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11.4.2 IP-Encapsulated Tunnels

An IP-encapsulated tunnel puts an RS-DCC in an IP packet at a source node and dynamically routes the

packet to a destination node. A traditional DCC tunnel is configured as one dedicated path across a

network and does not provide a failure recovery mechanism if the path is down. An IP-encapsulated

tunnel is a virtual path, which adds protection when traffic travels between different networks.

IP-encapsulated tunneling has the potential of flooding the DCC network with traffic resulting in a

degradation of performance for CTC. The data originating from an IP tunnel can be throttled to a

user-specified rate, which is a percentage of the total RS-DCC bandwidth.

Each ONS 15454 SDH supports up to ten IP-encapsulated tunnels. You can convert a traditional DCC

tunnel to an IP-encapsulated tunnel or an IP-encapsulated tunnel to a traditional DCC tunnel. Only

tunnels in the DISCOVERED status can be converted.

Converting from one tunnel type to the other is service-affecting.

Caution

11.5 Multiple Destinations for Unidirectional Circuits

Unidirectional circuits can have multiple destinations for use in broadcast circuit schemes. In broadcast

scenarios, one source transmits traffic to multiple destinations, but traffic is not returned back to the

source. When you create a unidirectional circuit, the card that does have its receive (Rx) input terminated

with a valid input signal generates a loss of signal (LOS) alarm. To mask the alarm, create an alarm

profile suppressing the LOS alarm and apply it to the port that does not have its Rx input terminated.

11.6 Monitor Circuits

Monitor circuits are secondary circuits that monitor traffic on primary bidirectional circuits. Monitor

circuits can be created on E1 or STM-N cards.

Node 1, a VC4 is dropped from Port 1 of an STM-1 card. To monitor the VC4 traffic, test equipment is

plugged into Port 2 of the STM-1 card and a monitor circuit to Port 2 is provisioned in CTC. Circuit

monitors are one-way. The monitor circuit in

Port 1 of the STM-1 card.

Figure 11-4

VC4 Drop

Class 5

Switch

Test Set

VC4 Monitor

Monitor circuits cannot be used with Ethernet circuits.

Note

Cisco ONS 15454 SDH Reference Manual, R8.5

11-14

VC4 Monitor Circuit Received at an STM-1 Port

ONS 15454 SDH

Node 1

Port 1

STM-1

STM-N

Port 2

Figure 11-4

shows an example of a monitor circuit. At

Figure 11-4

is used to monitor VC4 traffic received by

ONS 15454 SDH

Node 2

STM-N

Chapter 11 Circuits and Tunnels

STM-N

78-18119-01