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CHAPTER 14 IGPs: RIP, OSPF, and ISIS 363 1 byte R o u t e E n t r y R o u t e E n t r Command 1 byte Version 1 byte 1 byte Unused (set to all zeros) IPv6 Address Route Tag Prefix Length Metric (Repeats multiple times, up to a maximum of 25) IPv6 Address Route Tag Prefix Length Metric