HA 8510 with 100 Mbps on the Redundant (HA) Port?

Hi all,
I need to do some HA setup between two Cisco 8510 controllers.
I only have the opportunity to connect the two redundant ports with 100 mbps switch link. Wil it work, or MUST it be gigabit connection?
The two 8510 will replace 2 x 5508, which today is used and is connected via 100Mb switch link.
By the way, what will happen to the HA WLC if its just the link between the 2 WLC that goes down. Will it start being active, although the primary actually still is active and it's just a redundant link that has gone down?
Regards. F

No. It must be 100/1000 or maby even 10/100/1000.
This is the setup. I plan to replace the 5508 with 2 x 8510 and hope to use the same Access-link.

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HA 8510 with 100 Mbps on the Redundant (HA) Port?

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