Chapter 5, Ring Provisioning

Table Of Contents

Ring Provisioning

5.1 UPSR Topology

5.2 UPSR Cross-Connections

5.3 Ring-to-Ring Interconnection

5.3.1 Sample UPSR to UPSR Connection

5.3.2 Sample UPSR to Two-Fiber BLSR Connection

5.3.3 Sample Two-Fiber BLSR to UPSR Connection

5.3.4 Sample Two-Fiber BLSR to Two-Fiber BLSR Connection

5.3.5 Sample Two-Fiber BLSR to Four-Fiber BLSR Connection

5.3.6 Sample UPSR to Four-Fiber BLSR Connection

5.4 1WAY Drop and Continue

5.4.1 Sample Node 1 Configuration (Source Node)

5.4.2 Sample Node 2 Configuration (Drop and Continue Node)

5.4.3 Sample Node 3 Configuration (Destination Node)

Ring Provisioning

This chapter provides information and sample procedures for setting up STS or VT circuits over existing unidirectional path switched ring (UPSR) and bidirectional line switch ring (BLSR) configurations using TL1, including:

•UPSR topology

•UPSR cross-connections

•Ring-to-ring interconnection

•1WAY drop and continue

Note Because the ONS 15454 implements logical UPSR, there are no defined east and west ports. Instead, the east STS path for one circuit can exit a different port than the east STS path of another circuit, even though the west STS paths for both circuits may share the same port.

5.1 UPSR Topology

No special configuration of the physical UPSR topology is required other than connecting the fibers to the desired ports on the desired nodes. The east and west paths must exit a node at different ports (to ensure link diversity), but there are no other physical topology restrictions

ONS 15xxx networks give you the option to set up path-protected mesh networks (PPMNs). PPMNs extend the protection scheme of a UPSR from the basic ring configuration to the meshed architecture of several interconnected rings. For more information about PPMN refer to "SONET Topologies" in the Cisco ONS 15454 Installation and Operations Guide.

5.2 UPSR Cross-Connections

To create a UPSR cross-connection using TL1, you only need to designate whether it is a 1WAY or 2WAY cross-connect, but the access identifier (AID) must be more explicit. For example, to create a 1WAY UPSR circuit over the network with nodes A, B, C, and D and segments A-B, B-D, A-C, C-D as shown in Figure 5-1, enter the following commands:

ENT-CRS-STS1:A:FROM,TO1&TO2:CTAG1::1WAY;
ENT-CRS-STS1:B:FROM,TO:CTAG2::1WAY;
ENT-CRS-STS1:C:FROM,TO:CTAG3::1WAY;
ENT-CRS-STS1:D:FROM1&FROM2,TO:CTAG4::1WAY;

Figure 5-1 Network configured with a 1WAY UPSR circuit

5.3 Ring-to-Ring Interconnection

In the following examples, the form "5/1/1" represents "Slot 5, Port 1, STS 1." For VTs add the normal VT Group and VT ID extensions. These examples also assume that the slots/ports have been auto-provisioned (via a plug-in event) and that the ports involved have been placed into the in service state using a port configuration command, for example, ED-OCN.

For the examples in this section, both rings traverse the same node; therefore, only a single cross-connection is required to create the ring-to-ring connection. Use the network map shown in Figure 5-2 with the node named "Cisco" in the nexus.

Figure 5-2 Network map with Cisco node showing ring-to-ring interconnection

5.3.1 Sample UPSR to UPSR Connection

Ring 1 = UPSR

Ring 2 = UPSR

This example, illustrated in Figure 5-3, uses a 4-port OC-3 to feed Ring 2. Ring 1 can have any OC-N trunk card, but the trunk card is most likely a single-port OC-48 or OC-12.

Note STS 12/3/2 maps to STS-12-8 (((3-1)*3) +2).
The STS calculation formula is: (((Port # -1)*Number of STS per port)+STS#).

Figure 5-3 UPSR to UPSR connection specifications through the Cisco node

Use the ENT-CRS-STS1:CISCO:STS-5-1&STS-6-1,STS-12-8&STS-13-8:CTAG1::2WAY; input format.

This command creates a selector between 5/1/1 and 6/1/1 which is bridged to Ring 2 (12/3/2 and 13/3/2), as shown in Figure 5-4.

Figure 5-4 Selector between 5/1/1 and 6/1/1

The command also creates a selector between 12/3/2 and 13/3/2 to a bridge to Ring 1 (5/1/1 and 6/1/1), as shown in Figure 5-5.

Figure 5-5 Selector between 12/3/2 and 13/3/2

5.3.2 Sample UPSR to Two-Fiber BLSR Connection

Ring 1 = UPSR

Ring 2 = Two-fiber BLSR

This example, illustrated in Figure 5-6, uses a UPSR end-point with a drop on a two-fiber BLSR and the west span of the two-fiber BLSR (Ring 2) for the active path of the circuit. The example also uses multiport addressing for Ring 2 even though a two-fiber BLSR cannot traverse OC-3 and OC-3 is the only multiport card for Release 3.1. This example is based on the future release of a multiport OC-12 that will support two-fiber BLSR. Therefore, assume a 4-port OC-12 card (this is only important for computing the STS AID for multiport cards) where 13/3/2 = STS-13-26 and where
26 = (((3-1)*12) +2).

Figure 5-6 UPSR to two-fiber BLSR

Use the ENT-CRS-STS1:CISCO:STS-5-1&STS-6-1,STS12-26:CTAG2::2WAY; input format.

This command creates a selector between 5/1/1 and 6/1/1 which connects to 12/3/2 on Ring 2, as shown in Figure 5-7.

Figure 5-7 Selector between 5/1/1 and 6/1/1

The command also creates a bridge from 12/3/2 to Ring 1 (5/1/1 and 6/1/1), as shown in Figure 5-8.

Figure 5-8 Bridge from 12/3/2 to Ring 1

In this configuration a two-fiber BLSR switch can automatically reconnect the selector output to the protection path on the east port (12/3/2 assuming OC-12) if necessary.

5.3.3 Sample Two-Fiber BLSR to UPSR Connection

Ring 1 = Two-fiber BLSR

Ring 2 = UPSR

This example, illustrated in Figure 5-9, uses a UPSR end-point with a drop on a two-fiber BLSR and uses the east span of the two-fiber BLSR (Ring 1) for the active path of the circuit. For STS addressing, the UPSR is an OC-3 (e.g. STS-13-8).

Figure 5-9 Two-fiber BLSR to UPSR

Use the ENT-CRS-STS1:CISCO:STS-6-1,STS-12-8&STS-13-8:CTAG3::2WAY; input format.

This command creates a bridge from 6/1/1 to Ring 2 (12/3/2 and 13/3/2), as shown in Figure 5-10.

Figure 5-10 Bridge from 6/1/1 to Ring 2

The command also creates a selector between 12/3/2 and 13/3/2 to Ring 1 (6/1/1) as shown in Figure 5-11.

Figure 5-11 Selector between 12/3/2 and 13/3/2 to Ring 1

5.3.4 Sample Two-Fiber BLSR to Two-Fiber BLSR Connection

Ring 1 = Two-fiber BLSR

Ring 2 = Two-fiber BLSR

All protection for a two-fiber BLSR interconnecting to a two-fiber BLSR is performed at the line level. You can make the connection with a 2WAY cross-connect from an STS on the working side of the two-fiber BLSR span of Ring 1 to an STS on the working side of a two-fiber BLSR span on Ring 2. The connections can be east to east, east to west, west to east, and west to west. This example, illustrated in Figure 5-12, uses Ring 1 west to Ring 2 east and assumes a 4-port OC-12 in Slots 12 and 13 for subtending to a two-fiber BLSR (Ring 2).

Figure 5-12 Two-fiber BLSR to two-fiber BLSR

Use the ENT-CRS-STS1:CISCO:STS-5-1,STS-13-26:CTAG4::2WAY; input format.

This command creates a 2WAY connection from 5/1/1 to 13/3/2 as shown in Figure 5-13.

Figure 5-13 2WAY connection from 5/1/1 to 13/3/2

5.3.5 Sample Two-Fiber BLSR to Four-Fiber BLSR Connection

Ring 1 = Two-fiber BLSR

Ring 2 = Four-fiber BLSR

All protection for a two-fiber BLSR interconnecting to a four-fiber BLSR is performed at the line level. You can make the connection with a simple 2WAY cross-connection from the appropriate side, east or west, of the two-fiber BLSR to the working fiber of the appropriate side, east or west, of the four-fiber BLSR, as shown in Figure 5-14.

Figure 5-14 Two-fiber BLSR to four-fiber BLSR

Use the ENT-CRS-STS1:CISCO:STS-1-1,STS-5-1:CTAG5::2WAY; input format.

This command creates a 2WAY connection from 1/1/1 to 5/1/1, as shown in Figure 5-15.

Figure 5-15 2WAY Connection from 1/1/1 to 5/1/1

In the event of a failure, the software will automatically switch the traffic to the appropriate line and path.

5.3.6 Sample UPSR to Four-Fiber BLSR Connection

Ring 1 = UPSR

Ring 2 = Four-fiber BLSR

This example uses the west span of the four-fiber BLSR (Ring 2) for the active path of the circuit. The example also assumes that the four-fiber BLSR travels over OC-192 spans, as shown in Figure 5-16.

Figure 5-16 UPSR to four-fiber BLSR

Use the ENT-CRS-STS1:CISCO:STS-1-1&STS-2-1&STS-5-190:CTAG6::2WAY; input format.

This command creates a selector between 1/1/1 and 2/1/1 to Ring 2 (5/1/190), as shown in Figure 5-17.

Figure 5-17 Selector between 1/1/1 and 2/1/1 to Ring 2 (5/1/190)

The command also creates a bridge from 5/1/190 to Ring 1 (1/1/1 and 2/1/1), as shown in Figure 5-18.

Figure 5-18 Bridge from 5/1/190 to Ring 1 (1/1/1 and 2/1/1)

5.4 1WAY Drop and Continue

The following examples show how to create a 1WAY drop and continue cross-connect. The examples use three nodes (Node 1, Node 2, and Node 3) in a ring configuration. Node 1 is the source node, Node 2 has the drop and continue, and Node 3 is the destination.

Figure 5-19 1WAY drop and continue

5.4.1 Sample Node 1 Configuration (Source Node)

Issue the ENT-CRS-STSn::STS-1-1,STS-5-1&STS-6-1:CTAG::1WAY; command on this Node 1.

Figure 5-20 Bridge from 1/1/1 to 5/1/1 and 6/1/1

5.4.2 Sample Node 2 Configuration (Drop and Continue Node)

Issue the ENT-CRS-STSn::STS-5-1&STS-6-1,STS-1-1:CTAG::1WAYDC; on this Node 2.

Figure 5-21 Selector between 5/1/1 and 6/1/1 to 1/1/1

5.4.3 Sample Node 3 Configuration (Destination Node)

Issue the ENT-CRS-STSn::STS-5-1&STS-6-1,STS-1-1:CTAG::1WAY; on this Node 3.

Figure 5-22 Selector between 5/1/1 and 6/1/1 to 1/1/1