17 definitions associated with Routing.
A routing design in which multiple nodes advertise the same service IP address and the network directs a client to a reachable instance, often the topologically closest one. Anycast is widely used for authoritative and recursive DNS resilience.
An address or prefix that should not appear as legitimate Internet-routed source or destination space, such as unallocated, reserved, or improperly advertised space. Bogon lists change as registries allocate resources.
Classless Inter-Domain Routing, the use of variable-length prefixes rather than legacy address classes. CIDR notation combines an address with a prefix length, such as 10.20.0.0/16.
Forwarding Equivalence Class, an MPLS concept grouping packets that receive the same forwarding treatment. It can appear in network architecture documents but is not a core DDI object.
Internet Routing Registry, a collection of route and policy databases used to document intended routing relationships. IRR objects can support filtering but are distinct from RPKI cryptographic authorization.
The route with the shortest matching prefix length. When no more-specific route exists, traffic follows the least-specific matching route, often the default route.
The routing rule that chooses the matching route with the greatest prefix length. It explains why a more-specific route overrides an aggregate or default route.
The neighboring router or gateway to which a packet is forwarded on its path to a destination. DHCP can distribute default and classless routes that define next hops.
A route that discards matching traffic, often used for emergency mitigation or to make sinkhole destinations unreachable. It operates at IP routing rather than DNS policy.
The Classless Static Route option, which distributes destination prefixes and next-hop routers. It supersedes the older classful static route option for capable clients.
Combining multiple contiguous prefixes into a larger summary route. Hierarchical address planning preserves aggregation and reduces routing-table size and policy complexity.
The unintended propagation of routing information beyond its intended scope, potentially diverting or exposing traffic. DDI service anycast prefixes and BYOIP routes require filtering to prevent leaks.
An IRR database object declaring that an autonomous system intends to originate a prefix. It is used for routing-policy documentation and filter generation.
A manually configured route rather than one learned through a dynamic routing protocol. DHCP can provide limited static-route information to hosts through options.
A larger aggregate prefix that contains multiple smaller networks. Supernetting supports route summarization and hierarchical address management.
Unicast Reverse Path Forwarding, a source-validation technique that checks whether the routing table has an acceptable return path for a packet's source. Strict, loose, and feasible-path modes have different multihoming tradeoffs.
Virtual Routing and Forwarding, a separate routing-table context on a device or network. VRFs allow overlapping addresses and should be modeled explicitly in IPAM or network views.