[cisco-nas] Cisco 3620 PPPoE session limitation

[Oliver Boehmer (oboehmer)]

Souphonh,

the 3620 is definitly far to small for this job. 500 users with
256k/128k result in ~190 Mbit/sec or, assuming IMIX, 60k pps, much more
than the 3620 can handle. you want to look at a faster router, like the
37xx/38xx or a 7200/NPE for this type of application.

	oli

Souphonh Phounsavath <mailto:souphonh at laopdr.com> wrote on Wednesday,
November 09, 2005 6:51 AM:

> Dear All,
> 
> I am looking for small scale. The number of customers will be less
> than 1000. Customer will have bandwidth of 256Kbps for down stream
> and 128Kbps 
> for up stream. I think if 3620 PPPoE can support about 500 active
> PPPoE 
> sessions for that traffic, I can start with it. Please advice.
> 
> Regards,
> Souphonh
> 
> -----Original Message-----
> From: Oliver Boehmer (oboehmer) [mailto:oboehmer at cisco.com]
> Sent: Tuesday, November 08, 2005 6:41 PM
> To: Mounir Mohamed; Souphonh Phounsavath
> Cc: cisco-nas at puck.nether.net
> Subject: RE: [cisco-nas] Cisco 3620 PPPoE session limitation
> 
> And one important point: The 3620 will likely never be able to
> stustain 
> the load for a significant number of pppoe sessions (assuming those
> are 
> DSL customers).. You can likely terminate several hundreds idle
> sessions 
> at the same time, but once traffic is sent over the sessions, CPU can
> max out.
> 
> You always have two components to worry about:
> 
> - control plane scalability (how many sessions at which rate)
> - fowarding plance performance (how much traffic is switched through
> the 
> box)
> 
> Either one or both are limiting factors, so you could easily reach the
> max with a single session transmitting at several Mbps per second on
> the 3620..
> 
> 	oli
> 
> Mounir Mohamed <> wrote on Tuesday, November 08, 2005 12:21 PM:
> 
>> Yes, Your router Platform can use 800 interface but i want clear some
>> points, the 800 IDBs value is not for PPPOE only, NO this value for
>> (PPPOE, PPPOA, all interfaces) logical or physical, and there is
>> different IDBs (SW= Software HW=Hardware) and upon your router
>> output now you are using 7 HW and 11 SW which is totaly 18 - 800=
>> 782 IDBs it's good number for Compnay but not for ISP
>> 
>> i hop that help :)
>> 
>> Best Regards,
>> Mounir Mohamed
>> 
>> On 11/8/05, Souphonh Phounsavath <souphonh at laopdr.com> wrote:
>>> 
>>> 
>>> Dear Mounir Mohamed,
>>> 
>>> 
>>> 
>>> Thank you very much for your kindly assistance. I am really
>>> appreciate your help. The following is my output of show idb on my
>>> Cisco 3620: 
>>> 
>>> 
>>> 
>>> wbb_router#sh idb
>>> 
>>> 
>>> 
>>> Maximum number of IDBs 800
>>> 
>>> 
>>> 
>>> 11 SW IDBs allocated (2608 bytes each)
>>> 
>>> 
>>> 
>>> 7 HW IDBs allocated (4720 bytes each)
>>> 
>>> HWIDB#1   1   Ethernet0/0 (HW IFINDEX, Ether)
>>> 
>>> HWIDB#2   2   Ethernet0/1 (HW IFINDEX, Ether)
>>> 
>>> HWIDB#3   3   Ethernet0/2 (HW IFINDEX, Ether)
>>> 
>>> HWIDB#4   4   Ethernet0/3 (HW IFINDEX, Ether)
>>> 
>>> HWIDB#5   5   Virtual-Access1 (Serial, HW VACCESS)
>>> 
>>> HWIDB#6   6   Virtual-Template11 (HW IFINDEX, Serial, HW VTEMPLATE)
>>> 
>>> HWIDB#7   7   Loopback0 (HW IFINDEX)
>>> 
>>> 
>>> 
>>> So, it has maximum number of 800 IDBs, and it has been allocated 7.
>>> Does it mean that we can use up to about 700+ PPPoE connection?
>>> 
>>> 
>>> 
>>> Regards,
>>> 
>>> Souphonh
>>> 
>>> 
>>> 
>>> 
>>> -----Original Message-----
>>> From: Mounir Mohamed [mailto:mounir.mohamed at gmail.com]
>>> Sent: Tuesday, November 08, 2005 5:09 PM
>>> To: Souphonh Phounsavath
>>> Cc: cisco-nas at puck.nether.net
>>> Subject: Re: [cisco-nas] Cisco 3620 PPPoE session limitation
>>> 
>>> 
>>> 
>>> Dear Souphonh ,
>>> 
>>> 
>>> 
>>> Regarding the PPPOE sessions supported it's based on 2 factors
>>> 
>>> 1-CPE
>>> 
>>> 2-Memory
>>> 
>>> Also you can check the maximum number of Virtual-Access on 3620 by
>>> the 
>>> 
>>> following command:
>>> 
>>> Router# show idb
>>> 
>>> Maximum number of IDBs 10000 ---> Maximum number on 7204
>>> 
>>> 1135 SW IDBs allocated (2624 bytes each)
>>> 
>>> 
>>> 
>>> Regarding the IOS you can use this image
>>> 
>>> c7200-js-mz.122-27.bin
>>> 
>>> 
>>> 
>>> Best Regards,
>>> 
>>> Mounir Mohamed
>>> 
>>> 
>>> 
>>> On 11/8/05, Souphonh Phounsavath <souphonh at laopdr.com> wrote:
>>> 
>>>> 
>>> 
>>>> 
>>> 
>>>> Dear All,
>>> 
>>>> 
>>> 
>>>> 
>>> 
>>>> 
>>> 
>>>> I am looking for supported document regarding the maximum PPPoE
>>>> session if
>>> 
>>>> we will use Cisco 3620 as PPPoE access server. In other words, what
>>>> is
>>> 
>>>> maximum number of PPPoE clients can access to the router at the
>>>> same time?
>>> 
>>>> The followings are my Router version:
>>> 
>>>> 
>>> 
>>>> 
>>> 
>>>> 
>>> 
>>>> CPU:    R4700
>>> 
>>>> 
>>> 
>>>> RAM:    64MB
>>> 
>>>> 
>>> 
>>>> Flash:   16MB
>>> 
>>>> 
>>> 
>>>> IOS:      file: c3620-jk8o3s-mz.122-17
>>> 
>>>> 
>>> 
>>>> 
>>> 
>>>> 
>>> 
>>>> If you have some ideas related to this, please advice.
>>> 
>>>> 
>>> 
>>>> 
>>> 
>>>> 
>>> 
>>>> Regards,
>>> 
>>>> 
>>> 
>>>> Souphonh
>>> 
>>>> 
>>> 
>>>> 
>>> 
>>>> _______________________________________________
>>> 
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>>> 
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>>> 
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>>> 
>>>> 
>>> 
>>>> 
>>> 
>>>> 
>> 
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