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7 posts • Page 1 of 1
i got a init(rc) problem in cable modem .
my CMTS is Ubr10K+ pre4 + 20x20
ios is 12.2(33)SCC7
1. cm w-online ping cm ip is timeout but ping docsis is ok . in this state , cpe can't connection to internet , also can't get ip address from dhcp server.
2. after cm reboot , will stop init(rc) --> offline --> init(rc)
3. after clear cm delete , cm become w-online agalin.
it random happen in online cable modem .
is anyone have see this problem before ?
I have same CMTS hardware as you
I have seen that same problem at one stage in the past
Worst affected were Arris D3 modems
Our CMTS was running 12.2(33)SCE3 at the time. You say you have SCC7. I wonder if SCC7 shares some affected code with SCE3? I see SCC7 was published April 2011, SCE3 was published May 2011. So I reckon there is a good chance the same bug affects both.
Anyway, we ended up sending some CM debugs through to Arris and they told us :
So basically it sounded like some sort of Cisco bug
From memory we implemented this suggested workaround until we could upgrade to SCF2. At that point the problem was gone, and we havent seen it since.
So my recommendation is for you to move to a newer IOS. We currently have SCF4 and are planning on jumping to SCG2 soon as Cisco have supposedly patched our last batch of remaining bugs in this build. Fingers crossed they dont add any new ones.
thanks your reply
right now , we still got the problem .
also had CISCO TAC online check the problem , but they can't find the problem.
this problem only happen on DOCSIS 3.0 cable modem (we have cisco DPC3008 , Moto SB6141)
and this issue have random in every slot , not only one kind cable modem , or one slot.
CISCO TAC still don't have any answer , so bad ......
not yet , because TAC don't have any idea about the problem
already 3 TAC ppl to check the cmts . still can't confirm the problem. also can't sure problem will solve after upgrade IOS.
only tell us the SCC7 are very old IOS.
TAC want us use cable modem console to debug .
but still search the special cable modem .
that really bad solution and bad feel .
If they don't know what is wrong, then I would upgrade.
If this works it will be a much faster resolution than waiting for TAC.
If you really dont like the new IOS then you can always roll back.
Just book the upgrade in for middle of the night. One or two controlled reboots is much better result for you and your customers than having modems randomly getting stuck offline.
Your symptoms are pretty much the same as we saw. I think an upgrade has a good chance of fixing it.
We took our first CMTS to SCG2 last week, and it is working well. Looks to have resolved all our outstanding bugs we had open with Cisco. Going to upgrade our other units to SCG2 over the coming weeks.
Be Careful on blind upgrades to fix unknown bugs as it is possible some of the features you might use today might not be supported in later versions of IOS or you could just find new bugs. I would work with TAC the best you can. IOS's after SCF change the MIB structure and your monitoring tools might have issues once you upgrade past SCE. Anyway please keep us posted on what you end up finding as I am sure a lot of folks find our site thru google when trying to fix there CMTS.
7 posts • Page 1 of 1
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