Multi Domain Traffic Engineered Transport
Networks (E-OTN, PTN) supporting P2P,
P2MP, RMP and MP2MP Ethernet Services
An overview of architecture and
functionality in terms of 802.1Q modelling
Maarten Vissers
2010-07-15
Introduction
E-OTN and PTN are multi domain, traffic
engineered transport networks which support
P2P, P2MP, RMP and MP2MP Ethernet services
OTN network contains multiple OTN carrier
networks
OTN carrier networks contain OTN access, metro
and core domains
OTN network contains OTN network termination
(NT), electrical switching and optical switching
(SW) equipment
OTN equipment at edge of domains is extended
with Ethernet Switch functionality
EOTN example
OTN Access
Ethernet
Switch
OE
OE
N-degree ROADM
OCH XC/ADM
N-degree ROADM
NT
OEO
OEO
OEO
ODU XC
OE
OE
ODU XC
OEO
OEO
OEO
OE
OE
NT
OE
OE
OE
OE
NT
OE
OE
OCH XC/ADM
N-degree ROADM
OTN Core
OE
OE
OE
OE
OCH
XC/ADM
OCH
XC
Ethernet
Switch
OE
OE
ODU
ODU
ODU
OEO
OEO
OEO
OEO
OEO
OEO
OE
OE
OEO
OEO
OEO
OE
OE
NT
OTN Metro
ODU XC
OE
OE
OE
OE
OE
OE
OE
OE
ODU
ODU
ODU
NT
OEO
OEO
OEO
OCH XC
N-degree ROADM
N-degree ROADM
OE
OE
OCH XC/ADM
N-degree ROADM
OE
OE
OCH
XC/ADM
OCH
XC
N-degree ROADM
OEO
OEO
OEO
MAC
MAC
Relay
Relay
functions
functions
are
interconnected via OTN
ODU
ODU
connections
connections
or Sor I-Tagged LANs
N-degree ROADM
OCH XC/ADM
N-degree ROADM
OTN Network
Termination
OCH XC
N-degree ROADM
OCH XC
OCH XC/ADM
NT
OEO
OEO
OEO
N-degree ROADM
OE
OE
OE
OE
ODU XC
OEO
OEO
OEO
OCH XC
N-degree ROADM
OE
OE
OE
OE
ODU XC
OEO
OEO
OEO
OE
OE
Ethernet
Switch
ODU
ODU
ODU
OEO
OEO
OEO
OE
OE
OEO
OEO
OEO
OE
OE
ODU XC
OE
OE
OE
OE
OTN Metro
OEO
OEO
OEO
OE
OE
ODU
ODU
ODU
NT
OE
OE
OE
OE
Ethernet
Switch
OE
OE
NT
OCH XC
N-degree ROADM
OCH XC/ADM
NT
NT
MAC
MAC
Relay
Relay
functions
functions
are
interconnected via OTN
ODU connections
NT
Ethernet
Network
Termination
NT
Hybrid Ethernet &
OTN Network
Termination
SW
OTN/EOTN
Switch
Ethernet functionality in EOTN SW
ETH VC MAC Relay function
Includes support for G.8031 Ethernet SNC protection
OTN Network Ports
Ethernet MEP and MIP functions
Includes support for Y.1731 Ethernet OAM and G.8021 OAM processing
Ethernet to OTN (de)mapping functions:
Support of the EISS  Question: which Tag to use?
Support of the ISS by additional technologies  GFP-F/OTN
Frame filtering (8.6.3)
EISS
Up MPs (6.17, 19.2, 19.3)
EISS
Port filtering entities (8.6.1/2/4/5)
EISS
Down MPs (6.17, 19.2, 19.3)
EISS
Linktrace Output Multiplexer (19.5)
EISS
Queuing entities (8.6.6/7/8)
EISS
Bridge Port
Transmit and
Receive (8.5)
not present
Support of the EISS
ISS
Support of the ISS by additional
technologies (6.15)
OTN ODU Down MP
OTN other functions
EISS
O
T
N
N
E
T
W
O
R
K
P
O
R
T
s
Up MPs (6.17, 19.2, 19.3)
EISS
Port filtering entities (8.6.1/2/4/5)
EISS
Down MPs (6.17, 19.2, 19.3)
EISS
Linktrace Output Multiplexer (19.5)
EISS
Queuing entities (8.6.6/7/8)
EISS
Support of the EISS
ISS
Support of the ISS by additional
technologies (6.15)
OTN ODU Down MP
OTN other functions
Supports
G.8031 SNC
Protection
Supports
Y.1731 OAM
6.9 like
(VLAN Tag)
or 6.18 like
(I-Tag) ?
GFP-F
Ethernet functionality in EOTN SW
ETH VC Tag choice
16
New VLAN Tag
4-octets
TPID = xxx
3
1
PCP
DEI
ETH VC Tag with 12-bit ETH VC ID (VID); TPMR Reserved
Address transparency; EtherType 89-10 deals with ETH VC
frames with network MAC addresses (N-DA, S-DA)
12
ETH VC ID
I-Tag with 24-bit I-SID; UCA-bit deals with ETH VC frames
with or without network MAC addresses (N-DA, S-DA)
TPID = 88-E7
PCP
1 1 1
RES1
I-Tag
18-octets
3
DEI
UCA
16
2
RES2
24
I-SID
DA
SA
Either Tag is terminated in the “Support of the EISS”
functions
vlan_identifier parameter represents in EM_UNITDATA the 12bit VC ID or 24-bit I-SID
Existing devices already support ETH VC Tag with 12-bit VC
ID; EtherType is configurable;
802.1Q to be extended with additional VLAN Tag type in clause 9.5
Reuse of clause 6.9 ‘Support of the EISS’ possible
Connecting EOTN SW to PEB NT
Operators will reuse existing PEB type NT nodes
EOTN SW nodes are required to connect to such
PEB NT
Solution is to use PNP port in EOTN SW
Frame filtering (8.6.3)
EISS
P
N
P
Up MPs (6.17, 19.2, 19.3)
EISS
Up MPs (6.17, 19.2, 19.3)
EISS
Port filtering entities (8.6.1/2/4/5)
EISS
Port filtering entities (8.6.1/2/4/5)
EISS
Down MPs (6.17, 19.2, 19.3)
EISS
Down MPs (6.17, 19.2, 19.3)
EISS
Linktrace Output Multiplexer (19.5)
EISS
Queuing entities (8.6.6/7/8)
EISS
Support of the EISS (6.9)
ISS
PEB
EISS
N
Linktrace Output Multiplexer (19.5) E
T
EISS
W
Queuing entities (8.6.6/7/8)
O
EISS
R
Support of the EISS
K
ISS
Support of the ISS (6.7)
Support of the ISS by additional
technologies (6.15)
MAC
OTN ODU Down MP
S-Tagged LAN
O
T
N
OTN other functions
P
O
R
T
Connecting an EOTN SW to an I-BEB NT
Operators will reuse existing I-BEB type NT nodes
EOTN SW nodes are required to connect to such I-BEB NT
Solution is to use a new port in EOTN, which terminates ITag
Clause 16.8 like function provides this functionality
Frame filtering (8.6.3)
EISS
N
E
W
6.18 terminates
the I-Tag and
provides
‘N x ISS’ = EISS
I-BEB
P
O
R
T
EISS
Up MPs (6.17, 19.3)
EISS
Up MPs (6.17, 19.2, 19.3)
EISS
Port filtering entities (8.6.1/2/4/5)
EISS
Port filtering entities (8.6.1/2/4/5)
EISS
Down MPs (6.17, 19.3)
EISS
Down MPs (6.17, 19.2, 19.3)
EISS
Linktrace Output Multiplexer (19.5)
EISS
Queuing entities (8.6.6/7/8)
EISS
Support of the I-EISS (6.18 like)
ISS
N
Linktrace Output Multiplexer (19.5) E
T
EISS
W
Queuing entities (8.6.6/7/8)
O
EISS
R
Support of the EISS
K
ISS
Support of the ISS (6.7)
Support of the ISS by additional
technologies (6.15)
MAC
OTN ODU Down MP
I-Tagged LAN
O
T
N
OTN other functions
P
O
R
T
Ethernet functionality in EOTN NT
UNI-N or V-UNI-N interface ports
UNI/V-UNI Facing Port (e.g. CEP, CNP, RCAP+PAP+CEP,
RCAP+PAP+CNP, …)
(V-)UNI LAN termination
Ethernet MEP and MIP functions
Service selection (MAC Relay)
Ethernet VC Network Port (e.g. PEP+CNP, …)
Traffic conditioning (c8.6.5)
Service encapsulation
Ethernet MEPs
ETH VC MAC Relay function
Includes support for G.8031 Ethernet SNC protection
OTN Network Ports
Ethernet MEP and MIP functions
Ethernet to OTN (de)mapping functions:
Support of the EISS  Question: which Tag to use?
Support of the ISS by additional technologies  GFP-F/OTN
Ethernet functionality in EOTN NT
EISS
PEPv2 is
backwards
compatible
with PEP
P
E
P
v
2
(8.6.1/2/4/5)
EISS
(6.9, 9.5)
ISS
6.X MAC
encapsulation
shim inserts
TYPE=89-10,
N-SA, N-DA in
a PEPv2
(8.5)
ISS
MAC encaps (6.X)
ISS
(6.14 or 6.7)
Frame filtering (8.6.3)
EISS
Frame filtering
(8.6.3)
CEP
CNP
PEP
v2
CNP
CBP
CEP
PEP
CNP
CNP
Up MPs (6.17, 19.2, 19.3)
EISS
Port filtering entities (8.6.1/2/4/5)
EISS
O
T
N
Down MPs (6.17, 19.2, 19.3)
EISS
C-Tagged, S-Tagged, Portbased and Transparent
peering or client/server
service (*) with optional
MAC encapsulation
I-Tagged
client/server
service
Frame filtering
(8.6.3)
Frame filtering
(8.6.3)
PEP
PAP RCAP
CEP
Frame filtering
(8.6.3)
C-Tagged
peering or
client/server
service
C-Tagged peering or
client/server service
----S-Tagged peering or
client/server service
Transparent peering
service (*)
S-Tagged
peering
service
Port-based
peering or
client/server
service
(*) CNP=CEP; CEP operates in c9.5a mode,
CNP operates in c9.5b mode; CEP can be
operated in Transparent mode as well after
disabling c6.9
N
Linktrace Output Multiplexer (19.5) E
EISS
T
Queuing entities (8.6.6/7/8)
W
EISS
O
Support of the EISS
R
ISS
K
Support of the ISS by additional
technologies (6.15)
OTN ODU Down MP
OTN other functions
P
O
R
T
Ethernet functionality in EOTN NT
New dedicated MAC encapsulation function in a “version 2
PEP”
Top part of PIP function (6.10)
Separated from I-Tag encapsulation
Separation enables alarm suppression
Backwards compatible with existing PEP function
P2P and P2MP services do not require MAC encapsulation
RMP and MP2MP services may be better scalable when
using MAC encapsulation; preferred mode of operation
RMP and MP2MP services with one or more endpoints on
PEB NTs can not deploy MAC encapsulation
RMP and MP2MP services with one or more endpoints on IBEB NTs must deploy MAC encapsulation in EOTN NT
Version 2 PEPs can be deployed in PEB nodes as well
EOTN Summary
EOTN requires a minimal extension of
802.1Q functions and ports
OTN Network Port with additional Support of
the EISS function supporting a Tag associated
with TPMR Reserved Address transparency
Version 2 PEP with MAC encapsulation function
New I-Tagged LAN terminating port with a
clause 6.18 based Support of the EISS function
to interconnect EOTN SW with I-BEB NT
PTN
PTN network contains multiple PTN
carrier networks
PTN carrier networks contain PTN
access, metro and core domains
PTN network contains PTN network
termination (NT), VC switching (VC
SW) and VP switching (VP SW)
equipment
Backup
New VLAN Tag
4-octets
TPID = xxx
16
I-Tag
18-octets
PCP
3
1
PCP
3
TPID = 88-E7
PCP
12
S-/B-VLAN ID
12
ETH VC ID
1 1 1
RES1
16
1
DEI
TPID = 88-A8
3
DEI
UCA
16
S-VLAN Tag
4-octets
DEI
header formats
2
24
RES2
DA
SA
16
cHEC
PLI
PTI
3
PFII
GFP-F header
8-octets
16
EXI
UPI
1
4
12
tHEC
I-SID