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IPv6 Routing

IPv6 Routing. Agenda. IPv6 Routing Concepts in CCNA R&S IPv6 Host Routing Table IPv6 Routing Table Connected Routes Local Routes Static Routing Default Route “The rest of this is exactly like IPv4 only different”

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IPv6 Routing

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  1. IPv6 Routing

  2. Agenda • IPv6 Routing Concepts in CCNA R&S • IPv6 Host Routing Table • IPv6 Routing Table • Connected Routes • Local Routes • Static Routing • Default Route • “The rest of this is exactly like IPv4 only different” • - Rick Graziani at Academy Conference 2013 right after he finishes talking about IPv6 address types

  3. Routing & Switching Essentials – IPv6 Content Chapter 6: Static Routing • 6.2.3 Configure IPv6 Static Routes • 6.2.4 Configure IPv6 Default Routes • 6.4.2 Configure IPv6 Summary Routes Chapter 7: Routing Dynamically • 7.3.2 Configuring the RIPng Protocol • 7.5.4 Analyze an IPv6 Routing Table Chapter 8: Single-Area OSPF • 8.3 Configuring Single-area OSPFv3 Note: EIGRP for IPv6 covered in Scaling Networks Draft

  4. Routing & Switching Essentials – Labs and Activities • 6.2.4.4 Packet Tracer – Configuring IPv6 Static and Default Routes • 6.2.4.5 Lab – Configuring IPv6 Static and Default Routes • 6.4.2.4 Packet Tracer – Configuring IPv6 Route Summarization • 6.4.2.5 Lab – Calculating Summary Routes with IPv4 and IPv6 • 6.5.2.5 Lab – Troubleshooting IPv4and IPv6 Static Routes • 7.3.2.3 Packet Tracer - Configuring RIPng • 7.3.2.4 Lab – Configuring RIPv2 and RIPng • 7.5.4.4 Activity – Identify Parts of an IPv6 Routing Table Entry • 8.3.3.5 Packet Tracer – Configuring Basic OSPFv3 in a Single Area • 8.3.3.6 Lab – Configuring Basic Single-Area OSPFv3 Draft

  5. Host Routing Table • Introduction to Networks 6.2.1.6

  6. Making a Router an IPv6 Router Router(config)# ipv6 unicast-routing • A router’s interfaces can be enabled (configured with an IPv6 address) for IPv6 like any other device on the network • For the router to “act” as an IPv6 router it must be enabled with the ipv6-unicast routingcommand • This enables the router to: • Send ICMPv6 Router Advertisement messages • Enable the forwarding of IPv6 packets • Configure static routing and participate in IPv6 routing protocols (EIGRP for IPv6, OSPFv3) • Similar to “old” ip routingcommand for IPv4 which isenabled by default

  7. IPv4 Routing Table R1# show ip route C 172.17.0.0/16 is directly connected, Loopback3 172.16.0.0/24 is subnetted, 1 subnets C 172.16.1.0 is directly connected, FastEthernet0/1 10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks C 10.2.0.0/16 is directly connected, Loopback1 C 10.1.1.0/24 is directly connected, FastEthernet0/0 C 192.168.3.0/24 is directly connected, Loopback0 • IPv4 Routing table lists the classful network first and subnets below the respective classful network

  8. IPv6 Routing Table R1# show ipv6 route IPv6 Routing Table - 8 entries Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP U - Per-user Static route, M - MIPv6 I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2 ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2 D - EIGRP, EX - EIGRP external C 2001:DB8:CAFE:1::/64 [0/0] via ::, FastEthernet0/0 L 2001:DB8:CAFE:1::1/128 [0/0] via ::, FastEthernet0/0 C 2001:DB8:CAFE:1111::1/128 [0/0] via ::, Loopback0 C 2001:DB8:CAFE:A001::/64 [0/0] via ::, Serial0/0/0 L 2001:DB8:CAFE:A001::1/128 [0/0] via ::, Serial0/0/0 C 2001:DB8:CAFE:A002::/64 [0/0] via ::, Serial0/0/1 L 2001:DB8:CAFE:A002::1/128 [0/0] via ::, Serial0/0/1 L FF00::/8 [0/0] via ::, Null0

  9. Examining the Routing Table

  10. Show IPv6 Route Command Syntax • show ipv6 route [ipv6-address | ipv6-prefix/prefix-length [longer-prefixes] | [protocol][updated [boot-up][day month][time]] | interfaceinterface-type interface-number | nsf | tabletable-id |watch] Useful Options*: • show ipv6 route connected • show ipv6 route local • Show ipv6 route static *These options not supported by Cisco Packet Tracer

  11. Connected Routes • R1 has four interfaces on which a global IPv6 unicast address has been configured • Interfaces that are [up/up] are added to the routing table identified with a C in the IPv6 routing table R1# show ipv6 interface brief FastEthernet0/0 [up/up] FE80::1 2001:DB8:CAFE:1::1 FastEthernet0/1 [administratively down/down] Serial0/0/0 [up/up] FE80::1 2001:DB8:CAFE:A001::1 Serial0/0/1 [up/up] FE80::1 2001:DB8:CAFE:A002::1 Loopback0 [up/up] FE80::202:16FF:FE73:1889 2001:DB8:CAFE:1111::1 R1# show ipv6 route C 2001:DB8:CAFE:1::/64 [0/0] via ::, FastEthernet0/0 C 2001:DB8:CAFE:1111::1/128 [0/0] via ::, Loopback0 C 2001:DB8:CAFE:A001::/64 [0/0] via ::, Serial0/0/0 C 2001:DB8:CAFE:A002::/64 [0/0] via ::, Serial0/0/1 *Only connected shown

  12. Local Routes R1# show ipv6 route IPv6 Routing Table - 8 entries Codes: C - Connected, L - Local, S - Static, R - RIP, B - BGP U - Per-user Static route, M - MIPv6 I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2 ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2 D - EIGRP, EX - EIGRP external C 2001:DB8:CAFE:1::/64 [0/0] via ::, FastEthernet0/0 L 2001:DB8:CAFE:1::1/128 [0/0] via ::, FastEthernet0/0 C 2001:DB8:CAFE:1111::1/128 [0/0] via ::, Loopback0 C 2001:DB8:CAFE:A001::/64 [0/0] via ::, Serial0/0/0 L 2001:DB8:CAFE:A001::1/128 [0/0] via ::, Serial0/0/0 C 2001:DB8:CAFE:A002::/64 [0/0] via ::, Serial0/0/1 L 2001:DB8:CAFE:A002::1/128 [0/0] via ::, Serial0/0/1 L FF00::/8 [0/0] via ::, Null0 L Routes

  13. Local Routes • Not routable • Local route = similar to what we called a host route in IPv4 • Host routes point to the router’s IPv6 global unicast addresses • The router uses these routes when the packets are addressed to one of its own interfaces • Router can more efficiently process packet to itself • Host routes in IPv6 will have /128 prefix L 2001:DB8:CAFE:1::1/128 [0/0] via ::, FastEthernet0/0 L 2001:DB8:CAFE:A001::1/128 [0/0] via ::, Serial0/0/0 L 2001:DB8:CAFE:A002::1/128 [0/0] via ::, Serial0/0/1 L FF00::/8 [0/0] via ::, Null0 L FF80::/10 [0/0] via ::, Null0

  14. Local Routes Multicast • Multicast addresses are not routed • FF00/8 is the route to the entire multicast range • The router will drop all multicast packets directed towards multicast groups which are not in the routing table • If a host joins a multicast group then that multicast group address will be added to the routing table Link-Local • FE80/10 is the link-local address • If a router receives a packet destined to link-local address it will drop it • L FE80::/10 [0/0] does not appear in the output of show ipv6 route in Packet Tracer Multicast Link-local L FF00::/8 [0/0] via ::, Null0 L FF80::/10 [0/0] via ::, Null0

  15. Static Route IPv6 Command Syntax

  16. Default Static IPv6 Command Syntax

  17. Static Routing Static Routing is configured using ipv6 route command Next Hop Interface (recommended due to CEF forwarding) • ipv6 route 2001:db8:cafe:3333/64 2001:db8:cafe:A003 Outgoing Interface • ipv6 route 2001:db8:cafe:3333/64 s0/0/1 Link-local as Next Hop* • ipv6 route 2001:db8:cafe:3333/64 fe80::3 s0/0/1 • Need to specify which interface with a fully specified static route as the link-local address can be the same on multiple interfaces Summary route • ipv6 route 2001:db8:cafe::/48 2001:db8:feed::1

  18. IPv6 Dynamic Routing Protocols Exterior Gateway Protocols Interior Gateway Protocols Path Vector Distance Vector Link State IPv4 IPv6 Most IPv6 routing protocol commands are identical to their IPv4 counterpart Just need to substitute “ipv6” for “ip”

  19. Static Routing PT Activity • Enable ipv6 unicast-routing • Configure static routes • Configure default routes • Configure floating static route

  20. PT Activity Configuring Static and Default IPv6 Routes

  21. Questions and Answers

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