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What is routing policy in networking?
In computer networking, policy-based routing (PBR) is a technique used to make routing decisions based on policies set by the network administrator. Policy-based routing may also be based on the size of the packet, the protocol of the payload, or other information available in a packet header or payload.
What is VRF instance?
Virtual routing and forwarding (VRF) is an IP-based computer network technology that enables the simultaneous co-existence of multiple virtual routers (VRs) as instances or virtual router instances (VRIs) within the same router. Packets are forwarded only between interfaces on the same VRF.
What is VRF table?
In IP-based computer networks, virtual routing and forwarding (VRF) is a technology that allows multiple instances of a routing table to co-exist within the same router at the same time.
Which is an example of a routing instance?
A routing instance is a collection of routing tables, interfaces, and routing protocol parameters. The set of interfaces belongs to the routing tables, and the routing protocol parameters control the information in the routing tables.
How are routing instances used on a Juniper router?
On a Juniper switch or router, we can create additional virtual routing tables, called routing-instances. These are similar to a VRF on a Cisco Router. Each routing instance groups routing tables (remember different tables are used for different families), interfaces, and protocol configuration into a single place.
How does routing take place in a network?
This type is the optimal path between all possible pairs of sources & destinations in the given network is pre-defined and fed into the routing table of the network’s routers. There is no CPU overhead for the routers to decide the next hop for the packet as the paths are predefined.
When to use an Ethernet VPN routing instance?
Ethernet VPN (EVPN) (MX Series routers only)—Use this routing instance type to connect a group of dispersed customer sites using a Layer 2 virtual bridge. Forwarding—Use this routing instance type for filter-based forwarding applications. For this instance type, there is no one-to-one mapping between an interface and a routing instance.