[j-nsp] MX960 with 3 RE's?

[Daniel Roesen]

On Wed, Jan 13, 2016 at 09:06:55AM -0800, joel jaeggli wrote:
> An mx960 has a full fabric with two SCBs.

That depends on the specific MPCs used in the chassis. Some do get
full performance only with all 3 SCBs.

> it is n+1 redundant with 3. e.g. at that point you can swap one
> without cutting the fabric bandwidth in half.

Technically, with MPCs (unlike DPCs), when removing the third SCB
you're removing 1/3rd of the fabric bandwidth as all traffic is
sprayed across all forwarding planes (two per SCB).

With DPCs, only two SCBs (thus four fabric planes) could be active,
with the third SCB being hot standby.

Best regards,
Daniel

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