks
draft-ietf-ccamp-rwa-wson-encode-09.txt draft-ietf-ccamp-rwa-wson-encode-10.txt
Status of this Memo Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with the This Internet-Draft is submitted to IETF in full conformance with the
provisions of BCP 78 and BCP 79. provisions of BCP 78 and BCP 79.
Internet-Drafts are working documents of the Internet Engineering Internet-Drafts are working documents of the Internet Engineering
Task Force (IETF), its areas, and its working groups. Note that Task Force (IETF), its areas, and its working groups. Note that
other groups may also distribute working documents as Internet- other groups may also distribute working documents as Internet-
Drafts. Drafts.
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and may be updated, replaced, or obsoleted by other documents at any and may be updated, replaced, or obsoleted by other documents at any
time. It is inappropriate to use Internet-Drafts as reference time. It is inappropriate to use Internet-Drafts as reference
material or to cite them other than as "work in progress." material or to cite them other than as "work in progress."
The list of current Internet-Drafts can be accessed at The list of current Internet-Drafts can be accessed at
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This Internet-Draft will expire on September 8, 2011. This Internet-Draft will expire on September 11, 2011.
Copyright Notice Copyright Notice
Copyright (c) 2011 IETF Trust and the persons identified as the Copyright (c) 2011 IETF Trust and the persons identified as the
document authors. All rights reserved. document authors. All rights reserved.
This document is subject to BCP 78 and the IETF Trust's Legal This document is subject to BCP 78 and the IETF Trust's Legal
Provisions Relating to IETF Documents Provisions Relating to IETF Documents
(http://trustee.ietf.org/license-info) in effect on the date of (http://trustee.ietf.org/license-info) in effect on the date of
publication of this document. Please review these documents publication of this document. Please review these documents
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1.1. Revision History..........................................4 1.1. Revision History..........................................4
1.1.1. Changes from 00 draft................................4 1.1.1. Changes from 00 draft................................4
1.1.2. Changes from 01 draft................................4 1.1.2. Changes from 01 draft................................4
1.1.3. Changes from 02 draft................................5 1.1.3. Changes from 02 draft................................5
1.1.4. Changes from 03 draft................................5 1.1.4. Changes from 03 draft................................5
1.1.5. Changes from 04 draft................................5 1.1.5. Changes from 04 draft................................5
1.1.6. Changes from 05 draft................................5 1.1.6. Changes from 05 draft................................5
1.1.7. Changes from 06 draft................................5 1.1.7. Changes from 06 draft................................5
1.1.8. Changes from 07 draft................................5 1.1.8. Changes from 07 draft................................5
1.1.9. Changes from 08 draft................................6 1.1.9. Changes from 08 draft................................6
1.1.10. Changes from 09 draft...............................6
2. Terminology....................................................6 2. Terminology....................................................6
3. Resource Pool Accessibility/Availability.......................6 3. Resource Pool Accessibility/Availability.......................6
3.1. Resource Pool Accessibility Sub-TLV......................8 3.1. Resource Pool Accessibility Sub-TLV......................8
3.2. Resource Block Wavelength Constraints Sub-TLV............10 3.2. Resource Block Wavelength Constraints Sub-TLV............10
3.3. Resource Pool State Sub-TLV..............................10 3.3. Resource Pool State Sub-TLV..............................10
3.4. Block Shared Access Wavelength Availability sub-TLV......12 3.4. Block Shared Access Wavelength Availability sub-TLV......12
4. Resource Properties Encoding..................................13 4. Resource Properties Encoding..................................13
4.1. Resource Block Information Sub-TLV.......................13 4.1. Resource Block Information Sub-TLV.......................13
4.2. Input Modulation Format List Sub-Sub-TLV.................14 4.2. Input Modulation Format List Sub-Sub-TLV.................14
4.2.1. Modulation Format Field.............................15 4.2.1. Modulation Format Field.............................15
4.3. Input FEC Type List Sub-Sub-TLV..........................16 4.3. Input FEC Type List Sub-Sub-TLV..........................17
4.3.1. FEC Type Field......................................17 4.3.1. FEC Type Field......................................17
4.4. Input Bit Range List Sub-Sub-TLV.........................19 4.4. Input Bit Range List Sub-Sub-TLV.........................19
4.4.1. Bit Range Field.....................................19 4.4.1. Bit Range Field.....................................19
4.5. Input Client Signal List Sub-Sub-TLV.....................20 4.5. Input Client Signal List Sub-Sub-TLV.....................20
4.6. Processing Capability List Sub-Sub-TLV...................21 4.6. Processing Capability List Sub-Sub-TLV...................21
4.6.1. Processing Capabilities Field.......................21 4.6.1. Processing Capabilities Field.......................21
4.7. Output Modulation Format List Sub-Sub-TLV................23 4.7. Output Modulation Format List Sub-Sub-TLV................23
4.8. Output FEC Type List Sub-Sub-TLV.........................23 4.8. Output FEC Type List Sub-Sub-TLV.........................23
5. Security Considerations.......................................23 5. Security Considerations.......................................23
6. IANA Considerations...........................................24 6. IANA Considerations...........................................24
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Fixed TLV figures and descriptions for consistent sub-sub-TLV Fixed TLV figures and descriptions for consistent sub-sub-TLV
nomenclature. nomenclature.
1.1.9. Changes from 08 draft 1.1.9. Changes from 08 draft
Fixed ordering of fields in second half of sub-TLV example in Fixed ordering of fields in second half of sub-TLV example in
Appendix A.1. Appendix A.1.
Clarifying edits in section 3 on pools, blocks, and resources. Clarifying edits in section 3 on pools, blocks, and resources.
1.1.10. Changes from 09 draft
Fixed the "Block Shared Access Wavelength Availability sub-TLV" of
section 3.4 to use an "RB set field" rather than a single RB ID.
Removed all 1st person idioms.
2. Terminology 2. Terminology
CWDM: Coarse Wavelength Division Multiplexing. CWDM: Coarse Wavelength Division Multiplexing.
DWDM: Dense Wavelength Division Multiplexing. DWDM: Dense Wavelength Division Multiplexing.
FOADM: Fixed Optical Add/Drop Multiplexer. FOADM: Fixed Optical Add/Drop Multiplexer.
ROADM: Reconfigurable Optical Add/Drop Multiplexer. A reduced port ROADM: Reconfigurable Optical Add/Drop Multiplexer. A reduced port
count wavelength selective switching element featuring ingress and count wavelength selective switching element featuring ingress and
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process or via a strictly optical process. process or via a strictly optical process.
WDM: Wavelength Division Multiplexing. WDM: Wavelength Division Multiplexing.
Wavelength Switched Optical Network (WSON): A WDM based optical Wavelength Switched Optical Network (WSON): A WDM based optical
network in which switching is performed selectively based on the network in which switching is performed selectively based on the
center wavelength of an optical signal. center wavelength of an optical signal.
3. Resource Pool Accessibility/Availability 3. Resource Pool Accessibility/Availability
In this section we define the sub-TLVs for dealing with accessibility This section define the sub-TLVs for dealing with accessibility and
and availability of resource blocks within a pool of resources. These availability of resource blocks within a pool of resources. These
include the ResourceBlockAccessibility, ResourceWaveConstraints, and include the ResourceBlockAccessibility, ResourceWaveConstraints, and
RBPoolState sub-TLVs. All these sub-TLVs are concerned with sets of RBPoolState sub-TLVs. All these sub-TLVs are concerned with sets of
resources. As described in [WSON-Info] a resource pool is composed of resources. As described in [WSON-Info] a resource pool is composed of
blocks of resources with similar properties and accessibility blocks of resources with similar properties and accessibility
characteristics. characteristics.
In a WSON node that includes resource blocks (RB) we will want to In a WSON node that includes resource blocks (RB) denoting subsets of
denote subsets these blocks to efficiently describe common properties these blocks allows one to efficiently describe common properties the
the blocks and to describe the structure, if non-trivial, of the blocks and to describe the structure, if non-trivial, of the resource
resource pool. The RB Set field is defined in a similar manner to the pool. The RB Set field is defined in a similar manner to the label
label set concept of [RFC3471]. set concept of [RFC3471].
The information carried in a RB set field is defined by: The information carried in a RB set field is defined by:
0 1 2 3 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 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action |E|C| Reserved | Length | | Action |E|C| Reserved | Length |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RB Identifier 1 | RB Identifier 2 | | RB Identifier 1 | RB Identifier 2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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3.4. Block Shared Access Wavelength Availability sub-TLV 3.4. Block Shared Access Wavelength Availability sub-TLV
Resources blocks may be accessed via a shared fiber. If this is the Resources blocks may be accessed via a shared fiber. If this is the
case then wavelength availability on these shared fibers is needed to case then wavelength availability on these shared fibers is needed to
understand resource availability. understand resource availability.
0 1 2 3 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 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Resource Block ID |I|E| Reserved | |I|E| Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Ingress Available Wavelength Set Field | | RB Set Field |
: : : :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Ingress Available Wavelength Set Field |
: (Optional) :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Egress Available Wavelength Set Field | | Egress Available Wavelength Set Field |
: : : (Optional) :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Resource Block ID:
The 16 bit integer used to identify a particular resource block.
I bit: I bit:
Indicates whether the ingress available wavelength set field is Indicates whether the ingress available wavelength set field is
included (1) or not (0). included (1) or not (0).
E bit: E bit:
Indicates whether the egress available wavelength set field is Indicates whether the egress available wavelength set field is
included (1) or not (0). included (1) or not (0).
RB Set Field:
A Resource Block set in which all the members share the same ingress
or egress fiber or both.
Ingress Available Wavelength Set Field: Ingress Available Wavelength Set Field:
Indicates the wavelengths currently available (not being used) on the Indicates the wavelengths currently available (not being used) on the
ingress fiber to this resource block. ingress fiber to this resource block.
Egress Available Wavelength Set Field: Egress Available Wavelength Set Field:
Indicates the wavelengths currently available (not being used) on the Indicates the wavelengths currently available (not being used) on the
egress fiber from this resource block. egress fiber from this resource block.
4. Resource Properties Encoding 4. Resource Properties Encoding
Within a WSON network element (NE) there may be resources with signal Within a WSON network element (NE) there may be resources with signal
compatibility constraints. Such resources typically come in "blocks" compatibility constraints. Such resources typically come in "blocks"
which contain a group on identical and indistinguishable individual which contain a group on identical and indistinguishable individual
resources. These resource blocks may consist of regenerators, resources. These resource blocks may consist of regenerators,
wavelength converters, etc... Such resource blocks may also wavelength converters, etc... Such resource blocks may also
constitute the network element as a whole as in the case of an constitute the network element as a whole as in the case of an
electro optical switch. In this section we primarily focus on the electro optical switch. This section primarily focused on the signal
signal compatibility and processing properties of such a resource compatibility and processing properties of such a resource block, the
block, the accessibility aspects of a resource in a shared pool, accessibility aspects of a resource in a shared pool, except for the
except for the shared access indicators, were encoded in the previous shared access indicators, were encoded in the previous section.
section.
The fundamental properties of a resource block, such as a regenerator The fundamental properties of a resource block, such as a regenerator
or wavelength converter, are: or wavelength converter, are:
(a)Input constraints (shared ingress, modulation, FEC, bit rate, (a)Input constraints (shared ingress, modulation, FEC, bit rate,
GPID) GPID)
(b)Processing capabilities (number of resources in a block, (b)Processing capabilities (number of resources in a block,
regeneration, performance monitoring, vendor specific) regeneration, performance monitoring, vendor specific)
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |0| | Length = 8 | | Action=0 |0| | Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RB ID = #2 | zero padding | | RB ID = #2 | zero padding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
A.2. Wavelength Conversion Range Sub-TLV A.2. Wavelength Conversion Range Sub-TLV
Example: Example:
We give an example based on figure 1 about how to represent the This example, based on figure 1, shows how to represent the
wavelength conversion range of wavelength converters. Suppose the wavelength conversion range of wavelength converters. Suppose the
wavelength range of input and output of WC1 and WC2 are {L1, L2, L3, wavelength range of input and output of WC1 and WC2 are {L1, L2, L3,
L4}: L4}:
0 1 2 3 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 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
Note: WC Set Note: WC Set
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Action=0 |1| Reserved | Length = 8 | | Action=0 |1| Reserved | Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
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+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Note: wavelength output range Note: wavelength output range
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| 2 | Num Wavelengths = 4 | Length = 8 | | 2 | Num Wavelengths = 4 | Length = 8 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
|Grid | C.S. | Reserved | n for lowest frequency = 1 | |Grid | C.S. | Reserved | n for lowest frequency = 1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
A.3. An OEO Switch with DWDM Optics A.3. An OEO Switch with DWDM Optics
In Figure 2 we show an electronic switch fabric surrounded by DWDM In Figure 2 shows an electronic switch fabric surrounded by DWDM
optics. In this example the electronic fabric can can handle either optics. In this example the electronic fabric can can handle either
G.709 or SDH signals only (2.5 or 10 Gbps). To describe this node we G.709 or SDH signals only (2.5 or 10 Gbps). To describe this node we
have the potential information: have the potential information:
<Node_Info> ::= <Node_ID>[Other GMPLS sub- <Node_Info> ::= <Node_ID>[Other GMPLS sub-
TLVs][<ConnectivityMatrix>...] [<ResourcePool>][<RBPoolState>] TLVs][<ConnectivityMatrix>...] [<ResourcePool>][<RBPoolState>]
In this case there is complete port to port connectivity so the In this case there is complete port to port connectivity so the
<ConnectivityMatrix> is not required. In addition since there are <ConnectivityMatrix> is not required. In addition since there are
sufficient ports to handle all wavelength signals we will not need sufficient ports to handle all wavelength signals the <RBPoolState>
the <RBPoolState> element. element is not needed.
Hence our attention will be focused on the <ResourcePool> sub-TLV: Hence our attention will be focused on the <ResourcePool> sub-TLV:
<ResourcePool> ::= <ResourcePool> ::=
<ResourceBlockInfo>[<ResourceBlockAccessibility>...][<ResourceWaveCon <ResourceBlockInfo>[<ResourceBlockAccessibility>...][<ResourceWaveCon
straints>...] straints>...]
/| +-----------+ +-------------+ +------+ /| +-----------+ +-------------+ +------+
/D+--->| +--->|Tunable Laser|-->| | /D+--->| +--->|Tunable Laser|-->| |
+ e+--->| | +-------------+ | C | + e+--->| | +-------------+ | C |
========>| M| | | ... | o |========> ========>| M| | | ... | o |========>
skipping to change at page 29, line 36 skipping to change at page 29, line 36
| Processing Capabilities List Sub-Sub-TLV | | Processing Capabilities List Sub-Sub-TLV |
: Fixed (non optional) 3R regeneration : : Fixed (non optional) 3R regeneration :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Output Modulation Type List Sub-Sub-TLV | | Output Modulation Type List Sub-Sub-TLV |
: NRZ : : NRZ :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Output FEC Type List Sub-Sub-TLV | | Output FEC Type List Sub-Sub-TLV |
: Standard SDH, G.709 FECs : : Standard SDH, G.709 FECs :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Since we have fixed connectivity to resource block (the electronic Since there is fixed connectivity to resource blocks (the electronic
switch) we get <ResourceBlockAccessibility>: switch) the <ResourceBlockAccessibility> is:
0 1 2 3 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 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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Connectivity=1|Reserved | | Connectivity=1|Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Ingress Link Set Field A #1 | | Ingress Link Set Field A #1 |
: (All ingress links connect to resource) : : (All ingress links connect to resource) :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| RB Set Field A #1 | | RB Set Field A #1 |
 End of changes. 19 change blocks. 
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