Could this be the answer to the PPPoE anomaly?
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Could this be the answer to the PPPoE anomaly?
25-08-2009 1:21 PM
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Take a look at this article (also supported by BTW SIN docs) http://www.samknows.com/broadband/21cn_overview.php. Scroll down to the part that deals with "High level 21CN network structure". Under there you will find this statement.
21CN involves the construction of an entirely new hierarchical network. Note that the network runs over Ethernet, rather than ATM (as in the current Colossus network). We'll start from the bottom level (the 5600 exchanges) and work our way up to the core of the new BT network.
Further down is the statement..
ATM is largely being replaced by Ethernet in 21CN. That said, there will still be traces of it since PPPoA (PPP over ATM) will still be used for handling DSL connections between end user premises and the MSAN in the exchange.
Might that explain why not everyone is being affected by the PPP drop problem? It could be that the apparent incompatibility of Broadcom chipsets with something BT have done on the backhaul is actually not what is seems to be, but rather the fact that PPPoE is now mandatory?
Just thought I would throw that one into the ring just in case!
Re: Could this be the answer to the PPPoE anomaly?
25-08-2009 1:26 PM
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There is still an element to ATM. However, both encapsulation modes (as obviously you know!) work on ADSL2+.
It shouldn't have anything to do with the PPP drops being reported by some, but does explain why PPPoE works
Re: Could this be the answer to the PPPoE anomaly?
25-08-2009 1:48 PM
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Has anything useful materialised from the testing you have been doing so far?
Re: Could this be the answer to the PPPoE anomaly?
25-08-2009 1:52 PM
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I have extremely limited examples, especially now Bill's (directFS) problem doesn't appear to be PPP related.
In other news though, BT are trying to fix the problems that have been reported with the speed being considerable below IP Profile.
Re: Could this be the answer to the PPPoE anomaly?
25-08-2009 2:06 PM
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Replies #14 and 15 in http://community.plus.net/forum/index.php/topic,78341.0.html
jim:quote
Re: Could this be the answer to the PPPoE anomaly?
25-08-2009 2:11 PM
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The more widescale problems are currently being address (exchange capacity on 21C and hopefully subsequently banded profiles). for the number of examples we have on the PPP issues you've been reporting, we have to follow the normal faults process and escalate where required.
I know it's far from ideal! But I'll do whatever I can to escalate your problem.
Re: Could this be the answer to the PPPoE anomaly?
25-08-2009 2:20 PM
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jim:quote
Re: Could this be the answer to the PPPoE anomaly?
25-08-2009 2:22 PM
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With respect to the router chipset link have you managed to match the problem to a specific chipset in the exchange
DMT used to be able to identify that with the Speedtouch Routers with the Broadcom chip but the information doesn't seem to be readily available with the Netgear and I don't know about the 585v7
Re: Could this be the answer to the PPPoE anomaly?
25-08-2009 2:23 PM
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I've asked LS to get a copy of the engineers notes and to escalate it with the SFI Interventions Team (read as mroe helpful BT faults people).
I'll let you know how he gets on. Be good to have it working well on PPPoATM too!
Re: Could this be the answer to the PPPoE anomaly?
25-08-2009 2:47 PM
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Re: Could this be the answer to the PPPoE anomaly?
25-08-2009 2:49 PM
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for what's it's worth, I did look at all those who appeared to be affected by the PPP issue, but I wasn't able to see any similarities. All on different exchanges, some upgraded, some not, etc.
Re: Could this be the answer to the PPPoE anomaly?
25-08-2009 2:55 PM
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Quote from: Oldjim James,
With respect to the router chipset link have you managed to match the problem to a specific chipset in the exchange
DMT used to be able to identify that with the Speedtouch Routers with the Broadcom chip but the information doesn't seem to be readily available with the Netgear and I don't know about the 585v7
I'm running DMT with a Voyager 2110 Jim, how do you get it to identify the DSLAM chipset? ie what's the telnet command (if there is one).
Re: Could this be the answer to the PPPoE anomaly?
25-08-2009 3:10 PM
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I didn't expect PPPoE to work, given that PPPoA is used from the exchange to my router. So under what conditions does it work?
I'm using a ZyXEL router with a TI AR7 chipset.
Graham
Re: Could this be the answer to the PPPoE anomaly?
25-08-2009 3:41 PM
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Re: Could this be the answer to the PPPoE anomaly?
25-08-2009 3:55 PM
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When I first tried it, I hadn't also switched from VC to LLC encapsulation. After I saw nozzer mention LLC in another thread I tried again and it worked fine.
I don't expect it will change any of the other 'features' of my line but I'll leave it like this for a bit and see what happens.
Graham
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