Saturday, August 16, 2014

CCIE Route/Switch v5 GNS3 Lab: IPv6 Addressing, Subnetting, and IPv6 Multicast

This is a rather simple topology focused on different IPv6 addressing methods. There's a surprising amount of them:

EUI-64 Addressing: An addressing method for IPv6 where an engineer configures the subnet, and then tells the router to figure out its own host ID based on the local MAC address. Because of the large subnets supported by IPv6, this method of addressing is both possible, simple, and scaleable.

IPv6 Stateless AutoConfig/SLAAC: Hosts (or other router devices, if required) listen for RAs from an available router and copy the network/subnet address and add their own client address to the end (which they base on their MAC address if they can).

IPv6 Global Prefix: A shortcut on Cisco routers which allows a 'global' or 'organization' subnet to be set, which allows all local interfaces on that same router to be addresses with short-hand, instead of typing the entire address.

IPv6 Multicast Routing: Along with a new subnet range, PIM has been optimized for IPv6. It's also assumed to be on, and runs by default in sparse mode. There's very little config to set it up. Unfortunately there's no support yet for auto-rp, so route-points need to be set up manually, and each network device will need to be touched if there's ever a change. There is redundancy, though, by configuring multiple on each device - a manual but effective process.

Manual Addressing: That's not to say you can't just manually specify each octet (?) of your devices. A related thread: The groups are no longer 8 (oct-et) bit groups. Since IPv6 is based on hex, each grouping is worth 16 bits. So I guess they're.. hexakaidec-tet. But that's a really long name, so I'll continue calling it an 'octet,' unspecific as that is.

You can download the configuration here, with tasks labeled:

Good luck!

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