• 128 bit addresses.
• Simplified header with fewer fields; IPv4 has 12 fields, IPv6 has 5 fields;
• No checksum in the header. This results in more efficient process because in IPv4 the TTL is decremented at each hop, the checksum had to be recalculated at each hop, that is not the case with IPv6.
• No packet fragmentation done by the router, instead an ICMP “packket too big” message is sent to the client. Fragmentation information has been moved to an extension header.
Types of IPv6 Addresses
• Unicast — Send to one interface.
• Multicast — Send to many hosts in a group in the FF00::/8 address range.
• Anycast — Send to the nearest host in a group.
Abbreviate IPv6 Addresses
• Leading zeros in a field can be omitted.
• Contiguous fields containing zeros can be abbreviated with “::”.
• eui-64 addresses use the MAC address for the lower 64 bits of an IPv6 address. The MAC address is split in half and FFFE is placed between the two halves to make the 48 bit MAC into 64 bits, universal/local (U/L) flag (bit 7) in the OUI portion of the address is flipped as well.
sh ipv6 int — Validates the IPv6 and status of interfaces.
sh ipv6 routers — Displays IPv6 router advertisements.
sh ipv6 route — Shows the routing table. DUH.
sh ipv6 protocols — Shows parameters and state of the active IPv6 protocols.
debug ipv6 nd — Debug IPv6 neighbor discovery.
debug ipv6 routing — Display debugging messages for IPv6 routing table and route cache updates.
debug ipv6 packet — Displays the debugging messages for IPv6 packets.
ipv6 address xxxx::xxxx/xxx
ipv6 router ospf 6
no ip address
ipv6 address 2026::34:2/122
ipv6 ospf 6 area 34
sh ipv ospf neigh
sh ipv ospf
sh ipv ospf int
sh ipv ospf neigh
R4#sh ipv osp neigh Neighbor ID Pri State Dead Time Interface ID Interface 10.1.1.9 1 FULL/ - 00:00:35 14 Tunnel0
sh ipv ospf
R4#sh ipv ospf Routing Process "ospfv3 6" with ID 10.1.1.10 SPF schedule delay 5 secs, Hold time between two SPFs 10 secs Minimum LSA interval 5 secs. Minimum LSA arrival 1 secs LSA group pacing timer 240 secs Interface flood pacing timer 33 msecs Retransmission pacing timer 66 msecs Number of external LSA 0. Checksum Sum 0x000000 Number of areas in this router is 1. 1 normal 0 stub 0 nssa Reference bandwidth unit is 100 mbps Area 34 Number of interfaces in this area is 1 SPF algorithm executed 3 times Number of LSA 8. Checksum Sum 0x03A4B8 Number of DCbitless LSA 0 Number of indication LSA 0 Number of DoNotAge LSA 0 Flood list length 0
sh ipv ospf int
R4#sh ipv ospf int Tunnel0 is up, line protocol is up Link Local Address FE80::A01:10A, Interface ID 11 Area 34, Process ID 6, Instance ID 0, Router ID 10.1.1.10 Network Type POINT_TO_POINT, Cost: 11111 Transmit Delay is 1 sec, State POINT_TO_POINT, Timer intervals configured, Hello 10, Dead 40, Wait 40, Retransmit 5 Hello due in 00:00:04 Index 1/1/1, flood queue length 0 Next 0x0(0)/0x0(0)/0x0(0) Last flood scan length is 1, maximum is 3 Last flood scan time is 0 msec, maximum is 0 msec Neighbor Count is 1, Adjacent neighbor count is 1 Adjacent with neighbor 10.1.1.9 Suppress hello for 0 neighbor(s)
• IPv6 multicast address FF02::9 is the destination address for RIPng update messages.
• Link-local addresses used for next-hop addresses
• Metric is hop count and 15 is still the maximum, 16 is unreachable.
To set up a 3560 switch for IPv6 you must first configure the switch database management (SDM) template to one that supprts IPV6. The rest of the configuration is the same on a router and a layer 3 switch.
DSW1(config)#sdm prefer dual-ipv4-and-ipv6 routing DSW1(config)#^Z DSW1#wri mem DSW1#reload DSW1(config)#ipv6 cef DSW1(config)#ipv6 unicast-routing DSW1(config)#ipv6 router rip RIP_ZONE DSW1(config-rtr)#int fa0/1 DSW1(config-if)#ipv6 address 2026::2:2/122 DSW1(config-if)#ipv6 rip RIP_ZONE enable
sh ipv6 protocols — What protocols are running on what interfaces.
sh ipv6 rip RIP_ZONE — Show general RIPng information concerning the specific RIP_ZONE.
sh ipv6 rip database — Shows the routes in the RIB.
sh ipv6 rip next-hops — Next hops out of this router as seen by RIPng.
sh ipv6 protocols
R4#sh ipv6 protocols IPv6 Routing Protocol is "connected" IPv6 Routing Protocol is "static" IPv6 Routing Protocol is "ospf 6" Interfaces (Area 34): Tunnel0 Redistribution: None IPv6 Routing Protocol is "rip RIP_ZONE" Interfaces: FastEthernet0/1 FastEthernet0/0 Redistribution: Redistributing protocol ospf 6 with metric 5
sh ipv6 rip RIP_ZONE
R4#sh ipv6 rip RIP_ZONE RIP process "RIP_ZONE", port 521, multicast-group FF02::9, pid 195 Administrative distance is 120. Maximum paths is 16 Updates every 30 seconds, expire after 180 Holddown lasts 0 seconds, garbage collect after 120 Split horizon is on; poison reverse is off Default routes are not generated Periodic updates 15471, trigger updates 7 Interfaces: FastEthernet0/1 FastEthernet0/0 Redistribution: Redistributing protocol ospf 6 with metric 5
sh ipv6 rip database
R4#sh ipv6 rip database RIP process "RIP_ZONE", local RIB 2026::2:0/122, metric 2 FastEthernet0/0/FE80::212:D9FF:FEA5:1541, expires in 166 secs <strong>sh ipv6 rip next-hops</strong> R4#sh ipv6 rip next-hops RIP process "RIP_ZONE", Next Hops FE80::212:D9FF:FEA5:1541/FastEthernet0/0 [1 paths]