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IPv6 Routing

IPv6 Routing. Agenda. IPv6 Routing Table Connected Routes Local Routes Static Routing Default Route. Very Very Important . IPv6 routing is turned off by default on Cisco IOS So please issue the command ipv6 unicast-routing in global configuration mode to enable IPv6 Routing

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IPv6 Routing

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  1. IPv6 Routing

  2. Agenda IPv6 Routing Table Connected Routes Local Routes Static Routing Default Route

  3. Very Very Important IPv6 routing is turned off by default on Cisco IOS So please issue the command ipv6 unicast-routing in global configuration mode to enable IPv6 Routing For Eg: R1(config)#ipv6 unicast-routing

  4. Topology

  5. IPv4 Routing Table R1#sh 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

  6. IPv6 Routing Table There are no classes in IPv6  IPv6 Routing Table lists the routes as individual networks

  7. Topology

  8. R1’s Routing Table Let’s see the routing table of R1

  9. “Connected Routes” What are this “C” Routes? R1 has 3 interfaces on which Global IPv6 Unicast Address have been configured These interfaces are in up and up state. So the IPv6 Prefix and Prefix length of these interfaces are added as Directly Connected Routes “C” in the IPv6 Routing Table.

  10. Connected Routes Task- List the connected routes based on the output of “show ipv6 interface brief”( R2) Assume the prefix length to be 64

  11. R1’s Routing Table Revisited Let’s revisit R1’s IPv6 Routing table What are these “L” Routes?

  12. Local Routes “L” means Local Routes Host routes to the router’s IPv6 Global Unicast addresses The router uses these routes when the packets are addressed to one of its interfaces Host route in IPv6 will have /128 prefix Please note: They are “NOT” routes to link local IPv6 Addresses Let’s issue “show ipv6 interface brief” on R1 and then issue “Show ipv6 route” to identify Local Routes

  13. Local Routes What are these 2 routes?

  14. Local Routes FF00/8 is the route to 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. FE80/10 is the link local address. So 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

  15. Local Routes Task- List the connected routes based on the output of “show ipv6 interface brief”( R3)

  16. Static Routing Static Routing is configured using ipv6 route command Let’s take an example ipv6 route 2001:db8:cafe:3333 /64 s0/0/1 Prefix Prefix Length Outgoing Interface

  17. Static Routing In point to point networks next hop is not required For eg ipv6 route 2001:db8:cafe:3333 /64 s0/0/1 We can also have global unicast address as the next hop ipv6 route 2001:db8:cafe:3333 /64 2001:db8:cafe:A003 We can also have link local address as the next hop but we need to mention the outgoing interface as the link local address can be same on different interfaces ipv6 route 2001:db8:cafe:3333 /64 fe80::3 s0/0/0 Let’s configure some static routes

  18. Static Routing Configure a static route from R1 to reach R3’s L0 interface or 2001:db8:cafe:3333::3/128 Do not use any next hop ipv6 address (Global Unicast or Link Local)

  19. PT Activity Open Routing_IPv6_Static_Route_Exit_interface in the PT folder

  20. Static Routing Step 1: Enable ipv6 unicast-routing on R1 R1(config)#ipv6 unicast-routing Step 2: Configure the static route R1(config)#ipv6 route 2001:db8:cafe:3333::/64 s0/0/0 Step 3 : Enable ipv6 unicast-routing on R3 R3(config)#ipv6 unicast-routing

  21. Static Routing Step 4 : Issue show ipv6 route command

  22. Static Routing Step 5: Verify the connectivity from R1 using Ping R1#ping 2001:db8:cafe:3333::3 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:db8:cafe:3333::3, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 5/7/11 ms

  23. Static Routing Configure a static route from R1 to reach R3’s L0 interface or 2001:db8:cafe:3333::3/128 Use Global IPv6 address as the next hop

  24. PT Activity Open Routing_IPv6_Static_Route_Global_Unicast_as_Next_Hop in the PT folder

  25. Static Routing Step 1: Enable ipv6 unicast-routing on R1 R1(config)#ipv6 unicast-routing Step 2: Configure the static route R1(config)#ipv6 route 2001:db8:cafe:3333::/64 2001:db8:cafe:A001::3 Step 3 : Enable ipv6 unicast-routing on R3 R3(config)#ipv6 unicast-routing

  26. Static Routing Step 4:Issue the show ipv6 route command on R1

  27. Static Routing Step 5: Verify the connectivity from R1 using Ping R1#ping 2001:db8:cafe:3333::3 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:db8:cafe:3333::3, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 5/7/11 ms

  28. Static Routing Configure a static route from R1 to reach R2’s L0 interface or 2001:db8:cafe:2222::2/128 Use link local address of R2 as the next hop

  29. PT Activity Open Routing_IPv6_Static_Route_Link_Local_as_Next_Hop in the PT folder

  30. Static Routing Step 1: Enable ipv6 unicast-routing on R1 R1(config)#ipv6 unicast-routing Step 2: Configure the static route R1(config)#ipv6 route 2001:db8:cafe:2222::/64 s0/0/1 fe80::2 Step 3 : Enable ipv6 unicast-routing on R2 R2(config)#ipv6 unicast-routing

  31. Static Routing Step 4:Issue the show ipv6 route command

  32. Static Routing Step 5: Verify the connectivity from R1 using Ping R1#ping 2001:db8:cafe:2222::2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:db8:cafe:2222::2 timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 5/7/11 ms

  33. Static Routing :Floating Static IPv6 Route Configure a static route from R3 to reach R2’s L0 interface or 2001:db8:cafe:2222::2/128 Use global unicast address as the next hop. Let the AD be 1 Configure a static route from R3 to reach R2’s L0 interface or 2001:db8:cafe:2222::2/128 Use link local address of R2 as the next hop.Let the AD be 5

  34. Static Routing

  35. PT Activity Please open Routing_IPv6_Static_Route_Floating_Static_Route in the PT folder.

  36. Static Routing Step 1: Enable ipv6 unicast-routing on R3 R3(config)#ipv6 unicast-routing Step 2: Configure the static routes R3(config)# ipv6 route 2001:DB8:CAFE:2222::/64 2001:DB8:CAFE:A003::2 R3(config)# ipv6 route 2001:DB8:CAFE:2222::/64 Serial0/0/1 FE80::2 5 Step 3 : Enable ipv6 unicast-routing on R2 R2(config)#ipv6 unicast-routing

  37. Static Routing Step 4:Issue the show ipv6 route command on R3

  38. Static Routing Step 5: Verify the connectivity from R3 using Ping R3#ping 2001:db8:cafe:2222::2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:db8:cafe:2222::2 timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 5/7/11 ms

  39. Static Routing Step 6: Let us the remove the static route R3(config)# no ipv6 route 2001:DB8:CAFE:2222::/64 2001:DB8:CAFE:A003::2

  40. Static Routing Step 7: Issue show ipv6 route on R3

  41. Static Routing Step 8: Verify the connectivity from R3 using Ping R3#ping 2001:db8:cafe:2222::2 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:db8:cafe:2222::2 timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 5/7/11 ms

  42. Default Route Configure a Default route on R1 pointing towards 2001:db8:cafe:A001::3

  43. PT Activity Please open Routing_IPv6_Default_Route in the PT folder.

  44. Static Routing Step 1: Enable ipv6 unicast-routing on R1 R1(config)#ipv6 unicast-routing Step 2: Configure the default route R1(config)#ipv6 route ::/0 2001:db8:cafe:A001::3 Step 3 : Enable ipv6 unicast-routing on R3 R3(config)#ipv6 unicast-routing

  45. Static Routing Step 4:Issue the show ipv6 route command

  46. Static Routing Step 5: Verify the connectivity from R1 using Ping R1#ping 2001:db8:cafe:3333::3 Type escape sequence to abort. Sending 5, 100-byte ICMP Echos to 2001:db8:cafe:3333::3, timeout is 2 seconds: !!!!! Success rate is 100 percent (5/5), round-trip min/avg/max = 5/7/11 ms

  47. Other Routing Protocols Single Area OSPF v3 : Next Session EIGRP v3 : We will cover it in Teach the Trainer session for ICND2

  48. Question and Answers

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