[c-nsp] 7500 for DSL aggregation - RSP memory error?

[jp]

We use a 7507 for about 800 DSL customers.

We've found it works more reliably and uses quite a bit less electricity 
using DC power. We'd had some random crashes on AC power from little 
power issues that weren't enough to activate UPSs. Then I got some DC 
power supplies on Ebay for less than the cost of shipping, and a big old 
loraine DC power supply from a tadiran phone switch. 

We use cold spares for parts. I've played with the redundant RSPs, but 
its not a very clean cutover, and it takes a couple minutes before 
everyting is happy. I've seen issues too where something breaks, but 
things don't switch over. 

I'm looking for even more power savings and wouldn't mind something 
non-cisco for the ATM DSL aggregation. It'll probably eventually go 
ethernet based instead of ATM, so I wouldn't be inclined to invest big 
in a short term solution. Basically, it's in a rural area with bad power 
reliability, and more power use == shorter battery runtime and more 
frequent generator refueling.

On Tue, Aug 04, 2009 at 03:59:37PM -0400, Joe Maimon wrote:
> I view the rpr feature as completely useless in the real world.
>
> Cold spare are way more effective.
>
> The last time I had a rp failure, it was fixed by yanking one and leaving 
> the other.
>
> In other words, odds are it causes more issues than it resolves.
>
> Just added complexity for a box where its already a support problem.
>
> Terminate your atm into an atm switch and run a bank of agg routers, 7200 
> or 7500.
>
> Then you can bridge group them into both, or just manual throw pvc's from 
> one router to the other.
>
> The 7500 are not worth the watts they consume.
>
>
> Walter Keen wrote:
>> Yes, I believe it was you.  We are trying to migrate from a 7200 to a 7500 
>> to gain route processor redundancy.  Our traffic is typically 20mbit peak 
>> from this site between 2 atm ds3's.  Using radius, pppoa, and some dsl 
>> subs are behind NAT, but we're slowly weeding them out into having a 
>> typical dsl connection with a public ip.  Probably about 1k subscribers, 
>> and in the next year or two we'll probably be moving them to an 
>> ethernet-based handoff from the carriers to us.
>>
>> Rodney Dunn wrote:
>>> Probably me. ;)
>>>
>>> There were some issues around DSL termination in to a VRF that would not 
>>> work.
>>>
>>> The platform was never targeted for that market space so I wouldn't use 
>>> it.
>>>
>>> 72xx, 10k, or ASR would be the pick.
>>>
>>> The ISR's on really really low end side.
>>>
>>> Rodney
>>>
>>>
>>>
>>> Buhrmaster, Gary wrote:
>>>>> I've never been brave enough to try a 7500 for dsl aggregation:)
>>>>
>>>> And while a memory parity error is probably hardware,
>>>> I have this vague recollection that someone from
>>>> Cisco (Rodney Dunn?) has on a couple of occasions
>>>> recommended against using a 7500 for broadband
>>>> aggregation, since the platform was simply not
>>>> targeted or tested to that role.  One *would*
>>>> encounter things that do not work, and they would
>>>> end up being "won't fix" on that platform.
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>>
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