When a customer configures a VC3 service on an OSN3500 device expansion subrack 66 slot PD3 single board, the network management reports the following error with error code 38882.

There is no problem in creating low-order services using the PD3 single boards in expansion subrack slots 64 and 65.

Host Version;V1R9C04

Process

First, check the low-order cross resources of the device, and the result shows that the device has many remaining low-order resources;

:cfg-get-lowxc-capacity:9.

LOW-XC-CAPACITY

BID MAX-CAPACITY MAX-VC4-NUM LEFT-SRC-VC4-NUM LEFT-DST-VC4-NUM LEFT-DST-VC12-NUM LEFT-DST-VC3-NUM

9 40 256 205 205 13713 630

Total records :1

Second, according to the error message, the XCE board does not have enough higher-order paths (VC4) to configure the lower-order services. Checking the product manual, the cross-capacity of the XCE is 1.25G, i.e., 8 VC4s, so the expansion subrack can only support 8 single boards of PQ1 or 4 single boards of PD3 or the mix can not be greater than 8 VC4s.

Finally, the cross-configuration and cross-matrix of the network elements are captured, and it is found that 8 VC8 resources have been used on the expansion subrack, and the detailed results are as follows:

1. view the XCE physical matrix situation. 52 (1 VC4), 53 (1 VC4), 54 (1 VC4), 55 (1 VC4), 64 (2 VC4), and 65 (2 VC4) of the extended subframe have taken up a total of 8 VC4s, which have used up all the crossover capacity of the XCE. It is not possible to create crossovers up to 66 VC4, which is the cause of this problem.

:optp:3b,0,77,1,0d,13

Optp cmd : 0d13

ff ff ff ff 2c ff ff ff 2d ff ff ff 30 ff ff ff 2f ff ff ff ff ff ff ff 31 2e

ff ff 33 32 ff ff ff ff ff ff ff 04 08 19 10 0c 18 1d 1c 04 08 19 10 0c 18 1d 1c

ff ff ff ff ff 01 ff ff ff 01 ff ff ff 01 ff ff ff 01 ff ff ff 01 ff ff ff ff 02 02

ff ff 02 02 ff ff ff ff ff ff ff ff ff 01 01 02 01 01 02 02 02 01 01 02 02 02 01 01 02 02 02

Total records :1

2c ff ff ff ff: Indicates that the first VC4 of the first bus in the upper DB header crosses over to the first VC4 of slot 52. slot 52 occupies one VC4.

2d ff ff ff: Indicates that the second VC4 of the first bus of the upper DB header crosses to the first VC4 of slot 53. slot 53 occupies one VC4.

30 ff ff ff: indicates that the first VC4 of the second bus of the upper DB header crosses to the first VC4 of slot 54. slot 54 occupies one VC4.

2f ff ff ff ff: indicates that the fourth VC4 of the first bus of the upper DB header crosses over to the first VC4 of slot 55. slot 55 occupies one VC4.

31 2e ff ff ff: Indicates that the second VC4 of the second bus of the upper DB header crosses over to the first VC4 of the 64 slot.

The third VC4 of the first bus of the upper DB header crosses to the second VC4 of slot 64. slot 64 occupies two VC4s.

33 32 ff ff: Indicates that the fourth VC4 of the second bus of the upper DB header crosses over to the first VC4 of the 65 slot.

The third VC4 of the second bus of the upper DB header crosses to the second VC4 of slot 65. slot 65 occupies two VC4s.

2. Analyzing the occupied cross capacity from the cross configuration, you can figure out that a total of eight VC4s are occupied.

Filtering the cross-matrix configuration of this network element, you can know that there are VC12 services in slots 52, 53, and 55. And the 52, 53, and 55 veneer types are ssn1pq1, then they occupy 3 VC4s.

Putting the cross-matrix configuration of this network element into filtering and screening, we can know that there exist VC3 services in slot 64 (1, 4, 5, 6VC3),65 (1, 4, 5, 6VC3). And 64 and 65 veneer type is ssn1pd3, then it occupies 4 VC4.

There exists an SNCP service that is hosted on veneer 54, and veneer 54 type is ssn1pq1, then it occupies 1 VC4.

#0x402e6:cfg-get-sncpbdmap:2.

SNCP-PU-MAP

PG-ID PU-ID SRC-BID SRC-PID SRC-AU4 SRC-PATH DST-BID DST-PID DST-AU4 DST-PATH XC-LEVEL

2 work 3 1 1 13 54 13 0 0 vc12

2 backup 3 2 1 13 54 13 0 0 vc12

Total records :2

Root Cause

The access capacity of the XCE crossover board is 1.25G, that is, it supports 8 VC4s, and the crossover mode of the expansion subrack is null-split, that is, a slot occupies 1 VC4 or 2 VC4s.

The branch boards already in use in this expansion subrack have already occupied 8 VC4 resources, and even if another PQ1 or PD3 single board is inserted, no more services can be configured.

Solution

Due to the limitations of the XCE board, you cannot configure low-order services on the 66-slot PD3 board, so you can find free time slots on other slot tributary boards to configure services.

Suggestion and Summary

When you encounter similar problems, you can refer to the method in this case to calculate the occupancy of VC4 resources.