[c-nsp] Packet Loss on PPPoE Sessions with 2811 LAC/LNS

[Reuben Farrelly]

The OP has stated 12.4(15) but this release does not exist as a mainline 
release, I can only assume that 12.4(15)T is intended (totally different codebase).

In terms of 12.4(11)T though, note:

http://www.cisco.com/en/US/customer/products/ps6441/products_field_notice09186a008088cc2f.shtml

is probably a good reason to be very wary especially if there is any QoS configured.

I have had good stability with 12.4(15)T1 on a number of ISR platforms, 
12.4(15)T3 seems to have a metric boatload more fixes in it from T1, so that may 
be worth a try.  12.4(15)T was a trainwreck for me too, IIRC.

Is there a reason that a mainline 12.4(18) release can't be run on the device? 
I have a few 2821s running this code and taking full BGP tables, and they seem 
stable so far - that'd likely be preferable to running T releases unless there 
are features in the 12.4T train that you need.

Curious, roughly how many sessions are being terminated on the router?

Reuben


On 3/02/2008 11:56 PM, Ziv Leyes wrote:
> I'll second Łukasz, downgrade to 12.4(11)T4, it's the best IOS I've tried on
> the last year, I don't think you really need that newer version, it doesn't
> give you much more than you already have and if it does, you probably don't
> need it.
> 
> Ziv
> 
> -----Original Message----- From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of ?ukasz Bromirski 
> Sent: Sunday, February 03, 2008 2:51 PM To: Kurt Bales Cc:
> cisco-nsp at puck.nether.net Subject: Re: [c-nsp] Packet Loss on PPPoE Sessions
> with 2811 LAC/LNS
> 
> Kurt Bales wrote:
>> Hey all,
>> 
>> I have a 2811 successfully terminating PPPoE sessions for a local ethernet 
>> segment. What I am seeing now is that once I establish a session, pings to 
>> devices beyond the 2811 are losing every second attempt. Pings from the 
>> client to the 2811 are fine. When not terminated in PPPoE, pings to all 
>> hosts work normally.
>> 
>> Does anyone have any obvious ideas as to why this would be happening? I 
>> don't have access to the 2811 right now to paste relevent configs, but I
>> can paste them as required tomorrow. The 2811 is running 12.4.15 Advanced
>> IP Services iirc.
> 
> First of all, try to check if You have CEF turned on on this router and if
> there's not too much process-switched traffic (sh cef not-cef-switched). And
> second of all - 12.4(15) is really nasty, upgrade to 12.4(15)T3 or downgrade
> to 12.4(11)T4.
> 
> -- "Don't expect me to cry for all the     |               Łukasz Bromirski 
> reasons you had to die" -- Kurt Cobain |    http://lukasz.bromirski.net 
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