Network design to 4 VC and two external switch

[Adrian Clint]

Here's a suggestion or two

I think if you connect multiple 1Gb links between two VC modules they combine bandwidth...need to check. If they do
Connect VC1 & VC5 together with 8x1GB RJ45
Connect VC2 & VC6 together with 8x1GB RJ45

So now all VC are stacked 10GB horizontally and 8GB vertically.

Now connect VC1 with 2xCX4 to CiscoA and port trunk to 20Gb.
Connect VC2 with 2xCX4 to CiscoB and port trunk to 20Gb.

Or
Connect VC1 with 2xCX4 to CiscoA and port trunk to 20Gb.
Connect VC6 with 2xCX4 to CiscoA and port trunk to 20Gb.
Put 2x CX4 links between VC2 & VC5.
Now you have a "Z" shape for your VC traffic rather than a ring.
You can still add the 1Gb links to this as it just adds extra redundancy.