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Cisco Bug: CSCul68786 - protect LC interface changed state to down after LC SO w/ pre-config CLI

Last Modified

Jan 29, 2017

Products (1)

  • Cisco uBR10000 Series Universal Broadband Routers

Known Affected Releases

12.2(33)SCH2 12.2(33.1) 15.3(3)S

Description (partial)

Symptom:
The protect line card interface state changes to "down" after line card switchover.

Conditions:
This issue occurs after line card switchover.

Steps to reproduce the issue:
Require two working line cards with modems that are online and one protect line card.
For example, line cards in 5/0 and 7/0 are working line cards and line card in 5/1 is the protect line card.

1. Configure line card group as below:
redundancy
 linecard-group 1 cable
  rf-switch name 1 rfsw1
  rf-switch name 2 rfsw2
  member subslot 5/0 working 
  member subslot 5/1 protect 
  member subslot 7/0 working 
  member subslot 5/1 protect config 5/0  ====>This issue occurs when this configuration exists.
  
interface Cable5/0/0
...
 cable upstream 0 connector 0
 cable upstream 0 frequency 10800000
 cable upstream 0 channel-width 3200000 3200000
 cable upstream 0 docsis-mode tdma
 cable upstream 0 minislot-size 2
 cable upstream 0 range-backoff 3 6
 cable upstream 0 modulation-profile 21
 cable upstream 0 rate-limit token-bucket
 cable upstream 0 equalization-coefficient
 cable upstream 0 rate-adapt
 cable upstream 0 attribute-mask 20000000
 no cable upstream 0 shutdown   ====> Ensure that the preconfig line card upstream x is "no shutdown".
...
end

2. Line card switches over from 5/0 and reverts back. All modems are still online.
3. Line card switches over from 7/0. No modems on 5/1 are available in the "show cable modem" command output. 
4. Revert back 7/0, modems go online again.
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