• Sent by a host to determine the link-layer address of a neighbor.
• Used to verify that a neighbor is still reachable. 
• Used for Duplicate Address Detection (DAD).

• A response to a NS message.  
• A node may also send an unsolicited message to announce a link-layer address change

• Contain prefixes that are used for on-link determination or address configuration, a suggested hop limit value,  MTU value, etc.
• Sent either periodically, or in response to a RS message.  

• When a host is booting  it sends it out requesting routers to immediately generate an RA rather than wait for their next scheduled time.

Enables Cisco Express Forwarding for IPv6

When enabled, network entries in the IPv6 routing table are reflected in the Forwarding Information Bases (FIBs).

An optional command, for an advanced Layer 3 IP switching technology for the forwarding of IPv6 packets.

ipv6 address address/prefix-length [link-local | eui-64]

Command is used to statically configure an IPv6 address and prefix on an interface.

This enables IPv6 processing on the interface

ipv6 address autoconfig [default]

Enables stateless autoconfiguration which:

Automatically configures IPv6 addresses using the interface.

Enables the IPv6 processing on the interface. 

Addresses are configured depending on the prefixes received in RA messages. 

All routes and used when specifying a default static route.

It is equivalent to the IPv4 quad-zero (0.0.0.0).

Loopback address of local host. 

Equivalent to 127.0.0.1 in IPv4

Link-local unicast address.

Similar to the Windows autoconfiguration IP address of 169.254.x.x.

The route is set with the administrative distance value higher than the administrative distance of any IGP to reach a particular destination. 

The static route functions as a backup to IGP discovered routes.

It will only be added to the routing table if the IGP entry is deleted. 

ipv6 rip NAME enable

Enable an IPv6 RIP process on an interface

The name parameter is the name of the routing process.

If the routing process does not already exist, the command will create it.

ipv6 router rip NAME

Configure the IPv6 RIP routing process

Command enters router configuration mode

ipv6 router ospfprocess-id 

Complete the OSPF network strategy and planning for your IPv6 network. (E.g., are multiple areas required?).

Enable IPv6 unicast routing using the ipv6 unicast-routing command.  

(Optional) Enter OSPFv3 router configuration mode and configure the router ID.

Enable IPv6 on the interface using the ipv6 ospf area command. 

(Optional) Configure OSPFv3 interface specific settings, including neighbor, router priority and OSPFv3 path cost. 

(Optional) Configure routing specifics from router configuration mode route summarization, stub features, and so on. 

Complete the EIGRP network strategy and planning for your IPv6 network. 

Enable IPv6 unicast routing using the ipv6 unicast-routing command.  

(Optional) Enter EIGRP router configuration mode and configure the router ID.

Enable EIGRP for IPv6 on the interface using the ipv6 eigrp command. 

(Optional) Configure EIGRP for IPv6 interface specific settings. 

(Optional) Configure routing specifics from router configuration mode. 

eigrp router-id {ip-address} 

Router(config-rtr)# no shutdown

ipv6 eigrp as-number

Enables EIGRP for IPv6 on an interface.

eigrp stub [receive-only | connected | static | summary | redistributed]

router bgp autonomous-system

bgp router-id ip-address

Define the BGP router ID.

neighbor  ipv6-address activate

Identify peer BGP routers

Enables the exchange of information with a BGP neighbor. 

The ipv6-address is the IPv6 address of the neighbor

IPv6 addresses are 128 bits, compared to IPv4’s 32 bits.

Elimination of public-to-private NAT

Elimination of broadcast addresses 

Simplified header for improved router efficiency

an integration method in which an IPv6 packet is encapsulated within IPv4.

This enables the connection of IPv6 islands without the need to convert the intermediary network to IPv6

IP address

Tunnel source 

Tunnel destination

Tunnel mode (type of tunnel)

interface tunnel number

the default tunneling protocol (configured with the tunnel mode command) on Cisco routers. 

developed by Cisco

R1(config)# interface tunnel 12

R1(config-if)# no ip address

R1(config-if)# ipv6 address 12::1/64

R1(config-if)# tunnel source loopback 101

R1(config-if)# tunnel destination 10.1.1.2

R1(config-if)# tunnel mode ipv6ip

R1(config)# ipv6 unicast-routing

R1(config)# interface tunnel 12

R1(config-if)# ipv6 rip RIPoTU enable

R1(config-if)# interface fa0/0

R1(config-if)# ipv6 rip RIPoTU enable

R1(config)# interface tunnel 12

R1(config-if)# ipv6 address 2002:AC10:6501::/128

R1(config-if)# tunnel source loopback 101

R1(config-if)# tunnel mode ipv6ip 6to4

used in situations where direct communication between IPv6-only and IPv4-only networks is desired

router converts IPv6 packets into IPv4 packets and vice versa, allowing IPv6-only devices to communicate with IPv4-only devices

R1(config)# interface fa0/0

R1(config-if)# ipv6 policy route-map PBR-SOURCE-ADDRESS

• Determine the link-local address of the neighbor
• Determine the routers on the link / default route
• Actively keep track of neighbor reachability
• To send network info from routers to hosts

• Requires 32-bit router ID
• It starts in shutdown state
• Doesn't automatically summarize
• Link-local addressing
• Configured on the interfaces

• Uses link-local addresses as source addresses
• Updates sent on UDP port 521
• Uses multicast address of FF02::9

• Uses link-local addresses as source addresses
• Configured on the interface
• Authentication using IPsec
• Multiple addresses and instances per interface
• DR/BDR identified by router ID
• Uses Multicast addresses FF02::5 and FF02::6