Cambridge CMTS 17-2 / CMTS 15-2
First of all this is a semi-cross post from a certain help and support forum from a certain popularly known ISP in these parts. I'm curious as for your options on the current state of play:
In November last year things nose dived on our connection in Trumpington, Cambridge and pings and packet loss were a mess most of the time. During peak times iplayer or even loading a website was impossible at times. It seems Virgin did some rebalancing or something a month or so ago and I ended up moving from CMTS 15-2 to CMTS 17-2 but things have been horrible. I keep being promised new dates and get different info from different teams.. Will this ever stop? The plan was to wait for CMTS 15-2 to get upstream 3 then get moved back but I can't get up to date info on this anymore either. Here is my TBB graph for the superhub: https://www.cableforum.co.uk/images/...2012/04/47.jpg Now my parents who are also on 30mbit and are 2 miles away and ironically when I got moved off CMTS 15-2 to 17-2 they got moved from 14-2 to 15-2 and look at their TBB monitor: https://www.cableforum.co.uk/images/...2012/04/48.jpg And also my brother who is also on CMTS 15-2 and hs been throughout: https://www.cableforum.co.uk/images/...2012/04/49.jpg This baffles me... Modem stats added: Startup Procedure Procedure Status Comment Acquire Downstream Channel 299000000 Hz Locked Connectivity State OK Operational Boot State OK Operational Configuration File OK Security Enabled BPI+ Downstream Channels Lock Status Modulation Channel ID Max Raw Bit Rate Frequency Power SNR Docsis/EuroDocsis locked Locked QAM256 101 55616000 Kbits/sec 299000000 Hz -0.1 dBmV 41.6 dB Hybrid Locked QAM256 99 55616000 Kbits/sec 283000000 Hz 0.1 dBmV 41.4 dB Hybrid Locked QAM256 100 55616000 Kbits/sec 291000000 Hz -0.2 dBmV 41.5 dB Hybrid Locked QAM256 102 55616000 Kbits/sec 307000000 Hz -0.6 dBmV 41.3 dB Hybrid Locked QAM256 103 55616000 Kbits/sec 315000000 Hz 0.5 dBmV 41.3 dB Hybrid Locked QAM256 104 55616000 Kbits/sec 323000000 Hz 0.1 dBmV 41.5 dB Hybrid Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 0.0 dB Unknown Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV 0.0 dB Unknown Upstream Channels Lock Status Modulation Channel ID Max Raw Bit Rate Frequency Power Locked ATDMA 4 20480 Kbits/sec 45800000 Hz 31.0 dBmV Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV Unlocked Unknown 0 0 Ksym/sec 0 Hz 0.0 dBmV Primary Downstream Service Flow Downstream(0) SFID 876 Max Traffic Rate 33330000 bps Max Traffic Burst 3044 bytes Mix Traffic Rate 0 bps Primary Upstream Service Flow Upstream(0) SFID 875 Max Traffic Rate 3333000 bps Max Traffic Burst 8160 bytes Mix Traffic Rate 0 bps Max Concatenated Burst 8160 bytes Scheduling Type Best Effort |
Re: Cambridge CMTS 17-2 / CMTS 15-2
Surely you'll still be on the same UBR?
I can clone my MAC and get a different IP address, i was im CMTS 16 in Teesside, then cloned a different MAC and i was on CMTS 2, maybe you can change the way you're routed but you can't change your UBR. |
Re: Cambridge CMTS 17-2 / CMTS 15-2
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Re: Cambridge CMTS 17-2 / CMTS 15-2
You literally can't be moved from one UBR to another from the flick of a switch, you're still on UBR 2, just on another range of IPs the way i understand it, possibly just routed differently, hmm
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Re: Cambridge CMTS 17-2 / CMTS 15-2
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I checked my Virgin Email addy and they finally made some sense: Hi REMOVED, With regards to the information I can provide you with this is not much due to the business sensitivity however I can confirm CMTS 15 is receiving a new upstream, this will be the 3rd upstream however until this work is completed (due to end Mid April) the number of devices across the 3 CMTS in your area have been balanced to minimise the effect of utilisation. Once the 3rd upstream has been completed you will be moved back to CMTS 15 where the service will be working correctly and the number of devices connected will be equally balanced. I hope this information helps, Kindest Regards, REMOVED NAMED REMOVED|Chief Executives Office Virgin Media, PO Box 238, Wythenshawe, Manchester, M22 0WJ CONTACT REMOVED| REMOVED@virginmedia.co.uk 24 Mar to REMOVED Understood. So just to confirm the moving of some connections to CMTS 17-2 is until CMTS 15-2 has recieved new upsteam in the coming weeks and then I will be moved back to CMTS 15-2? 26 Mar to me Hi REMOVED, I can confirm this is correct. Best, REMOVED |
Re: Cambridge CMTS 17-2 / CMTS 15-2
none of the graphs are particurly good but I wonder if cmts 17 is also getting a new US as that sure needs it more than 15.
Interesting as well that the CEO office gave you that kind of info, usually I just get told something along the lines work is planned and thats it. |
Re: Cambridge CMTS 17-2 / CMTS 15-2
When you complain to the ISPA 3 times and then mention the next step CISA they I guess start to start to have to think. And as for more US on 17 I suspect moving a load of people onto it who arent usually on 17 is causing a problem for others :(
Merry go round |
Re: Cambridge CMTS 17-2 / CMTS 15-2
I noticed low upstream power (31.5).
If your event log contains a lot of T3 events, then there's an investigation required. You TBB graph (with its packet loss) is consistent with upstream issues. As regards the UBR, it's the line card where congestion occurs not the UBR as a whole (generally). |
Re: Cambridge CMTS 17-2 / CMTS 15-2
Apologies for the half-hijack ;) ... Suffering with upstream issues here too (wolv14 CMTS I believe).
Attempting to identify for certain the CMTS to do some monitoring; I don't have an overabundance of knowledge about how VM's network is currently laid out, where the CMTSes sit in their topology etc so I'm (re)learning as I go. Is the simplest way to first resolve your gateway IP and go from there? Taking the current connection I'm using (cpc31-wolv14-2-0-custnn.16-1.cable.virginmedia.com), the connection gateway is cpc31-wolv14-2-0-gw.16-1.cable.virginmedia.com... which would make it CMTS wolv14? Aside from either recursively searching the virginmedia.com DNS entries, do they all follow a standard format, e.g. wolv-cmts-12-ge01.network.virginmedia.net wolv-cmts-13-ge01.network.virginmedia.net wolv-cmts-14-ge01.network.virginmedia.net I've noticed parts of the hostnames can differ (e.g. ge02) so I'm assuming this simply denotes the inbound route (as the resolved IP is identical). Is there any way to monitor specific CPCs on the CMTS? |
Re: Cambridge CMTS 17-2 / CMTS 15-2
You are on CMTS-14 at Wolverhampton. The "ge01" info refers to the type of port and port number (as in gigabit ethernet).
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Re: Cambridge CMTS 17-2 / CMTS 15-2
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Do you know if the CMTSes deprioritise ICMP? |
Re: Cambridge CMTS 17-2 / CMTS 15-2
Yes it does when it has to.b
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