Cisco Bug: CSCtc23794 - WCM ping loss: DSID seq-num not cleared in SPA for DSIDs in higher range
Feb 05, 2017
- Cisco uBR10000 Series Universal Broadband Routers
Known Affected Releases
Symptom: - Some wideband cable modems are w-online but cannot be pinged. - DOCSIS pings to CMs can be done successfully. - This results in loss of IP connectivity for the modems. Note that the symptoms mentioned above are quite generic. This ddts is used to track the issue that is observed in 12.2(33)SCB4 that is a side-effect of the CSCta71839 fix. Conditions: When the CMTS has been running for a few days, a CM that comes online is assigned a previously used DSID that has some residual seq-num in the SRAM. This results in using a non-zero value as a packet sequence number in the DS EHDR of the first packet. Some CMs do not accept non-zero seq num in first packet.
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Bug Details Include
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