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Circuits and Tunnels
The terms "Unidirectional Path Switched Ring" and "UPSR" may appear in Cisco literature. These terms
Note
do not refer to using Cisco ONS 15xxx products in a unidirectional path switched ring configuration.
Rather, these terms, as well as "Path Protected Mesh Network" and "PPMN," refer generally to Cisco's
path protection feature, which may be used in any topological network configuration. Cisco does not
recommend using its path protection feature in any particular topological network configuration.
This chapter explains Cisco ONS 15454 SDH high-order and low-order circuits; low-order, data
communication channel (DCC), and IP-encapsulated tunnels; and virtual concatenated (VCAT) circuits.
To provision circuits and tunnels, refer to the Cisco ONS 15454 SDH Procedure Guide.
Chapter topics include:
11.1 Overview, page 11-2
11.2 Circuit Properties, page 11-3
11.3 Cross-Connect Card Bandwidth, page 11-12
11.4 DCC Tunnels, page 11-12
11.5 Multiple Destinations for Unidirectional Circuits, page 11-14
11.6 Monitor Circuits, page 11-14
11.7 SNCP Circuits, page 11-15
11.8 MS-SPRing Protection Channel Access Circuits, page 11-16
11.9 MS-SPRing VC4 Squelch Table, page 11-17
11.10 IEEE 802.17 Resilient Packet Ring Circuit Display, page 11-17
11.11 Section and Path Trace, page 11-18
11.12 Path Signal Label, C2 Byte, page 11-19
11.13 Automatic Circuit Routing, page 11-19
11.14 Manual Circuit Routing, page 11-21
11.15 Constraint-Based Circuit Routing, page 11-25
11.16 Virtual Concatenated Circuits, page 11-26
11.17 Bridge and Roll, page 11-31
11.18 Merged Circuits, page 11-36
11.19 Reconfigured Circuits, page 11-37
78-18119-01
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C H A P T E R
Cisco ONS 15454 SDH Reference Manual, R8.5
11-1

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   Summary of Contents for Cisco ONS 15454 SDH

  • Page 1

    The terms "Unidirectional Path Switched Ring" and "UPSR" may appear in Cisco literature. These terms Note do not refer to using Cisco ONS 15xxx products in a unidirectional path switched ring configuration. Rather, these terms, as well as "Path Protected Mesh Network" and "PPMN," refer generally to Cisco's path protection feature, which may be used in any topological network configuration.

  • Page 2

    11.20 Server Trails, page 11-37 • 11.1 Overview You can create circuits across and within ONS 15454 SDH nodes and assign different attributes to circuits. For example, you can: Create one-way, two-way (bidirectional), or broadcast circuits. VC low-order path tunnels •...

  • Page 3

    Chapter 11 Circuits and Tunnels 11.2 Circuit Properties 11.2 Circuit Properties The ONS 15454 SDH Circuits window, which appears in network, node, and card view, is where you can view information about circuits. The Circuits window (Figure 11-1 on page...

  • Page 4

    (CSV), or tab-separated values (TSV) format using the Export command from the File menu. Figure 11-1 ONS 15454 SDH Circuit Window in Network View 11.2.1 Concatenated VC4 Time Slot Assignments Table 11-1 shows the available time slot assignments for concatenated VC4s when using CTC to provision circuits.

  • Page 5

    Chapter 11 Circuits and Tunnels 11.2.1 Concatenated VC4 Time Slot Assignments Table 11-1 VC4 Mapping Using CTC (continued) Starting VC4-2c VC4-3c VC4-4c VC4-6c VC4-8c VC4-12c VC4-16c VC4-64c Cisco ONS 15454 SDH Reference Manual, R8.5 11-5 78-18119-01...

  • Page 6

    CTC is creating a circuit. DISCOVERED CTC created a circuit. All components are in place and a complete path exists from circuit source to destination. DELETING CTC is deleting a circuit. Cisco ONS 15454 SDH Reference Manual, R8.5 11-6 78-18119-01...

  • Page 7

    Unlocked. If all cross-connects in a circuit are in a Locked state (such as Locked-enabled,maintenance; • Unlocked-disabled,automaticInService; or Locked-enabled,disabled service state) or the Unlocked-disabled,automaticInService state, the circuit service state is Locked. Cisco ONS 15454 SDH Reference Manual, R8.5 11-7 78-18119-01...

  • Page 8

    When the cross-connects in a circuit are in the Unlocked-disabled,automaticInService service state, the ONS 15454 SDH monitors the cross-connects for an error-free signal. It changes the state of the circuit from Locked to Unlocked or to Locked-partial as each cross-connect assigned to the circuit path is completed.

  • Page 9

    MS-SPRing or 1+1 protection group. Y-Cable The circuit is protected by a transponder or muxponder card Y-cable protection group. For more information, refer to the Cisco ONS 15454 DWDM Installation and Operations Guide. 11.2.5 Circuit Information in the Edit Circuit Window You can edit a selected circuit using the Edit button on the Circuits window.

  • Page 10

    Source and destination ports are shown as circles with an S and a D. Port service states are indicated by colors, shown in Table 11-4. Table 11-4 Port State Color Indicators Port Color Service State Green Unlocked-enabled Gray Locked-enabled,disabled Cisco ONS 15454 SDH Reference Manual, R8.5 11-10 78-18119-01...

  • Page 11

    Right-click a port containing a path trace capable card to initiate the path trace. • Right-click an SNCP span to change the state of the path selectors in the SNCP circuit. Cisco ONS 15454 SDH Reference Manual, R8.5 11-11 78-18119-01...

  • Page 12

    It does not use the multiplex section DCCs; therefore, the MS-DCCs are available to tunnel DCCs from third-party equipment across ONS 15454 SDH networks. If D4 through D12 are used as data DCCs, they cannot be used for DCC tunneling.

  • Page 13

    (span) cards. In the example, three tunnel connections are created, one at Node 1 (STM-1 to STM-16), one at Node 2 (STM-16 to STM-16), and one at Node 3 (STM-16 to STM-1). A DCC does not function on a mixed network of ONS 15454 SDH nodes and ONS 15454 nodes. DCC Note tunneling is required for ONS 15454 SDH nodes transporting data through ONS 15454 nodes.

  • Page 14

    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.

  • Page 15

    ONS 15454 SDH that is connected to the third-party network. The second circuit is created on the third-party network so that the circuit travels across the network on two paths to the ONS 15454 SDH nodes. That circuit routes the two circuit signals across the network to ONS 15454 SDH nodes that are connected to the network on other side.

  • Page 16

    Provisioning traffic on MS-SPRing protection channels is performed during circuit provisioning. The Protection Channel Access check box appears whenever Fully Protected Path is unchecked on the circuit creation wizard. Refer to the Cisco ONS 15454 SDH Procedure Guide for more information. When provisioning PCA circuits, two considerations are important: If MS-SPRings are provisioned as nonrevertive, PCA circuits are not restored automatically after a •...

  • Page 17

    IEEE 802.17b compliant. The RPR-IEEE for ONS 15454 ML-Series cards is based on the expected IEEE 802.17b-based standard. For more information about IEEE 802.17 RPR, refer to the Cisco ONS 15454 and Cisco ONS 15454 SDH Ethernet Card Software Feature and Configuration Guide, Release 8.0.

  • Page 18

    • CTC does not support the display of Cisco proprietary RPR circuit topologies. Note CTC does not support provisioning or maintenance of IEEE RPR rings. You must use Cisco IOS. Note 11.11 Section and Path Trace SDH J1 and J2 path trace are repeated, fixed-length strings composed of 64 consecutive bytes. You can use the strings to monitor interruptions or changes to circuit traffic.

  • Page 19

    Circuit routing tries to use the shortest path within the user-specified or network-specified • constraints. Low-order tunnels are preferable for low-order circuits because low-order tunnels are considered shortcuts when CTC calculates a circuit path in path-protected mesh networks. Cisco ONS 15454 SDH Reference Manual, R8.5 11-19 78-18119-01...

  • Page 20

    11-6). Traffic is protected while it goes through a network of ONS 15454 SDH nodes. Figure 11-6 Secondary Sources and Destinations Primary source Primary destination Vendor A Vendor B network network Secondary source Secondary destination ONS network Cisco ONS 15454 SDH Reference Manual, R8.5 11-20 78-18119-01...

  • Page 21

    For bidirectional circuits, CTC creates an SNCP connection at the source node that allows traffic to be selected from one of the two sources on the ONS 15454 SDH network. If you check the Fully Path Protected option during circuit creation, traffic is protected within the ONS 15454 SDH network. At the destination, another SNCP connection is created to bridge traffic from the ONS 15454 SDH network to the two destinations.

  • Page 22

    Choose the links of multicard EtherSwitch circuits in a shared packet ring to route the circuit from source to destination back to source (Figure 11-9). Otherwise, a route (set of links) chosen with loops is invalid. Cisco ONS 15454 SDH Reference Manual, R8.5 11-22 78-18119-01...

  • Page 23

    Number of Sources Number of Drops SNCP — — SNCP — — SNCP — — SNCP — — SNCP — — SNCP — — Double SNCP — — Double SNCP — — Cisco ONS 15454 SDH Reference Manual, R8.5 11-23 78-18119-01...

  • Page 24

    Number of Number of Number of Inbound Links Outbound Links Sources Drops Connection Type Intermediate Nodes Only — — SNCP — — SNCP — — Double SNCP — — Two way Cisco ONS 15454 SDH Reference Manual, R8.5 11-24 78-18119-01...

  • Page 25

    The required nodes and links constraint is only used during the primary path computation and only for Extended SNCP domains/segments. The alternate path is computed normally; CTC uses excluded nodes/links when finding all primary and alternate paths on Extended SNCPs. Cisco ONS 15454 SDH Reference Manual, R8.5 11-25 78-18119-01...

  • Page 26

    CTC checks the combination to make sure a valid route exists and if it does not, the user must modify the protection type. Figure 11-11 shows an example of common fiber routing. Cisco ONS 15454 SDH Reference Manual, R8.5 11-26 78-18119-01...

  • Page 27

    VCAT circuit for the duration of the failure, leaving the remaining members to carry the traffic. When the failure clears, the member circuit is added back into the VCAT circuit. SW-LCAS cannot Cisco ONS 15454 SDH Reference Manual, R8.5 11-27...

  • Page 28

    Protection switching for LCAS, SW-LCAS, and non-LCAS VCAT circuits might exceed 60ms. Note 11.16.4 VCAT Circuit Size Table 11-13 lists supported circuit rates and number of members for each card. Table 11-13 ONS 15454 SDH Card VCAT Circuit Rates and Members Card Circuit Rate Number of Members CE-100T-8 VC12 1–64...

  • Page 29

    LCAS SW-LCAS Non-LCAS 1. When adding or deleting a member from an LCAS VCAT circuit, Cisco recommends that you first put the member in the OOS-MA,OOG service state to avoid service disruptions. Cisco ONS 15454 SDH Reference Manual, R8.5 11-29...

  • Page 30

    VCG. This allows CTC to determine which routing preferences are permissible. 11.16.5.1 Open-Ended VCAT Protection Table 11-15 summarizes the protection options for open-ended VCAT circuits. Note that members can have different routing preferences. Cisco ONS 15454 SDH Reference Manual, R8.5 11-30 78-18119-01...

  • Page 31

    You can use the bridge and roll feature for maintenance functions such as card or facility replacement, or for load balancing. You can perform a bridge and roll on the following ONS platforms: ONS 15600, ONS 15454, ONS 15454 SDH, and ONS 15310-CL, and ONS 15310-MA. 11.17.1 Rolls Window The Rolls window lists information about a rolled circuit before the roll process is complete.

  • Page 32

    Force Valid Signal—Forces a roll onto the Roll To Circuit destination without a valid signal. If you choose Force Valid Signal, traffic on the circuit that is involved in the roll will be dropped when the roll is completed. Cisco ONS 15454 SDH Reference Manual, R8.5 11-32 78-18119-01...

  • Page 33

    (Figure 11-17 on page 11-34). This roll also • results in a new destination or a new source. Figure 11-15, you can select any available VC4 on Node 1 for a new source. Cisco ONS 15454 SDH Reference Manual, R8.5 11-33 78-18119-01...

  • Page 34

    Figure 11-18 Single Roll from One Circuit to Another Circuit (Source Changes) Node 1 Node 2 Node 3 Node 4 Original leg New leg Cisco ONS 15454 SDH Reference Manual, R8.5 11-34 78-18119-01...

  • Page 35

    If a new segment is created on Nodes 3 and 4 using the Bridge and Roll wizard, the created circuit has Note the same name as the original circuit with the suffix _ROLL**. The circuit source is on Node 3 and the circuit destination is on Node 4. Cisco ONS 15454 SDH Reference Manual, R8.5 11-35 78-18119-01...

  • Page 36

    If you choose to continue, the aligned connections merge successfully into the master circuit, and unaligned connections remain in the original circuits. All connections in the completed master circuit use the original master circuit name. Cisco ONS 15454 SDH Reference Manual, R8.5 11-36 78-18119-01...

  • Page 37

    STS-3c server trail can carry only STS-3c circuits and not three STS-1 circuits. There is no OSPF or any other management information exchange between NEs over a server trail. Note Cisco ONS 15454 SDH Reference Manual, R8.5 11-37 78-18119-01...

  • Page 38

    For a detailed procedure on how to route a VCAT circuit over a server trail, refer “Chapter 6, Create Circuits and VT Tunnels, Section NTP-A264, Create an Automatically Routed VCAT Circuit and Section NTP-A265, Create a Manually Routed VCAT Circuit” in the Cisco ONS 15454 Procedure Guide.

  • Page 39

    For example, if two server trail links are routed over the same fiber, an SRLG attribute can be assigned to these links. SRLG is used by Cisco Transport Manager (CTM) to specify link diversity. If you create multiple server trails from one port, you can assign the same SRLG value to all the links to indicate that they originate from the same port.

  • Page 40

    Chapter 11 Circuits and Tunnels 11.20.2 VCAT Circuit Routing over Server Trails Cisco ONS 15454 SDH Reference Manual, R8.5 11-40 78-18119-01...

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