IPv6 Review and RIPng

  • What 3 categories do IPv6 addresses have?
    • unicast
    • multicast
    • anycast: This design allows servers, that have the exact same function, to have the same unicast IPs. The router will forward the anycast packet to the closest server of that funcation/IP.
  • What is the purpose of Unique Local IPv6 addresses and how does it work?
    • It works just like IPv4 private addresses. Not advertised to internet.
    • Begins with FD
    • The engineer chooses the prefix not the ISP.
  • How does Link-local addresses begin?
    • FE80::/10
    • FE90::/10
    • FEA0::/10
    • FEB0::/10
      Link-local is similar to 169.254.x.x of IPv4
  • How can a device get it’s link local IP?
    • By default the device calculates the link local IP for itself.
    • There is an option to configure the link-local IP manually.
  • How do IPv6 multicast IPs begin?
    • FF::/8
  • How do they begin in link-local scope?
    • FF02::/16
  • How do you turn on IPv6 routing on a router?
    • ipv6 unicast-routing
  • Which IPv6 multicast IP represents all IPv6 devices and which all IPv6 routers?
    • FF02::1 – all devices
    • FF02::2 – only routers
  • What is the multicast address of Neighbor Solicitation message?
    • FF02::1:FF
  • How do you configure stateless auto configuration?
    • ipv6 address autoconfig
      prefix is learned from neighbor, rest is created by EUI-64
  • What is the recommended IPv6 prefix length for WAN links?
    • /127 similar to  /31 in IPv4
      ( /64 similar to /24 in IPv4 )


  • What are the differences of RIPv2 and RIPng?
    • UDP port: 520    ->   521
    • Auto summarization: yes    ->    not needed
    • Multicast Update dest:    ->    FF02::9
    • Authentication: RIP-specific    ->   Uses IPv6 AH/ESP
  • What are the specifics of RIP (updates, neighbors, metrics, convergence?)
    • periodic full updates with all routers
    • the periodic updates (30 sec) also works as a hello timer
    • metric = hop count
    • there are no neighbor relationships
    • when a router doesn’t receive a specific router or the route is poisoned (metric 16) then RIP converge
  • What kind of packet does RIP use for updates?
    • UDP
  • What is the difference between the RIPv2 and RIPng process system?
    • RIPv2 allows one RIP process
    • RIPng allows multiple RIP process (naming)
  • What are the steps of RIPng configuration?
    • ipv6 unicast-routing
       Enables IPv6 on router
    • ipv6 router rip name
      Enable IPv6 RIP 
    • under interface:
      • ipv6 address address/prefix-length [eui-64]
        ipv6 enable
      • ipv6 rip name enable 
        Need to match with the global RIP process name
  • What are the 3 main actions of RIPng?
    • first starts sending RIP updates on the RIP enabled interfaces
    • also receives and processes updates
    • advertises the connected routes on that interface
      – doesn’t advertise any link-local or local host routes (routes with /128)
  • What does RIP use as next-hop address?
    • link-local IP
  • How do you know which router has the link-local IP?
    • show cdp entry
  • Build the following topology using RIPng:
ipv6 unicast-routing
ipv6 router rip new-rip
interface FastEthernet0/1
 ipv6 address 2001:DB8:6783:123::1/64
 ipv6 rip new-rip enable
  • How would you verify RIPng?
    • sho ipv6 protocols
    • sho ipv6 rip
    • sho ipv6 rip database
    • sho ipv6 route rip

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