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Well, we ran out of room there, so let's start with a fresh chalkboard and talk

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about

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VRRP versions.

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Just like with HSRP, we have two different versions.

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We have version 2 and version 3 that are both supported by Cisco.

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And the big difference is that version 3 is going to add IPv6 support and it's

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going

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to also add the ability to use millisecond timers.

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So same enhancement that we got by going from HSRP version 1 to HSRP version 2.
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So same enhancement that we got by going from HSRP version 1 to HSRP version 2.

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Now if we're going to use IP version 6, then we're going to need a new multic

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ast address

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that uses IPv6.

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And so the multicast address that's used is FF02 and then double colon 12.

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Now remember, the IPv4 address ended with .18 and usually we like to keep the

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same number,

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so why are we using 12 here?

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Well because 12 is a hexadecimal value and so if we translate hex back to
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Well because 12 is a hexadecimal value and so if we translate hex back to

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decimal, it

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actually is 18.

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So it is the same number.

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We just have to translate it to hexadecimal and plug it into an IPv6 address.

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So that's the extent of the conversation with the VRRP versions.

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For the most part, we just want to use version 3 because we have the enhance

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ments of IPv6

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and millisecond timers and yes, version 3 does still support IP version 4.

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And so we can enable VRRP version 3 and use IPv4 along with gaining the
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And so we can enable VRRP version 3 and use IPv4 along with gaining the

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enhancement of millisecond

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timers at that point.

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