![]() If the routers use the link-local address only, the directly connected networks can communicate. The routers can ping each other with the global unicast address. Via FE80::C001:1DFF:FEE0:0, Serial0/0 Router R3 R3# show ipv6 route ospf ON1 - OSPF NSSA ext 1, ON2 - OSPF NSSA ext 2 O - OSPF intra, OI - OSPF inter, OE1 - OSPF ext 1, OE2 - OSPF ext 2 I1 - ISIS L1, I2 - ISIS L2, IA - ISIS interarea, IS - ISIS summary show ipv6 route ospfĬodes: C - Connected, L - Local, S - Static, R - RIP, B - BGP To verify the OSPF has been configured properly, use the show ipv6 route ospf command in routers R1 and R3. Ipv6 ospf 1 area 0 !- Associates the Interface serial0/0 to area 0. Ipv6 ospf 1 area 2 !- Associates the Interface loopback20 to area 2. Ipv6 ospf 1 area 1 !- Enables OSPFv3 on the interface and associates the interface looback10 to area 1. Ipv6 address FD10::/64 eui-64 !- Assigned a IPv6 unicast address in EUI-64 format. This video demonstrates the key difference between the IPv6 Link-Local Address and global unicast address in Cisco IOS routers: However, router R2 is directly connected to R1 and R3 hence it can communicate with both the routers with their link-local address, because link-local addresses are used only within that local network specific to the physical interface. The routers R1 and R3 can ping each other with the IPv6 local unicast address, but not with their link-local address. ![]() This example uses the ping command to demonstrate the connectivity between the routers with link-local addresses. Loopback addresses are configured on the routers R1 and R3, and the routers use OSPFv3 to communicate with each other. Configurationįor this example, the routers R1, R2 and R3 are connected via serial interface and have the IPv6 addresses configured as mentioned in the network diagram. All IPv6 enabled interfaces have a link-local unicast address. IPv6 routers must not forward packets that have link-local source or destination addresses to other links. Routers do not forward datagram with link-local addresses. The nodes do not need a globally unique address to communicate. Link-local addresses can be used to reach the neighboring nodes attached to the same link. These addresses refer only to a particular physical link and are used for addresses on a single link for purposes such as automatic address configuration and neighbor discovery protocol. Link-local addresses can also be manually configured in the FE80::/10 format with the ipv6 address link-local command. Link-local addresses are not necessarily bound to the MAC address (configured in a EUI-64 format). Background InformationĪ link-local address is an IPv6 unicast address that can be automatically configured on any interface that uses the link-local prefix FE80::/10 (1111 1110 10) and the interface identifier in the modified EUI-64 format. Refer to Cisco Technical Tips Conventions for more information on document conventions. If your network is live, ensure that you understand the potential impact of any command. All of the devices used in this document started with a cleared (default) configuration. The information in this document was created from the devices in a specific lab environment. ![]() The information in this document is based on the Cisco 3700 series router with Cisco IOS® Software Release 12.4 (15)T1. IPv6 Address Formats found in the Cisco IOS® IPv6 Command Reference.Prerequisites RequirementsĬisco recommends that you have knowledge of these topics: ![]() This document describes how the IPv6 Link-Local address works within a network.
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