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Modem not finding valid RCC

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fendral
Modem not finding valid RCC

I have a weird one, Cisco 10k on PRE5's

I have one mac-domain that a few random 32 channel modems refuse to come online.

Debugging on the CMTS state that they cannot find a RCC:
SLOT 5/1: Oct 6 14:33:17.067: xxxx.xxxx.xxxx: RCC id 1 cannot be used by CM
SLOT 5/1: Oct 6 14:33:17.067: xxxx.xxxx.xxxx: RCC id 2 cannot be used by CM
SLOT 5/1: Oct 6 14:33:17.067: xxxx.xxxx.xxxx: RCC id 3 cannot be used by CM
SLOT 5/1: Oct 6 14:33:17.067: xxxx.xxxx.xxxx: RCC id 4 cannot be used by CM
SLOT 5/1: Oct 6 14:33:17.067: xxxx.xxxx.xxxx: RCC id 5 cannot be used by CM
SLOT 5/1: Oct 6 14:33:17.067: xxxx.xxxx.xxxx: RCC id 6 cannot be used by CM
SLOT 5/1: Oct 6 14:33:17.067: xxxx.xxxx.xxxx: RCC id 7 cannot be used by CM
SLOT 5/1: Oct 6 14:33:17.067: No RCC for Cable5/1/2 32 channel modem xxxx.xxxx.xxxx

I have multiple RCC's valid in the mac domain with other 32 channel modems no problem, although we only have 24 channels of RF spectrum available so our largest group is 24.

RCC-ID RCP RCs MD-DS-SG CMs WB/RCC-TMPL
1 00 00 00 00 00 24 0 45 WB (Wi3/0/2:0)(wb id 833)
2 00 00 00 00 00 16 0 14 WB (Wi3/0/2:1)(wb id 834)
3 00 00 00 00 00 16 0 9 WB (Wi3/0/2:2)(wb id 835)
4 00 00 00 00 00 8 0 5 WB (Wi3/0/2:3)(wb id 836)
5 00 00 00 00 00 8 0 11 WB (Wi3/0/2:4)(wb id 837)
6 00 00 00 00 00 4 0 1 WB (Wi3/0/2:5)(wb id 838)
7 00 00 00 00 00 4 0 0 WB (Wi3/0/2:6)(wb id 839)

Any ideas?

mbowe
Does the working modem have

Does the working modem have same firmware revision as non-working?
Same cm config file too?

What state does the modem get stuck in eg init(o)

How many US channels are you bonding?
What are the typical upstream power levels on this interface?
Do the troublesome modems perhaps have too high USPWR, preventing them to come online.
Doesnt explain the error about no matching RCC though

Try comparing the debug outputs for a working modem vs non-working
debug cable mac-address xxxx.xxxx.xxxx verbose
debug cable tlv
debug cable reg

mbowe
3/0/2 = SPA24 ?

3/0/2 = SPA24 ?

Have you closely compared the settings vs other SPA24 which doesnt have the issue
* controller (controller modular-cable 3/0/2)
* mac-domain (int cable 5/1/2)
* bonding group (int wide 3/0/2)
* edgeqam port (probably not this, since the issue appears to be DOCSIS related rather than RF)

fendral
It's on a HD-SPA configured

It's on a HD-SPA configured identically to all other ports on the same spa.

Has happened to multiple modem types, but all seem to be D3.1 (we have plenty of D3.1 modems on the same CM config file running on other ports)

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