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Cisco Bug: CSCvs64618 - Intel D31 modem reject(na) on cBR8 v16.12 with 3 or more data profiles under ofdm-chan-profile

Last Modified

Sep 29, 2020

Products (4)

  • Cisco cBR Series Converged Broadband Routers
  • Cisco Catalyst 9800-L-C Wireless Controller
  • Cisco Catalyst 9800-L-F Wireless Controller
  • Cisco cBR-8 Converged Broadband Router

Known Affected Releases

16.12.1 n/a

Description (partial)

Symptom:
Intel based D31 modems fail to come online with cBR-8 running the 16.12.1y image. The modems fail in reject(na) state.

Conditions:
On a cBR-8 running the 16.12.1y image, configured with more than 3 data profiles under an ofdm-chan-profile, and intel-based D3.1 cable modems are used.  Example cBR-8 configuration:

!
cable downstream ofdm-chan-profile 20
  cyclic-prefix 1024
  interleaver-depth 16
  pilot-scaling 48
  roll-off 128
  subcarrier-spacing 50KHZ
  profile-control modulation-default 16-QAM
  profile-ncp modulation-default 16-QAM
  profile-data 1 modulation-default 4096-QAM 
  profile-data 2 modulation-default 2048-QAM 
  profile-data 3 modulation-default 1024-QAM 
  profile-data 4 modulation-default 256-QAM
!
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Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
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