CONTROL PLANE:
- Control plane packets are destined to or locally originated by the router itself.
- Management protocols, like Telnet, SSH, SNMP, etc. could be considered part of the control plane, but are more properly considered part of the Management Plane, which is a specific subset of the control plane.
- The Routing Information (data)Base (RIB) and Label Information Base (LIB) are processed in software and used to populate FIB(forwarding information base) and the LFIB.
- The Control plane feeds the forwarding/data plane with what it needs to create its forwarding tables and updates topology changes as they occur. The number of control packets is very very small even in a very large network. This is the reason the control plane can often be thought of as the “slow path” in legacy route once-switch-many-packet switching architectures.
- In distributed architecture platforms, routing protocols, and most other protocols, always run on the core CPU. But, there are other control plane protocols such as ARP, BFD, and ICMP that in some distributed architecture platforms have now been offloaded to the line card CPU.
- A list of functions performed in control plane are:
- Makes decisions about where traffic is sent
- Control plane packets are destined to or locally originated by the router itself
- The control plane functions include the system configuration, management, and exchange of routing table information
- The route controller exchanges the topology information with other routers and constructs a routing table based on a routing protocol, for example, RIP, OSPF or BGP
- Control plane packets are processed by the router to update the routing table information.
- It is the Signalling of the network
- Since the control functions are not performed on each arriving individual packet, they do not have a strict speed constraint and are less time-critical
- For example: STP and any IP routing protocol are examples.......
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