Cisco Cisco ONS 15454 SONET Multiservice Provisioning Platform (MSPP) Guía De Diseño
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Manual Cross-Connects
ONS 15454 nodes require end-to-end CTC visibility between nodes for normal provisioning of
Ethernet circuits. When other vendors’ equipment sits between ONS 15454 nodes, OSI/TARP-
based equipment does not allow tunneling of the ONS 15454 TCP/IP-based DCC. To circumvent
this lack of continuous DCC, the Ethernet circuit must be manually cross connected to an STS
channel riding through the other vendors’ network as shown in Figure 5-18. This allows an
Ethernet circuit to run from ONS 15454 node to ONS 15454 node utilizing the other vendors’
network.
ONS 15454 nodes require end-to-end CTC visibility between nodes for normal provisioning of
Ethernet circuits. When other vendors’ equipment sits between ONS 15454 nodes, OSI/TARP-
based equipment does not allow tunneling of the ONS 15454 TCP/IP-based DCC. To circumvent
this lack of continuous DCC, the Ethernet circuit must be manually cross connected to an STS
channel riding through the other vendors’ network as shown in Figure 5-18. This allows an
Ethernet circuit to run from ONS 15454 node to ONS 15454 node utilizing the other vendors’
network.
Figure 15-18: G-Series Manual Cross-connects
SONET
Ethernet
ONS 15454
ONS 15454
Other Vendor's
SONET Network
Router
Router
Transparent LAN Service (TLS)
A TLS is a Virtual Ethernet Connection (VEC) that appears to act as an Ethernet wire, where all
Ethernet traffic is seen by all remote ends. The customer only sees its end devices and the traffic
generated or going through these equipments. In other words, the Metro network devices do not
send any Protocol Data Units (PDUs) to the customer network. The Layer 2 protocols such as
STP, CDP, VTP and EtherChannel must be transported transparently across the TLS as they
would be over “dark fiber”. The Metro network appears as an Ethernet segment to the customer.
In addition, this service must allow any number of customer VLANs to be tunneled together the
Metro network run, so that the customer is not limited by number nor forced by the service
provider to use specific assigned VLANs. This service is a multi-point to multi-point connection
type of service illustrated in Figure 15-19.
Figure 15-19: Transparent LAN Service Architecture
ONS 15454
ONS 15454
ONS 15454
ONS 15454
Gig-E
10/100T
S
S
Customer B
Customer B
Customer A
Customer A
S
S
Gig-E
10/100T
Gig
-E
10
/100T
Gi
g-
E
10/
10
0T
OC-48 BLSR
ONS 15454
ONS 15454
ONS 15454
ONS 15454
Gig-E
10/100T
S
S
S
S
S
S
Customer B
Customer B
Customer A
Customer A
S
S
S
S
S
S
Gig-E
10/100T
Gig
-E
10
/100T
Gi
g-
E
10/
10
0T
OC-48 BLSR
As illustrated on the Figure 5-20, several types of services can be delivered through the same
client network interface with this architecture. The TLS between the corporate office and the