Re: Maximum Number of ospf areas configurable on a router

From: Paul Cosgrove (paul.cosgrove@heanet.ie)
Date: Wed Aug 20 2008 - 13:25:14 ART

In the case of the max number of interfaces, there is some guidance
about max IDB values on the cisco site:
http://www.cisco.com/en/US/products/sw/iosswrel/ps1835/products_tech_note09186a0080094322.shtml
But this does not get into memory or cpu, and these factors would be
affected by what other processes are running at the time.

Regarding OSPF, I would think that predicting memory requirements would
be more difficult, since memory useage for OSPF could vary greatly
according to the number of routes and areas/area types.

Paul.

GAURAV MADAN wrote:
> Well .. this is nowhere related to technology .. more to do with how
> Software is written ,,
>
> Although you see many loopbacks that you can configure (2147483647)
> but actually you cannot .
>
> The reason is that S/w has some resources that it allocates to each interface .
> So that depend on router you are using . what memory it has etc etc .
>
> Even creating a sub-interface of a serial interface consumes a resource .
>
> Thats the reason we have so many flavours of routers in market .
>
> There are clis to see resources available and max resources .. but
> guess not many ppl will b able to make sense of it and also no use of
> same clis in field .
>
> HTH
> Gaurav Madan.
>
> On Wed, Aug 20, 2008 at 8:27 PM, Fahad Khan <fahad.khan@gmail.com> wrote:
>> Yeah.There are more points.If i am not wrong,It also depends upon how many
>> Interfaces we have on a router. After all , we have to declare an inteface
>> as a member of certain area. So far loopbacks are concerned,
>>
>> R1(config)#interface loopback ?
>> <0-2147483647> Loopback interface number
>>
>> regards,
>>
>>
>> On 8/20/08, Marca Porte <marc.a.laporte@gmail.com> wrote:
>>> Uhm... I make the silly assumption that one cannot configure 4294967295
>>> areas on a single router.
>>> This number is 2^32 and so gives room for using dotted decimal as area
>>> numbers (for convenience)
>>>
>>>
>>> On Wed, Aug 20, 2008 at 4:34 PM, Fahad Khan <fahad.khan@gmail.com> wrote:
>>>
>>>> Dear John,
>>>>
>>>> R1(config-router)#area ?
>>>> <0-4294967295> OSPF area ID as a decimal value
>>>> A.B.C.D OSPF area ID in IP address format
>>>>
>>>> HTH
>>>>
>>>>
>>>>
>>>> On 8/20/08, john edward <john4edward@gmail.com> wrote:
>>>>> Hi Guys,
>>>>>
>>>>> Please does anyone know if there is a limit or restriction on the number
>>>> of
>>>>> areas that can be configured on a single backbone router. or number of
>>>>> areas
>>>>> in one network
>>>>>
>>>>> Regards,
>>>>>
>>>>> Edward
>>>>>
>>>>>
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>>>> *FAHAD KHAN
>>>>
>>>> BE Computer Systems NED,
>>>>
>>>> CCNA,CCDA,CCNP,FOUNDFE,CLSE,QOS,JNCIA,JNCIS,MCP,CCIE (Written)
>>>>
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>> --
>> *FAHAD KHAN
>>
>> BE Computer Systems NED,
>>
>> CCNA,CCDA,CCNP,FOUNDFE,CLSE,QOS,JNCIA,JNCIS,MCP,CCIE (Written)
>>
>> Systems Support Engineer, Premier Systems (Pvt) limited,
>>
>> Karachi, Pakistan
>>
>> 92-321-2370510.*
>>
>>
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>>
>> _______________________________________________________________________
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