Dell S5148F-ON OS10 Enterprise Edition User Guide Release 10.3.2E-R1 - Page 247
IPv6 routing, Stateless autoconfiguration, autoconfiguration
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• summary - (Optional) Displays an IP route summary. Defaults Command Mode Usage Information Example Not configured EXEC None OS10# show ip route Codes: C - connected S - static B - BGP, IN - internal BGP, EX - external BGP O - OSPF, IA - OSPF inter area, N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2, E1 - OSPF external type 1, E2 - OSPF external type 2, > - non-active route Gateway of last resort is not set Destination Gateway Dist/Metric Last Change C 10.1.1.0/24 via 10.1.1.1 vlan100 0/0 01:16:56 B EX 10.1.2.0/24 via 10.1.2.1 vlan101 20/0 01:16:56 O 10.1.3.0/24 via 10.1.3.1 vlan102 110/2 01:16:56 B IN 10.1.4.0/24 via 10.1.4.1 vlan103 200/0 01:16:56 Supported Releases 10.2.0E or later IPv6 routing OS10 supports IPv6 routing and addressing, including the Neighbor Discovery protocol, stateless IPv6 address autoconfiguration, and stateful IPv6 address configuration. Configure IPv6 routing for IP hosts to communicate with one another in the same network, or in different networks. Stateless autoconfiguration When an interface comes up, OS10 uses stateless autoconfiguration to generate a unique link-local IPv6 address with a FE80::/64 prefix and an interface ID generated from the MAC address. To use stateless autoconfiguration to assign a globally unique address using a prefix received in router advertisements, enter the ipv6 address autoconfig command. Stateless autoconfiguration sets an interface in host mode, and allows the interface connected to an IPv6 network to autoconfigure IPv6 addresses and communicate with other IPv6 devices on local links. A DHCP server is not required for automatic IPv6 interface configuration. IPv6 devices on a local link send router advertisement (RA) messages in response to solicitation messages received at startup. Stateless autoconfiguration of IPv6 addresses is performed using: Prefix advertisement Routers use router advertisement messages to advertise the network prefix. Hosts append their interface-identifier MAC address to generate a valid IPv6 address. Duplicate address detection An IPv6 host node checks whether that address is used anywhere on the network using this mechanism before configuring its IPv6 address. Prefix renumbering Transparent renumbering of hosts in the network when an organization changes its service provider. IPv6 provides the flexibility to add prefixes on router advertisements in response to a router solicitation (RS). By default, RA response messages are sent when an RS message is received. The system manipulation of IPv6 stateless autoconfiguration supports the router side only. Neighbor Discovery (ND) messages advertise so the neighbor can use the information to auto-configure its address. Received ND messages are not used to create an IPv6 address. Inconsistencies in router advertisement values between routers are logged. The values checked for consistency include: • Current hop limit Layer 3 247
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