draft-ietf-ccamp-gmpls-routing-01.txt   draft-ietf-ccamp-gmpls-routing-02.txt 
Network Working Group K. Kompella (Juniper Networks) Network Working Group K. Kompella (Juniper Networks)
Internet Draft Y. Rekhter (Juniper Networks) Internet Draft Y. Rekhter (Juniper Networks)
Expiration Date: May 2002 A. Banerjee (Calient Networks) Expiration Date: August 2002 A. Banerjee (Calient Networks)
J. Drake (Calient Networks) J. Drake (Calient Networks)
G. Bernstein (Ciena) G. Bernstein (Ciena)
D. Fedyk (Nortel Networks) D. Fedyk (Nortel Networks)
E. Mannie (GTS Network) E. Mannie (GTS Network)
D. Saha (Tellium) D. Saha (Tellium)
V. Sharma (Metanoia, Inc.) V. Sharma (Metanoia, Inc.)
D. Basak (AcceLight Networks) D. Basak (AcceLight Networks)
Routing Extensions in Support of Generalized MPLS Routing Extensions in Support of Generalized MPLS
draft-ietf-ccamp-gmpls-routing-01.txt draft-ietf-ccamp-gmpls-routing-02.txt
1. Status of this Memo 1. Status of this Memo
This document is an Internet-Draft and is in full conformance with This document is an Internet-Draft and is in full conformance with
all provisions of Section 10 of RFC2026. all provisions of Section 10 of RFC2026.
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.
skipping to change at page 12, line 35 skipping to change at page 12, line 35
[PSC, TDM] - label represents a TDM time slot [GMPLS-SONET-SDH] [PSC, TDM] - label represents a TDM time slot [GMPLS-SONET-SDH]
[PSC, LSC] - label represents a port [PSC, LSC] - label represents a port
[TDM, LSC] - label represents a port [TDM, LSC] - label represents a port
6.4.8. Other issues 6.4.8. Other issues
It is possible that Interface Switching Capability Descriptor will It is possible that Interface Switching Capability Descriptor will
change over time, reflecting the allocation/deallocation of LSPs. change over time, reflecting the allocation/deallocation of LSPs.
For example, assume that STS-1, STS-3c, STS-12c, STS-48c and STS-192c For example, assume that STS-1, STS-3c, STS-12c, STS-48c and STS-192c
LSPs can be established on a OC-192 interface whose Encoding Type is LSPs can be established on a OC-192 interface whose Encoding Type is
SONET (or to be more precise, SONET ANSI T1.105-1995). Thus, SONET (or to be more precise, SONET ANSI T1.105). Thus, initially in
initially in the Interface Switching Capability Descriptor the the Interface Switching Capability Descriptor the Minimum LSP
Minimum LSP Bandwidth is set to STS-1, and Maximum LSP Bandwidth is Bandwidth is set to STS-1, and Maximum LSP Bandwidth is set to
set to STS-192 for all priorities. As soon as an LSP of STS-1 size STS-192 for all priorities. As soon as an LSP of STS-1 size at
at priority 1 is established on the interface, it is no longer priority 1 is established on the interface, it is no longer capable
capable of STS-192c for all but LSPs at priority 0. Therefore, the of STS-192c for all but LSPs at priority 0. Therefore, the node
node advertises a modified Interface Switching Capability Descriptor advertises a modified Interface Switching Capability Descriptor
indicating that the Maximum LSP Bandwidth is no longer STS-192, but indicating that the Maximum LSP Bandwidth is no longer STS-192, but
STS-48 for all but priority 0 (at priority 0 the Maximum LSP STS-48 for all but priority 0 (at priority 0 the Maximum LSP
Bandwidth is still STS-192). If subsequently there is another STS-1 Bandwidth is still STS-192). If subsequently there is another STS-1
LSP, there is no change in the Interface Switching Capability LSP, there is no change in the Interface Switching Capability
Descriptor. The Descriptor remains the same until the node can no Descriptor. The Descriptor remains the same until the node can no
longer establish a STS-48c LSP over the interface (which means that longer establish a STS-48c LSP over the interface (which means that
at this point more than 144 time slots are taken by LSPs on the at this point more than 144 time slots are taken by LSPs on the
interface). Once this happened, the Descriptor is modified again, interface). Once this happened, the Descriptor is modified again,
and the modified Descriptor is advertised to other nodes. and the modified Descriptor is advertised to other nodes.
6.4.9. Examples of Interface Switching Capability Descriptor 6.4.9. Examples of Interface Switching Capability Descriptor
6.4.9.1. STS-48 POS Interface on a LSR 6.4.9.1. STS-48 POS Interface on a LSR
Interface Switching Capability Descriptor: Interface Switching Capability Descriptor:
Interface Switching Capability = PSC-1 Interface Switching Capability = PSC-1
Encoding = SONET ANSI T1.105-1995 Encoding = SONET ANSI T1.105
Max LSP Bandwidth[p] = 2.5 Gbps, for all p Max LSP Bandwidth[p] = 2.5 Gbps, for all p
If multiple links with such interfaces at both ends were to be If multiple links with such interfaces at both ends were to be
advertised as one TE link, link bundling techniques should be used. advertised as one TE link, link bundling techniques should be used.
6.4.9.2. GigE Packet Interface on a LSR 6.4.9.2. GigE Packet Interface on a LSR
Interface Switching Capability Descriptor: Interface Switching Capability Descriptor:
Interface Switching Capability = PSC-1 Interface Switching Capability = PSC-1
Encoding = Ethernet 802.3 Encoding = Ethernet 802.3
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6.4.9.3. OC-192 SONET Interface on a Digital Cross Connect with Standard 6.4.9.3. OC-192 SONET Interface on a Digital Cross Connect with Standard
SONET SONET
Consider a branch of SONET multiplexing tree : VT-1.5, STS-1, STS-3c, Consider a branch of SONET multiplexing tree : VT-1.5, STS-1, STS-3c,
STS-12c, STS-48c, STS-192c. If it is possible to establish all these STS-12c, STS-48c, STS-192c. If it is possible to establish all these
connections on a OC-192 interface, the Interface Switching Capability connections on a OC-192 interface, the Interface Switching Capability
Descriptor of that interface can be advertised as follows: Descriptor of that interface can be advertised as follows:
Interface Switching Capability Descriptor: Interface Switching Capability Descriptor:
Interface Switching Capability = TDM [Standard SONET] Interface Switching Capability = TDM [Standard SONET]
Encoding = SONET ANSI T1.105-1995 Encoding = SONET ANSI T1.105
Min LSP Bandwidth = VT1.5 Min LSP Bandwidth = VT1.5
Max LSP Bandwidth[p] = STS192, for all p Max LSP Bandwidth[p] = STS192, for all p
If multiple links with such interfaces at both ends were to be If multiple links with such interfaces at both ends were to be
advertised as one TE link, link bundling techniques should be used. advertised as one TE link, link bundling techniques should be used.
6.4.9.4. OC-192 SONET Interface on a Digital Cross Connect with two 6.4.9.4. OC-192 SONET Interface on a Digital Cross Connect with two
types of SONET multiplexing hierarchy supported types of SONET multiplexing hierarchy supported
Interface Switching Capability Descriptor 1: Interface Switching Capability Descriptor 1:
Interface Switching Capability = TDM [Standard SONET] Interface Switching Capability = TDM [Standard SONET]
Encoding = SONET ANSI T1.105-1995 Encoding = SONET ANSI T1.105
Min LSP Bandwidth = VT1.5 Min LSP Bandwidth = VT1.5
Max LSP Bandwidth[p] = STS192, for all p Max LSP Bandwidth[p] = STS192, for all p
Interface Switching Capability Descriptor 2: Interface Switching Capability Descriptor 2:
Interface Switching Capability = TDM [Arbitrary SONET] Interface Switching Capability = TDM [Arbitrary SONET]
Encoding = SONET ANSI T1.105-1995 Encoding = SONET ANSI T1.105
Min LSP Bandwidth = VT2 Min LSP Bandwidth = VT2
Max LSP Bandwidth[p] = STS192, for all p Max LSP Bandwidth[p] = STS192, for all p
If multiple links with such interfaces at both ends were to be If multiple links with such interfaces at both ends were to be
advertised as one TE link, link bundling techniques should be used. advertised as one TE link, link bundling techniques should be used.
6.4.9.5. Interface on an opaque OXC (SONET framed) 6.4.9.5. Interface on an opaque OXC (SONET framed)
An "opaque OXC" is considered operationally an OXC, as the whole An "opaque OXC" is considered operationally an OXC, as the whole
lambda (carrying the SONET line) is switched transparently without lambda (carrying the SONET line) is switched transparently without
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A TE link is a group of interfaces on an OXC. All interfaces on a A TE link is a group of interfaces on an OXC. All interfaces on a
given OXC are required to have identifiers unique to that OXC, and given OXC are required to have identifiers unique to that OXC, and
these identifiers are used as port labels (see 3.2.1.1 of [GMPLS- these identifiers are used as port labels (see 3.2.1.1 of [GMPLS-
SIG]). SIG]).
The following is an example of an interface switching capability The following is an example of an interface switching capability
descriptor on a SONET framed opaque OXC: descriptor on a SONET framed opaque OXC:
Interface Switching Capability Descriptor: Interface Switching Capability Descriptor:
Interface Switching Capability = LSC Interface Switching Capability = LSC
Encoding = SONET ANSI T1.105-1995 Encoding = SONET ANSI T1.105
Reservable Bandwidth = Determined by SONET Framer (say OC192) Reservable Bandwidth = Determined by SONET Framer (say OC192)
6.4.9.6. Interface on a transparent OXC (PXC) with external DWDM that 6.4.9.6. Interface on a transparent OXC (PXC) with external DWDM that
understands SONET framing understands SONET framing
This example assumes that DWDM and PXC are connected in such a way This example assumes that DWDM and PXC are connected in such a way
that each interface (port) on the PXC handles just a single that each interface (port) on the PXC handles just a single
wavelength. Thus, even if in principle an interface on the PXC could wavelength. Thus, even if in principle an interface on the PXC could
switch multiple wavelengths as a whole, in this particular case an switch multiple wavelengths as a whole, in this particular case an
interface on the PXC is considered LSC, and not FSC. interface on the PXC is considered LSC, and not FSC.
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given PXC are required to have identifiers unique to that PXC, and given PXC are required to have identifiers unique to that PXC, and
these identifiers are used as port labels (see 3.2.1.1 of [GMPLS- these identifiers are used as port labels (see 3.2.1.1 of [GMPLS-
SIG]). SIG]).
The following is an example of an interface switching capability The following is an example of an interface switching capability
descriptor on a transparent OXC (PXC) with external DWDM that descriptor on a transparent OXC (PXC) with external DWDM that
understands SONET framing: understands SONET framing:
Interface Switching Capability Descriptor: Interface Switching Capability Descriptor:
Interface Switching Capability = LSC Interface Switching Capability = LSC
Encoding = SONET ANSI T1.105-1995 (comes from DWDM) Encoding = SONET ANSI T1.105 (comes from DWDM)
Reservable Bandwidth = Determined by DWDM (say OC192) Reservable Bandwidth = Determined by DWDM (say OC192)
6.4.9.7. Interface on a transparent OXC (PXC) with external DWDM that is 6.4.9.7. Interface on a transparent OXC (PXC) with external DWDM that is
transparent to bit-rate and framing transparent to bit-rate and framing
This example assumes that DWDM and PXC are connected in such a way This example assumes that DWDM and PXC are connected in such a way
that each interface (port) on the PXC handles just a single that each interface (port) on the PXC handles just a single
wavelength. Thus, even if in principle an interface on the PXC could wavelength. Thus, even if in principle an interface on the PXC could
switch multiple wavelengths as a whole, in this particular case an switch multiple wavelengths as a whole, in this particular case an
interface on the PXC is considered LSC, and not FSC. interface on the PXC is considered LSC, and not FSC.
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given PXC are required to have identifiers unique to that PXC, and given PXC are required to have identifiers unique to that PXC, and
these identifiers are used as port labels (see 3.2.1.1 of [GMPLS- these identifiers are used as port labels (see 3.2.1.1 of [GMPLS-
SIG]). SIG]).
The following is an example of an interface switching capability The following is an example of an interface switching capability
descriptor on a transparent OXC (PXC) with external DWDM that is descriptor on a transparent OXC (PXC) with external DWDM that is
transparent to bit-rate and framing: transparent to bit-rate and framing:
Interface Switching Capability Descriptor: Interface Switching Capability Descriptor:
Interface Switching Capability = LSC Interface Switching Capability = LSC
Encoding = Photonic Encoding = Lambda (photonic)
Reservable Bandwidth = Determined by optical technology limits Reservable Bandwidth = Determined by optical technology limits
6.4.9.8. Interface on a PXC with no external DWDM 6.4.9.8. Interface on a PXC with no external DWDM
The absence of DWDM in between two PXCs, implies that an interface is The absence of DWDM in between two PXCs, implies that an interface is
not limited to one wavelength. Thus, the interface is advertised as not limited to one wavelength. Thus, the interface is advertised as
FSC. FSC.
A TE link is a group of interfaces on the PXC. All interfaces on a A TE link is a group of interfaces on the PXC. All interfaces on a
given PXC are required to have identifiers unique to that PXC, and given PXC are required to have identifiers unique to that PXC, and
these identifiers are used as port labels (see 3.2.1.1 of [GMPLS- these identifiers are used as port labels (see 3.2.1.1 of [GMPLS-
SIG]). SIG]).
Interface Switching Capability Descriptor: Interface Switching Capability Descriptor:
Interface Switching Capability = FSC Interface Switching Capability = FSC
Encoding = Photonic Encoding = Lambda (photonic)
Reservable Bandwidth = Determined by optical technology limits Reservable Bandwidth = Determined by optical technology limits
Note that this example assumes that the PXC does not restrict each Note that this example assumes that the PXC does not restrict each
port to carry only one wavelength. port to carry only one wavelength.
6.4.10. Example of interfaces that support multiple switching 6.4.10. Example of interfaces that support multiple switching
capabilities capabilities
There can be many combinations possible, some are described below. There can be many combinations possible, some are described below.
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channel, or the wavelength may be terminated as a SONET interface and channel, or the wavelength may be terminated as a SONET interface and
SONET channels switched. SONET channels switched.
From a GMPLS perspective the PXC+TDM functionality is treated as a From a GMPLS perspective the PXC+TDM functionality is treated as a
single interface. The interface is described using two Interface single interface. The interface is described using two Interface
descriptors, one for the LSC and another for the TDM, with descriptors, one for the LSC and another for the TDM, with
appropriate parameters. For example, appropriate parameters. For example,
Interface Switching Capability Descriptor: Interface Switching Capability Descriptor:
Interface Switching Capability = LSC Interface Switching Capability = LSC
Encoding = SONET ANSI T1.105-1995 (comes from WDM) Encoding = SONET ANSI T1.105 (comes from WDM)
Reservable Bandwidth = OC192 Reservable Bandwidth = OC192
and and
Interface Switching Capability Descriptor: Interface Switching Capability Descriptor:
Interface Switching Capability = TDM [Standard SONET] Interface Switching Capability = TDM [Standard SONET]
Encoding = SONET ANSI T1.105-1995 Encoding = SONET ANSI T1.105
Min LSP Bandwidth = VT1.5 Min LSP Bandwidth = VT1.5
Max LSP Bandwidth[p] = STS192, for all p Max LSP Bandwidth[p] = STS192, for all p
6.4.10.2. Interface on an opaque OXC+TDM device with external DWDM 6.4.10.2. Interface on an opaque OXC+TDM device with external DWDM
An interface on an "opaque OXC+TDM" device would also be advertised An interface on an "opaque OXC+TDM" device would also be advertised
as LSC+TDM much the same way as the previous case. as LSC+TDM much the same way as the previous case.
6.4.10.3. Interface on a PXC+LSR device with external DWDM 6.4.10.3. Interface on a PXC+LSR device with external DWDM
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may be cross-connected by the PXC element to other out-bound optical may be cross-connected by the PXC element to other out-bound optical
channel, or the wavelength may be terminated as a Packet interface channel, or the wavelength may be terminated as a Packet interface
and packets switched. and packets switched.
From a GMPLS perspective the PXC+LSR functionality is treated as a From a GMPLS perspective the PXC+LSR functionality is treated as a
single interface. The interface is described using two Interface single interface. The interface is described using two Interface
descriptors, one for the LSC and another for the PSC, with descriptors, one for the LSC and another for the PSC, with
appropriate parameters. For example, appropriate parameters. For example,
Interface Switching Capability Descriptor: Interface Switching Capability Descriptor:
Interface Switching Capability = LSC Interface Switching Capability = LSC
Encoding = SONET ANSI T1.105-1995 (comes from WDM) Encoding = SONET ANSI T1.105 (comes from WDM)
Reservable Bandwidth = OC192 Reservable Bandwidth = OC192
and and
Interface Switching Capability Descriptor: Interface Switching Capability Descriptor:
Interface Switching Capability = PSC-1 Interface Switching Capability = PSC-1
Encoding = SONET ANSI T1.105-1995 Encoding = SONET ANSI T1.105
Max LSP Bandwidth[p] = 10 Gbps, for all p Max LSP Bandwidth[p] = 10 Gbps, for all p
6.4.10.4. Interface on a TDM+LSR device 6.4.10.4. Interface on a TDM+LSR device
On a TDM+LSR device that offers a channelized SONET/SDH interface the On a TDM+LSR device that offers a channelized SONET/SDH interface the
following may be possible: following may be possible:
- A subset of the SONET/SDH channels may be uncommitted. That is, - A subset of the SONET/SDH channels may be uncommitted. That is,
they are not currently in use and hence are available for they are not currently in use and hence are available for
allocation. allocation.
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That is, they are already allocated by terminate on a packet That is, they are already allocated by terminate on a packet
interface and packets switched. interface and packets switched.
From a GMPLS perspective the TDM+PSC functionality is treated as a From a GMPLS perspective the TDM+PSC functionality is treated as a
single interface. The interface is described using two Interface single interface. The interface is described using two Interface
descriptors, one for the TDM and another for the PSC, with descriptors, one for the TDM and another for the PSC, with
appropriate parameters. For example, appropriate parameters. For example,
Interface Switching Capability Descriptor: Interface Switching Capability Descriptor:
Interface Switching Capability = TDM [Standard SONET] Interface Switching Capability = TDM [Standard SONET]
Encoding = SONET ANSI T1.105-1995 Encoding = SONET ANSI T1.105
Min LSP Bandwidth = VT1.5 Min LSP Bandwidth = VT1.5
Max LSP Bandwidth[p] = STS192, for all p Max LSP Bandwidth[p] = STS192, for all p
and and
Interface Switching Capability Descriptor: Interface Switching Capability Descriptor:
Interface Switching Capability = PSC-1 Interface Switching Capability = PSC-1
Encoding = SONET ANSI T1.105-1995 Encoding = SONET ANSI T1.105
Max LSP Bandwidth[p] = 10 Gbps, for all p Max LSP Bandwidth[p] = 10 Gbps, for all p
7. Security Considerations 7. Security Considerations
The routing extensions proposed in this document do not raise any new The routing extensions proposed in this document do not raise any new
security concerns. security concerns.
8. Acknowledgements 8. Acknowledgements
The authors would like to thank Suresh Katukam, Jonathan Lang and The authors would like to thank Suresh Katukam, Jonathan Lang and
 End of changes. 

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