[c-nsp] Layer 2 redundancy

[Bruce Pinsky]

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Alban Dani wrote:
> ---SW1----|---------------------------------|CORE1|
>      |                Provider A               |
>      |                                              | hsrp
>      |                                              |
> ----SW2----|--------------------------------|CORE2|
>                      ProviderB
> 
> In the above diagram CORE1 and CORE2 are configured as hsrp peers.
> SW1 connects to CORE1 on a layer 2 connection via Provider A and SW2
> connects layer2 to CORE2 via provider B.
> 
> There is no spanning tree running accross those links.
> How can one can provide redundancy so that in case the link from Provider A
> (considered primary) fails the traffic passes through the Provider B link.
> 

I presume CORE1 and CORE2 have ethernet connections to the providers.  In
that case, your interface(s) may or may not go down.  Generally, I'd
recommend basic interface tracking, but in this case you may need to look
at enhanced object tracking.  Check out:

http://www.cisco.com/en/US/products/sw/iosswrel/ps1839/products_feature_guide09186a00801541be.html

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bep

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