[c-nsp] question about service provider network design

[Adam Armstrong]

Adam Armstrong wrote:
> Nathan wrote:
>> Hi again,
>>
>> Since Marko says my question wasn't clear I'll try to make it better :-)
>>
>> - Is running OSPF on a switch at all useful when the switch is
>> connecting routers that are running MPLS, MP-BGP, and OSPF? Can it
>> provide faster detection of link loss?
>>   
> The routers can see eachother directly at L2? Then no. It might make 
> it easier to keep the switch's management loopback connected though.
>
> Consider switching to IS-IS, assuming your kit can do it.
>> - In a campus scenario, Cisco recommends not using STP, instead
>> preferring point-to-point links. I don't have enough point-to-point
>> links, so what is better, creating an L2 square running MST, with the
>> square's top and bottom being WAN links, or creating two L2 networks,
>> each consisting of two switches (one at each of the two locations)
>> connected by one WAN link, with all routers having an interface
>> connected to both switches at its location?
> Do you have a diagram?
>
> When you say WAN, what do you mean? A long distance ethernet circuit? 
> Or a Serial/Pos/etc?
>
> adam.
>