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Re: [OSPF] OSPF scalability



Dear,

 

Thank you for your answer.

 

>         This email is intended to be vender neutral discussions

>         wrt OSPF. IMO, if the more dynamic links are separated

>         and associated with one or more separate areas, then

>         convergence time should improve and the amount of CPU

>         resources should decrease.

 

 

I agree with you that the separation of the dynamic links should improve the performance.

 

 

>         I do not have a rule of thumb on the number of routers

>         in an area, but without BMA type links, this number seems

>         excessive for a single area.

 

 

What do you mean by « without BMA type links » ?

 

Thanks in advance

Vincent NOGUES

 

 

> Vincent Nogues wrote:

>

> Dears,

>

>

>

> I have a network made up 180 Cisco routers (3825 series). They are

> meshed with about 300 links. These links are quite heterogeneous in

> terms of bandwidth (between 2Mb/s and 8Mb/s). The network is quite

> dynamic, i.e. some links are regularly added or removed. There are

> also about 500 external routes injected in this network. The routers

> implement the following services: access-list and route-map, QoS and

> shaping, dot1Q encapsulation, 4 OSPF processes, BGP, SNMP.

>

>

>

> My questions are:

>

> ü       Is it recommended to integrate these 180 routers in a single

> OSPF area (area 0.0.0.0)?

>

> ü       Have someone already experienced such an issue and do you know

> if the 3825 routers are able to compute (in terms of CPU or memory)

> all these OSPF routes in a reasonable time (i.e. Convergence time less

> than 1 minute)?

>

>

>

> I would like to know if my network will be reliable with such an

> important number of routers in a single area.

>

>

>

> Thanks in advance,

>

>

>

> ---------------------------------------------------

>

> Vincent NOGUES

>

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