draft-ietf-ccamp-flexible-grid-ospf-ext-01.txt   draft-ietf-ccamp-flexible-grid-ospf-ext-02.txt 
Network Working Group Xian Zhang CCAMP Working Group Xian Zhang
Internet-Draft Haomian Zheng Internet-Draft Haomian Zheng
Intended status: Informational Huawei Intended status: Standards Track Huawei
Ramon Casellas Ramon Casellas
CTTC CTTC
O. Gonzalez de Dios O. Gonzalez de Dios
Telefonica Telefonica
D. Ceccarelli D. Ceccarelli
Ericsson Ericsson
Expires: June 16, 2015 December 16, 2014 Expires: December 17, 2015 June 17, 2015
GMPLS OSPF-TE Extensions in support of Flexible Grid GMPLS OSPF-TE Extensions in support of Flexible Grid
draft-ietf-ccamp-flexible-grid-ospf-ext-01.txt draft-ietf-ccamp-flexible-grid-ospf-ext-02.txt
Abstract Abstract
This memo describes the OSPF-TE extensions in support of GMPLS This memo describes the OSPF-TE extensions in support of GMPLS
control of networks that include devices that use the new flexible control of networks that include devices that use the new flexible
optical grid. optical grid.
Status of this Memo Status of this Memo
This Internet-Draft is submitted to IETF in full conformance with This Internet-Draft is submitted to IETF in full conformance with
skipping to change at page 1, line 45 skipping to change at page 1, line 45
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Copyright Notice Copyright Notice
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document authors. All rights reserved. document authors. All rights reserved.
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Table of Contents Table of Contents
1. Introduction ................................................ 2 1. Introduction ................................................ 2
2. Terminology ................................................. 3 2. Terminology ................................................. 3
2.1. Conventions Used in this Document ....................... 3 2.1. Conventions Used in this Document ....................... 3
3. Requirements for Flexi-grid Routing .......................... 3 3. Requirements for Flexi-grid Routing .......................... 3
3.1. Available Frequency Ranges .............................. 4 3.1. Available Frequency Ranges .............................. 4
3.2. Application Compliance Considerations ................... 5 3.2. Application Compliance Considerations ................... 5
3.3. Comparison with Fixed-grid DWDM Links ................... 6 3.3. Comparison with Fixed-grid DWDM Links ................... 6
4. Extensions .................................................. 6 4. Extensions .................................................. 7
4.1. ISCD for Flexi-grid..................................... 7 4.1. ISCD for Flexi-grid ..................................... 7
4.2. Available Labels Set Sub-TLV ............................ 7 4.2. Extensions to Port Label Restriction sub-TLV ............ 7
4.2.1. Inclusive/Exclusive Label Range .................... 7 4.3. Available Resource sub-TLV .............................. 8
4.2.2. Inclusive/Exclusive Label Lists .................... 8 4.3.1. Inclusive/Exclusive Label Ranges ................... 9
4.2.3. Bitmap ............................................ 8 4.3.2. Inclusive/Exclusive Label Lists .................... 9
4.3. Extensions to Port Label Restriction sub-TLV ............ 8 4.3.3. Bitmap Label Set ................................... 9
4.4. Examples for Available Label Set Sub-TLV ................ 9 4.4. Examples for Available Resource Sub-TLV ................ 10
5. IANA Considerations ........................................ 10 5. IANA Considerations ........................................ 11
6. Implementation Status....................................... 10 6. Implementation Status ....................................... 11
6.1. Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)11 6.1. Centre Tecnologic de Telecomunicacions de Catalunya (CTTC)12
7. Acknowledgments ............................................ 12 7. Acknowledgments ............................................ 13
8. Security Considerations ..................................... 12 8. Security Considerations ..................................... 13
9. References ................................................. 12 9. References ................................................. 13
9.1. Normative References ................................... 12 9.1. Normative References ................................... 13
9.2. Informative References................................. 12 9.2. Informative References ................................. 13
10. Authors' Addresses ......................................... 14 10. Authors' Addresses ......................................... 15
11. Contributors' Addresses .................................... 14 11. Contributors' Addresses .................................... 15
1. Introduction 1. Introduction
[G.694.1] defines the Dense Wavelength Division Multiplexing (DWDM) [G.694.1] defines the Dense Wavelength Division Multiplexing (DWDM)
frequency grids for Wavelength Division Multiplexing (WDM) frequency grids for Wavelength Division Multiplexing (WDM)
applications. A frequency grid is a reference set of frequencies applications. A frequency grid is a reference set of frequencies
used to denote allowed nominal central frequencies that may be used used to denote allowed nominal central frequencies that may be used
for defining applications. The channel spacing is the frequency for defining applications. The channel spacing is the frequency
spacing between two allowed nominal central frequencies. All of the spacing between two allowed nominal central frequencies. All of the
wavelengths on a fiber should use different central frequencies and wavelengths on a fiber should use different central frequencies and
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Figure 2 - A Link Supports Fixed Wavelengths with 50 GHz Channel Figure 2 - A Link Supports Fixed Wavelengths with 50 GHz Channel
Spacing Spacing
Unlike the fixed-grid DWDM links, on a flexi-grid DWDM link the slot Unlike the fixed-grid DWDM links, on a flexi-grid DWDM link the slot
width of the frequency slot are flexible as described in section 3.1. width of the frequency slot are flexible as described in section 3.1.
That is, the value of m in the formula is uncertain before a That is, the value of m in the formula is uncertain before a
frequency slot is actually allocated. For this reason, the frequency slot is actually allocated. For this reason, the
available frequency slot/ranges need to be advertised for a flexi- available frequency slot/ranges need to be advertised for a flexi-
grid DWDM link instead of the specific "wavelengths" that are grid DWDM link instead of the specific "wavelengths" that are
sufficient for a fixed-grid link. sufficient for a fixed-grid link. Moreover, thus advertisement is
represented by the combination of Central Frequency Granularity and
Slot Width Granularity.
4. Extensions 4. Extensions
As described in [FLEX-FWK], the network connectivity topology As described in [FLEX-FWK], the network connectivity topology
constructed by the links/nodes and node capabilities are the same as constructed by the links/nodes and node capabilities are the same as
for WSON, and can be advertised by the GMPLS routing protocols for WSON, and can be advertised by the GMPLS routing protocols
(refer to section 6.2 of [RFC6163]). In the flexi-grid case, the (refer to section 6.2 of [RFC6163]). In the flexi-grid case, the
available frequency ranges instead of the specific "wavelengths" are available frequency ranges instead of the specific "wavelengths" are
advertised for the link. This section defines the GMPLS OSPF-TE advertised for the link. This section defines the GMPLS OSPF-TE
extensions in support of advertising the available frequency ranges extensions in support of advertising the available frequency ranges
skipping to change at page 7, line 29 skipping to change at page 7, line 34
Switching Capability = Flexi-Grid-LSC Switching Capability = Flexi-Grid-LSC
Encoding Type = lambda [as defined in RFC3471] Encoding Type = lambda [as defined in RFC3471]
When Switching Capability and Encoding fields are set to values When Switching Capability and Encoding fields are set to values
as stated above, the Interface Switching Capability Descriptor MUST as stated above, the Interface Switching Capability Descriptor MUST
be interpreted as in RFC4203 with the optional inclusion of one or be interpreted as in RFC4203 with the optional inclusion of one or
more Switching Capability Specific Information sub-TLVs. more Switching Capability Specific Information sub-TLVs.
4.2. Available Labels Set Sub-TLV The Max LSP Bandwidth can be calculated based on the Max Slot
Width defined in Available Resource sub-TLV in Section 4.3, together
As described in section 3.1, the available frequency ranges other with corresponding modulation schemes.
than the available frequency slots should be advertised for the
flexi-grid DWDM links. The label encoding defined in [FLEX-LBL] is
used to encode the label field in Available Labels Set sub-TLV [GEN-
Encode].
4.2.1. Inclusive/Exclusive Label Range
The inclusive/exclusive label ranges format of the Available Labels
Set sub-TLV defined in [GEN-ENCODE] can be used for specifying the
frequency ranges of the flexi-grid DWDM links.
Note that multiple Available Labels Set sub-TLVs may be needed if
there are multiple discontinuous frequency ranges on a link.
4.2.2. Inclusive/Exclusive Label Lists
The inclusive/exclusive label lists format of Available Labels Set
sub-TLV defined in [GEN-ENCODE] can be used for specifying the
available central frequencies of flexi-grid DWDM links.
4.2.3. Bitmap
The bitmap format of Available Labels Set sub-TLV defined in [GEN-
ENCODE] can be used for specifying the available central frequencies
of the flexi-grid DWDM links.
Each bit in the bit map represents a particular central frequency
with a value of 1/0 indicating whether the central frequency is in
the set or not. Bit position zero represents the lowest central
frequency and corresponds to the base label, while each succeeding
bit position represents the next central frequency logically above
the previous.
4.3. Extensions to Port Label Restriction sub-TLV 4.2. Extensions to Port Label Restriction sub-TLV
As described in Section 3.2, a port that supports flexi-grid may As described in Section 3.2, a port that supports flexi-grid may
support only a restricted subset of the full flexible grid. The support only a restricted subset of the full flexible grid. The
Port Label Restriction sub-TLV is defined in [GEN-ENCODE] and [GEN- Port Label Restriction sub-TLV is defined in [GEN-ENCODE]. It can
OSPF]. It can be used to describe the label restrictions on a port. be used to describe the label restrictions on a port. A new
A new restriction type, the flexi-grid Restriction Type, is defined restriction type, the flexi-grid Restriction Type, is defined here
here to specify the restrictions on a port to support flexi-grid. to specify the restrictions on a port to support flexi-grid.
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| MatrixID | RstType = TBA | Reserved | | MatrixID | RstType = TBA | Switching Cap | Encoding |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| C.F.G | S.W.G | Min Width | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Max Width | Reserved | | C.F.G | S.W.G | Min Slot Width |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
MatrixID (8 bits): As defined in [GEN-ENCODE]. MatrixID (8 bits): As defined in [GEN-ENCODE].
RstType (Restriction Type, 8 bits): Takes the value (TBD) to RstType (Restriction Type, 8 bits): Takes the value (TBA) to
indicate the restrictions on a port to support flexi-grid. indicate the restrictions on a port to support flexi-grid.
Switching Cap (Switching Capability, 8 bits): As defined in [GEN-
ENCODE], must be consistent with the one specified in ISCD as
described in Section 4.1.
Encoding (8 bits): As defined in [GEN-ENCODE], must be consistent
with the one specified in ISCD as described in Section 4.1.
C.F.G (Central Frequency Granularity, 8 bits): A positive integer. C.F.G (Central Frequency Granularity, 8 bits): A positive integer.
Its value indicates the multiple of 6.25 GHz in terms of central Its value indicates the multiple of 6.25 GHz in terms of central
frequency granularity. frequency granularity.
S.W.G (Slot Width Granularity, 8 bits): A positive integer. Its S.W.G (Slot Width Granularity, 8 bits): A positive integer. Its
value indicates the multiple of 12.5 GHz in terms of slot width value indicates the multiple of 12.5 GHz in terms of slot width
granularity. granularity.
Min Width (8 bits): A positive integer. Its value indicates the Min Slot Width (16 bits): A positive integer. Its value indicates
multiple of 12.5 GHz in terms of the supported minimal slot width. the multiple of 12.5 GHz in terms of the supported minimal slot
width.
Max Width (16 bits): A positive integer. Its value indicates the 4.3. Available Resource sub-TLV
multiple of 12.5 GHz in terms of the supported maximal slot width.
4.4. Examples for Available Label Set Sub-TLV The Available Resource sub-TLV is defined to support indicating the
flexi-grid label availability as follow:
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
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Pri | Max Slot Width | Reserved |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Label Set Field |
: :
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
Pri (priority flags): can be referred to Section 2.4 of [GEN-ENCODE].
Max Slot Width (16 bits): A positive integer. Its value indicates
the multiple of 12.5 GHz in terms of the supported maximal slot
width.
Label Set Field: the definition of Label Set Field can be referred
to Section 2.6 of [GEN-ENCODE]. According to the possible action
value, the usage of Label Set Field is described as the following
sections, respectively.
4.3.1. Inclusive/Exclusive Label Ranges
The inclusive/exclusive label ranges format of the Label Set Field
defined in [GEN-ENCODE] can be used for specifying the frequency
ranges of the flexi-grid DWDM links.
Note that multiple Available Resource sub-TLVs may be needed if
there are multiple discontinuous frequency ranges on a link.
4.3.2. Inclusive/Exclusive Label Lists
The inclusive/exclusive label lists format of Available Labels Set
sub-TLV defined in [GEN-ENCODE] can be used for specifying the
available central frequencies of flexi-grid DWDM links.
4.3.3. Bitmap Label Set
The bitmap format of Available Labels Set sub-TLV defined in [GEN-
ENCODE] can be used for specifying the available central frequencies
of the flexi-grid DWDM links
Each bit in the bit map represents a particular central frequency
with a value of 1/0 indicating whether the central frequency is in
the set or not. Bit position zero represents the lowest central
frequency and corresponds to the base label, while each succeeding
bit position represents the next central frequency logically above
the previous.
Examples of the Available Resource sub-TLV can be found in Section
4.4.
4.4. Examples for Available Resource Sub-TLV
Figure 3 shows an example of available frequency range of a flexi- Figure 3 shows an example of available frequency range of a flexi-
grid DWDM link. grid DWDM link.
-9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11 -9 -8 -7 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 8 9 10 11
...+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--... ...+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--+--...
|--Available Frequency Range--| |--Available Frequency Range--|
Figure 3 - Flexi-grid DWDM Link Figure 3 - Flexi-grid DWDM Link
The symbol '+' represents the allowed nominal central frequency. The The symbol '+' represents the allowed nominal central frequency. The
symbol "--" represents a 6.25 GHz frequency unit. The number on the symbol "--" represents a 6.25 GHz frequency unit. The number on the
top of the line represents the 'n' in the frequency calculation top of the line represents the 'n' in the frequency calculation
formula (193.1 + n * 0.00625). The nominal central frequency is formula (193.1 + n * 0.00625). The nominal central frequency is
193.1 THz when n equals zero. 193.1 THz when n equals zero.
The usage of Action, Number of Labels and Length session of the
Label set field can be referred to Section 2.6 in [GEN-ENCODE].
Assume that the central frequency granularity is 6.25GHz, the label Assume that the central frequency granularity is 6.25GHz, the label
set can be encoded as follows: set can be encoded as follows:
Inclusive Label Range: Inclusive Label Range:
o Start Slot = -2; o Start Slot = -2;
o End Slot = 8. o End Slot = 8.
The available central frequencies (-1, 0, 1, 2, 3, 4, 5, 6, 7) can The available central frequencies (-1, 0, 1, 2, 3, 4, 5, 6, 7) can
be deduced by the Inclusive Label Range, because the Central be deduced by the Inclusive Label Range, because the Central
skipping to change at page 13, line 6 skipping to change at page 14, line 6
Switching Routers", draft-farrkingel-ccamp-flexigrid- Switching Routers", draft-farrkingel-ccamp-flexigrid-
lambda-label, work in progress. lambda-label, work in progress.
9.2. Informative References 9.2. Informative References
[RFC6163] Y. Lee, G. Bernstein and W. Imajuku, "Framework for GMPLS [RFC6163] Y. Lee, G. Bernstein and W. Imajuku, "Framework for GMPLS
and Path Computation Element (PCE) Control of Wavelength and Path Computation Element (PCE) Control of Wavelength
Switched Optical Networks (WSONs)", RFC 6163, April 2011. Switched Optical Networks (WSONs)", RFC 6163, April 2011.
[FLEX-SIG] F.Zhang et al, "RSVP-TE Signaling Extensions in support [FLEX-SIG] F.Zhang et al, "RSVP-TE Signaling Extensions in support
of Flexible-grid", draft-zhang-ccamp-flexible-grid-rsvp- of Flexible-grid", draft-ietf-ccamp-flexible-grid-rsvp-
te-ext, work in progress. te-ext, work in progress.
[FLEX-FWK] Gonzalez de Dios, O,, Casellas R., Zhang, F., Fu, X., [FLEX-FWK] Gonzalez de Dios, O,, Casellas R., Zhang, F., Fu, X.,
Ceccarelli, D., and I. Hussain, "Framework and Ceccarelli, D., and I. Hussain, "Framework and
Requirements for GMPLS based control of Flexi-grid DWDM Requirements for GMPLS based control of Flexi-grid DWDM
networks', draft-ogrcetal-cammp-flexi-grid-fwk, work in networks', draft-ietf-ccamp-flexi-grid-fwk, work in
progress. progress.
[WSON-OSPF] Y. Lee and G. Bernstein, "GMPLS OSPF Enhancement for [WSON-OSPF] Y. Lee and G. Bernstein, "GMPLS OSPF Enhancement for
Signal and Network Element Compatibility for Wavelength Signal and Network Element Compatibility for Wavelength
Switched Optical Networks ", draft-ietf-ccamp-wson-signal- Switched Optical Networks ", draft-ietf-ccamp-wson-signal-
compatibility-ospf, work in progress. compatibility-ospf, work in progress.
10. Authors' Addresses 10. Authors' Addresses
Xian Zhang Xian Zhang
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