Configure Optical Cross Connects (OXC) Endpoints in COSM

Introduction

This document describes the procedure to edit Optical Cross Connects (OXC) in Cisco Optical Site Manager (COSM) on the NCS1010.

Prerequisites

Requirements

There are no specific requirements for this document.

Components Used

This behavior described in this document occurs when using a specific combination of hardware and software.

Software

• Cisco IOS® XR 26.1.1 with COSM due to Cisco bug ID CSCwt20864

Hardware

• NCS1010-E-OLT-C or other NCS1010 Optical Line Terminal (OLT)
• NCS1K-BRK-24 or other colorless add/drop module

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, ensure that you understand the potential impact of any command.

Background Information

COSM displays cross connects under Optical Setup > Optical Cross Connects after creation of a channel in the XR CLI or import of an XML from Cisco Optical Network Planner (CONP). The OXC shows the logical path of the service from the add-drop port to the LINE-RX and LINE-TX.

Optical Cross Connects in COSM

Symptoms

When using a BRK-24 unit, a cross connect can incorrectly show the service state OOS-AU,AINS, meaning Out of Service and Autonomous, Automatic In-Service. Traffic continues to flow normally. The channel otherwise shows operational and no alarms raise against it.

RP/0/RP0/CPU0:OLT-C-node# show hw-module location 0/0/NXR0 terminal-ampli
Mon Apr 27 20:35:41.272 UTC

Legend:
NXC      - Channel not cross-connected
ACTIVE - Channel cross-connected to data port
ASE        - Channel filled with ASE
FAILED - Data channel failed, pending transition to ASE
PENDING_ACTIVATION - Data Channel pending transition to ACTIVE/FAIL

Location:             0/0/NXR0

Status:               Provisioned

Flex Grid Info

Channel Number      Centre Frequency(THz)       Channel Width(GHz)    Channel Status    Overlapping Channels
1                   191.375000                  75.000                ACTIVE              - ,   -
2                   191.675000                  75.000                ACTIVE              - ,   -
3                   191.975000                  75.000                ACTIVE              - ,   -
4                   192.275000                  75.000                ACTIVE              - ,   -

Workaround

Lock the Node

In order to prevent the configuration from reverting, lock the node before performing the workaround steps in COSM > Devices:

• Select the device with the incorrect endpoints.
• Click Edit.
• Set the Admin State to locked.
• Click Apply.

Determine the Current Endpoints

Under Optical Setup > Optical Cross Connects, note the current values of Path 1 End-point and Path 2 End-points.

Determine the Correct Endpoints

The table shows the mapping between the BRK-24 and channel endpoints. This example uses the port A/D 26-33 on the NCS1010-E-OLT-C for the BRK-24 MPO connection.

Ots Controller (R/S/I/P)	CH-n-RX or -TX	BRK-24 Physical Port
0/0/0/26	CH-0	1
0/0/0/26	CH-1	2
0/0/0/26	CH-2	3
0/0/0/27	CH-3	4
0/0/0/27	CH-4	5
0/0/0/27	CH-5	6
0/0/0/28	CH-6	7
0/0/0/28	CH-7	8
0/0/0/28	CH-8	9
0/0/0/29	CH-9	10
0/0/0/29	CH-10	11
0/0/0/29	CH-11	12
0/0/0/30	CH-12	13
0/0/0/30	CH-13	14
0/0/0/30	CH-14	15
0/0/0/31	CH-15	16
0/0/0/31	CH-16	17
0/0/0/31	CH-17	18
0/0/0/32	CH-18	19
0/0/0/32	CH-19	20
0/0/0/32	CH-20	21
0/0/0/33	CH-21	22
0/0/0/33	CH-22	23
0/0/0/33	CH-23	24

Edit the Endpoints

In the XR command line, enter COSM mode to edit the endpoints.

RP/0/RP0/CPU0:OLT-C-node# cosm
NODE0/<ip_address>:cosm# config
Entering configuration mode terminal
NODE0/<ip_address>:cosm(config)# insert nodes node 0 oxc OLT-C_node_B_1_0_0_191_375 [Enter]
Value for 'oxc-type' [bidirectional,monodirectional]: bidirectional
Value for 'central-frequency' [<decimal number>]: 191.975
Value for 'allocation-width' [<decimal number>]: 75.0
Value for 'path1 endpoints src-if' [<string>]: 4/0/LINE-RX
Value for 'path1 endpoints dst-if' [<string>]: 6/0/CH-0-TX
Value for 'path2 endpoints src-if' [<string>]: 6/0/CH-0-RX
Value for 'path2 endpoints dst-if' [<string>]: 4/0/LINE-TX 
NODE0/<ip_address>:cosm(config)# commit

Validate Configuration 

Ensure the configuration change took effect with show running-config nodes node 0 oxc <connection_label>.

NODE0/<ip_address>:cosm# show running-config nodes node 0 oxc OLT-C_node_B_1_0_0_191_375
nodes node 0
 oxc OLT-C_node_B_1_0_0_191_375
  circuit-id        ""
  oxc-type          bidirectional
  admin-state       In-Service
  central-frequency 191.375
  allocation-width  75.0
  signal-width      0.0
  ase-loading       enabled
  path1 endpoints src-if 4/0/LINE-RX
  path1 endpoints dst-if 6/0/CH-0-TX
  path2 endpoints src-if 6/0/CH-0-RX
  path2 endpoints dst-if 4/0/LINE-TX
 !
!

Unlock the Node

• Select the same device with the now corrected endpoints.
• Click Edit.
• Set the Admin State to unlocked.
• Click Apply.

Verify the Service State

After committing the configuration in the COSM CLI, verify the service state changes to In-Service (IS).

NODE0/<ip_address>:cosm# show nodes node 0 oxc OLT-C_node_B_1_0_0_191_375
oxc OLT-C_node_B_1_0_0_191_375
 oper-primary-state   IS
 oper-secondary-state NR
 programming-status   planned
 partial              false
 path1 oper-primary-state IS
 path1 oper-secondary-state NR
 ...
 path2 oper-primary-state IS
 path2 oper-secondary-state NR

Revision History

Revision	Publish Date	Comments
2.0	30-Apr-2026	Software and Hardware Information Added and Updated Formatting.
1.0	29-Apr-2026	Initial Release