(CPT 200 and CPT 600 only)

The fabric card is a single slot card with two 10GE SFP+ ports and two 10GE XFP ports. The XFP ports on the fabric card support the Optical Transport Network (OTN) protocol. The SFP+ ports on the fabric card can serve as normal ports or InterConnect (IC) ports. When the SFP+ ports are used as IC ports, these ports are used to connect with the SFP+ ports on the CPT 50 panel.

The fabric card runs the route processor version of IOS. The fabric card manages the line card and the CPT 50 panel through the backplane GE management channel.

When fabric and line cards are installed on the shelf, a bidirectional 2 * 16G connection is set up between each fabric and line card and also between two fabric cards.

In chassis AC type, two fabric and two line cards are supported. In chassis DC type, there is no limit on the cards that are supported.

Circuit creation is possible only at XFP ports of the fabric card. Only OCHTRAIL creation is supported. Before creating the OCHTRAIL, create a provisionable patchcord (PPC) between the XFP port of the fabric card and the OCH port.

Faceplate and Block Diagram

Figure 1 illustrates the faceplate of the fabric card.

The FPGA on the fabric card processes the traffic packets. The console port on the faceplate is used for debugging.

Figure 1. Fabric Card Faceplate

Figure 2 illustrates the CPT system block diagram.

Figure 2. CPT System Block Diagram

(CPT 200 and CPT 600 only)

The line card has four 10GE SFP+ ports. The SFP+ ports on the line card serve as normal ports or InterConnect (IC) ports. When the SFP+ ports are used as IC ports, these ports are used to connect with the SFP+ ports on the CPT 50 panel. The line card runs the line card version of IOS.

When fabric and line cards are installed on the shelf, a bidirectional 2 * 16G connection is set up between each fabric card and each line card and also between two fabric cards.

Faceplate

Figure 1 illustrates the faceplate for the line card. The console port on the faceplate is used for debugging.

Figure 3. Line Card Faceplate

(CPT 200 and CPT 600 only)

The CPT 50 panel enables the number of ports to be scaled on the CPT system. The CPT 50 panel has 4 10GE SFP+ ports and 44 GE SFP ports. The CPT 50 panel runs the line card version of IOS.

Note	The CPT 50 panel is not placed in the CPT 200 or CPT 600 shelf.

Note	The CPT 50 panel should be of REV 5 hardware. To check the hardware, run the following command: show version.

The CPT 50 panel cannot operate independently. After connecting the CPT 50 panel to the fabric card or the line card, the CPT 50 panel is automatically discovered and registered. The discovery operation is performed using the Satellite Discovery Protocol (SDP) and the registration operation is performed using the Satellite Registration Protocol (SRP).

The four SFP+ ports on the CPT 50 panel can be connected to the SFP+ ports on the fabric card or the line card. The four SFP+ ports on the CPT 50 panel can be connected to only one card (fabric or line card) at a time.

CPT 50 shelf supports ONE-GE and FE for 1 to 44 ports. CPT 50 shelf supports TEN-GE for 45 to 48 ports. By default, the 45 to 48 ports are in IC mode and cannot be changed.

The CPT 50 panel has redundant DC feeds. The CPT 50 panel DC power supply can handle 48 V and 24 V. The 48 V power supply has both ANSI and ETSI versions.

The CPT 50 panel has a removable fan tray and a local console port for onsite access and debugging.

TDM SFP on a CPT 50 panel is supported even if the other end of the static pseudowire is connected to a Cisco ASR 9000 Series Router or a Cisco 7600 Series Router.

Faceplate

There are four variations of the CPT 50 panel faceplate:

• CPT 50 panel with AC power. See Figure 1.

• CPT 50 panel with DC ETSI 48 V. See Figure 2.

• CPT 50 panel with DC ANSI 48 V. See Figure 3.

• CPT 50 panel with DC ANSI 24 V. See Figure 4.

Figure 4. CPT 50 panel with AC Power Faceplate

Figure 5. CPT 50 panel with DC ETSI 48 V Faceplate

Figure 6. CPT 50 panel with DC ANSI 48 V Faceplate

Figure 7. CPT 50 panel with DC ANSI 24 V Faceplate

Hardware Restrictions

At any given time, only 12 TDM SFP modules can be connected to a CPT 50 panel. With these modules, 15 SFP modules and 2 SFP+ modules can also be connected. For information about SFP and SFP+ modules, see the Pluggables compatible with Cisco CPT 50.These SFP and SFP+ modules can be connected to only selected ports of the CPT 50 panel. See

Figure 8. TDM SFP Configuration

Only the ports highlighted in green can be used to connect TDM SFP modules or any other SFP modules. The ports highlighted in purple can be used only to connect SFP+ modules.

Note	Ensure to close the remaining ports with cage caps. The Cisco part number for a cage cap is 51-2870-01.

This section describes the common terms in rings.

• Topology discovery - This refers to the functionality that discovers nodes in a CPT 50 ring using REP and report it to the topology management functions residing on TNC.

• CPT 50 in a ring - This is an instance of CPT 50 that is loaded with the CPT 50 rings software and deployed in a ring subtended from CPT 600 or CPT 200.

• Ring Controller - For a provisioned ring, this refers to the following:

  • CPT 600 or 200 network element settings from which the provisioned ring is subtended.

  • TNC card from which the nodes are managed.

• Open-ended ring - This is a type of ring that is connected to CPT 600 or CPT 200 through only one interface and does not terminate on the headend. Hence, only one unprotected path gets available to the traffic on the ring.

• Closed-ended ring - This is a type of ring that is provisioned to connect to CPT 600 or CPT 200 through two interfaces on CPT 600 or 200. Hence, a protected path gets available to the traffic either through the east or west interface on the ring.

• Working Ring Controller (WRC) - For a provisioned dual-homed ring, this refers to other CPT 600 or CPT 200 network element from which the provisioned ring is subtended.

• Protect Ring Controller (PRC) - For a provisioned dual-homed ring, this refers to the other CPT 600 or 200 network element that provide node protection to WRC.

• Ring island - This indicates a ring of the CPT 50s that has lost the connectivity to CPT 600 or CPT 200.

  In open-ended ring, ring islands are caused by a single link failure from the east port of the ring controller. This can also be caused by a failure of one of the CPT 50s in the ring.

  In closed-ended ring, ring islands are caused by two link failures between the east and the west port of the ring controller.

  In dual homed ring, ring islands are caused by two link failures between the ring ports of the ring controller. This can also be caused by a failure of one of the CPT 50s in the ring.

• Golden image - This is an image stored on the CPT 50 panel that runs a software to establish control connection between the CPT 50 and CPT 600 or CPT 200 and downloads the kernel image from it.

• Kernel image - This refers to the CPT 50 application image that is downloaded by the golden image.

• Boot Up - This is a boot-up sequence for CPT 50 that comprises the following steps:

  • Download kernel image, and allow the Boot VLAN transit traffic.

  • Boot to kernel image, and allow boot VLAN and control VLAN transit traffic based on the REP convergence.

  • Discover a unique identifier (ID) for CPT 50 and IP address from TNC.

  • Discover active TNC, and establish a connectivity with TNC.

  • Download database from TNC, and restore equipment and service configurations.

CPT supports the following types of ring:

Single-Homed Ring

A Single-homed ring is the ring that is subtending from a single CPT-600 or CPT 200 in a linear or close-ended form. Following are the types of single-homed ring:

Open-Ended Ring

An Open-ended ring is the ring that is connected to a CPT 200 or CPT 600 through one port. It follows the linear topology. To create this type of ring, only the east port is required.

Figure 9. Open-Ended Ring

Closed-Ended Ring

A Closed-ended ring is the ring that is connected to a CPT 200 or CPT 600 through two interfaces. It follows the ring topology. To create this type of ring, both the east and west ports are required. It provides protection to the circuits and the control traffic.

Figure 10. Closed-Ended Ring

Dual-Homed Ring

A Dual-homed ring is the ring whose east port exists on one CPT 200 or CPT 600 (WRC) and west port exists on another CPT 200 or CPT 600 (PRC). If WRC fails, this type of ring provides access to all the CPT 50s in the ring by switching the traffic to the other controller.

Figure 11. Dual-Homed Ring

The following MPLS-TP tunnel traffic is supported over a ring:

• Protected or unprotected MPLS–TP tunnel traffic from CPT 50 to the headend (CPT 600 or CPT 200).

• Protected or unprotected MPLS-TP tunnel traffic from CPT 50 to another CPT 50 in the same ring controller.

• Protected or unprotected MPLS-TP tunnel traffic from CPT 50 to another CPT 50 in another ring on the same headend.

• Protected or unprotected MPLS-TP tunnel traffic from CPT 50 to another CPT600 or CPT 200 that is reachable through the ring controller.

• Protected or unprotected MPLS-TP tunnel traffic from CPT 50 to another CPT 50 (in a ring) in another CPT 600 or CPT 200 that is reachable through the ring controller.

• Protected or unprotected MPLS-TP tunnel traffic from CPT 50 to another CPT 50 (in a fan-out group) in another CPT 600 or CPT 200 that is reachable through the ring controller.

The CPT 50 rings architecture is raised over the CPT 50 standalone framework. CPT 50 in a ring provides a ring-based protection to the data path and the control path.

A ring can be subtended from a single CPT 600 or CPT 200 in a linear or close-ended form and are termed as single-homed rings. It can also be subtended from two interconnected CPT 600 or CPT 200 and are termed as dual-homed rings. From a CPT 600, 20 open-ended and 10 closed-ended single-homed rings can be subtended and up to 10 dual-homed rings can be subtended. From a CPT 200, six open-ended and three closed-ended single-homed rings can be subtended and up to three dual-homed rings can be subtended.

The CPT-50 support MPLS-TP based transport over the single-homed and dual-homed rings.

E-Line is realized using VPWS across the rings. E-LAN is realized using VPLS across the rings and using local switching within a CPT-50. Carrier Ethernet is not supported across the ring. Carrier Ethernet services in this case indicate E-Line and E-LAN services realized through P2P and P2MP Ethernet switching .

CPT 50 in ring mode can be provisioned through CTC only. This section describes the scenarios in which a ring can be configured using CPT 50 and the supported software features.

MPLS-TP Tunnels in a Ring

MPLS-TP tunnels in a ring can be created manually using CTC or Cisco IOS mode. BFD-based fault detection for MPLS-TP tunnels is supported at 50ms granularity using software mechanisms. It is also possible to create unprotected MPLS-TP tunnels. Only MPLS-TP data path circuit is supported over a ring. Protected MPLS-TP tunnels cannot be created in an open-ended ring as there is no alternate path available in such a configuration.

In a dual-homed ring, it is possible to create protected MPLS-TP Tunnels to WRC or PRC across the dual-homed ring and the inter-RC link spans.

VPWS in a Closed-Ended Rings

The VPWS port-based pseudowires can be created through MPLS-TP tunnels that are created within a ring or across rings. You cannot create a pseudowire in a ring if the chassis on which the corresponding attachment circuit exists, is down

VPLS in a Closed-Ended Ring

CPT 50 in a closed-ended ring can participate in the open ring or hub-and-spoke models of VPLS.

Local Switching

CPT supports local switching in a ring. Local switching allows switching of Layer 2 data between two attachment circuits on the same CPT 50 in the ring. In local switching (also known as hairpin connection), frames from one interface are switched to another interface on the same CPT 50 in a ring.

VPWS and VPLS in a Dual-Homed Ring

In a dual-homed ring, CPT 50 can participate in VPWS and VPLS by using either unprotected or protected pseudowires, terminating either at WRC or PRC.

These limitations and restrictions apply to the ring in CPT:

• A maximum of 20 open-ended, 10 closed-ended and 20 dual-homed rings can be provisioned with CPT 600 and a maximum of 6 open-ended, 3 closed-ended and 6 dual-homed rings can be provisioned with CPT 200.

• A maximum of 15 CPT 50 panels can be configured in a ring.

• A maximum of 40 CPT 50 panels can be configured across all the rings (single-homed or dual-homed), on a single CPT 600 or CPT 200.

• The Resilient Ethernet Protocol (REP) configurations are internally provisioned on the ring.

• A ring cannot be configured on the XFP port.

• A CPT 600 or CPT 200 chassis can only have one role at a given time. It can be WRC, PRC or Single home.

• The ports that already have Fan-Out-Group (FOG) configured, cannot be used for creating a ring.

• The east port cannot be same as the west port while creating a single-homed ring.

• Services must be configured on the WRC of the dual-homed ring only, in the CTC mode and it should be in up state. It can be configured on the PRC when the WRC is down, but it is not recommended.

• In a dual-homed ring, in case of span failure service provisioning can be done only on the CPT 50's connected through the WRC, up to the first span failure .

• If a CPT 600 or CPT 200 chassis is used in dual-homed ring, it cannot be used in the single-homed ring.

• Both the WRC and the PRC should be in up state to perform any ring related provisioning on the dual-homed ring.

• Layer 1 and Layer 2 configurations should not be done on the dual-homed ring when the WRC is down, through the CTC and IOS mode.

• Services must not be configured on the ring and the Interconnect (IC) link ports when the node is in the IOS mode.

• Ring segment ID and normal REP segment ID must be different.

• Alarm synching is not supported from WRC to PRC and vice versa.

• Do not remove or change the REP parameters on the ring interface as it causes data loss and separation of CPT50 from the ring.

• Normal REP must not be configured on the Interconnect (IC) link port of a dual-homed ring.

The CPT 50 shelf can be mounted on the wall using the wall mount brackets. The type of screws used to mount the brackets on the wall depends on the wall-type; wall mount brackets are not provided by Cisco.

After the CPT 50 shelf is mounted on the wall, a fire protective tray is installed on the wall mount bracket to support the shelf assembly.

The CPT 50 shelf can be mounted on the desktop for easy access.