NOTE: Consider the following:
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The two nodes must have different Interface IP.
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If you do not use next hop monitoring on the redundant interface, you can use any Interface IP (even if otherwise it does not exist on that network).
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If you use next hop monitoring on the redundant interface, the Interface IP address must be a real IP address that is visible from the other node.
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If you use next hop monitoring on the redundant interface, the Interface IP must be accessible from the next-hop address, and vice-versa. For details on next hop monitoring, see Next-hop router monitoring.