Examples of RE Exception Traffic

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The Routing Engine (RE) is the control plane component of Juniper Networks routers that handles the routing protocols, maintains the routing tables and communicates with other devices. When the RE encounters certain types of traffic that require special processing, it generates an exception and handles the traffic in a special way. Here are the explanations of two examples of RE exception traffic:

A. BGP updates that travel through the local router and are destined for a remote router: BGP (Border Gateway Protocol) is a routing protocol used on the internet to exchange routing information between autonomous systems (ASes). When a BGP update is received on the local router and is destined for a remote router, the RE generates an exception to process this traffic as RE exception traffic. The RE analyzes the update, updates its routing table and sends it out to the appropriate interfaces.

B. OSPF hello packets that are sent from a remote router and are destined for the local router: OSPF (Open Shortest Path First) is another routing protocol used on Juniper Networks routers to exchange routing information between neighboring routers. When an OSPF hello packet is received from a remote router and is destined for the local router, the RE generates an exception to process this traffic as RE exception traffic. The RE analyzes the packet, updates its routing table and sends it out to the appropriate interfaces.

C. Telnet traffic that is sent from a remote host and is destined for the local router: Telnet is a protocol used to remotely access a router or switch. When a Telnet session is initiated from a remote host to the local router, the RE does not generate an exception as this traffic does not require any special processing.

D. Telnet traffic that travels through the local router and is destined for a remote end host: When Telnet traffic passes through the local router and is destined for a remote end host, the RE does not generate an exception as this traffic is simply being forwarded through the router and does not require any special processing.

In summary, RE exception traffic is traffic that requires special processing by the Routing Engine due to the nature of the traffic and its impact on the routing tables. BGP updates and OSPF hello packets are examples of traffic that generate RE exceptions, while Telnet traffic does not require any special processing.