Juniper Certification | JNCIA-JUNOS | Day-5 Exception Traffic Processing

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Today friends we are going to look over exception at traffic processing is traffic that is destined for the local system. Unlike transit traffic, exception traffic does not pass through local device. It requires some for of special handling.

Now let's see this simple example if you wanted to check if the router up, you would ping its loopback address. This would be regarded as Exception Traffic, as packets destined for a device requires additional processing by the Routing Engine (RE).

Traffic that requires the generation of Internet Control Message Protocol (ICMP) messages.

ICMP messages are sent to the packet’s source to report various error conditions and to respond to ping requests. 



When we see some examples of ICMP errors include destination unreachable messages, which are sent when no entry is present in the forwarding table for the packet’s destination address, and time-to-live (TTL) expired messages, which are sent when a packet’s TTL is decremented to zero. In most cases, the PFE process handles the generation of ICMP messages.

That the Junos OS sends all exception traffic destined for Routing Engine (RE) over the internal link that connects control and forwarding planes.

Junos OS rate limits exception traffic traversing the internal link to protect the RE from denial of service (DoS) attacks. During, that times of congestion, Junos OS gives preference to the local and control traffic that is destined for the Routing Engine (RE). The built-in rate is limited which is not configurable.

Stay tuned for more information on juniper certs preparation for JNCIA-JUNOS exam and also try to answer at comment section below for this important question from JNCIA -JUNOS cert JN0-103.

Q. Which statement is correct regarding exception traffic processing? (Choose one)

A. Exception traffic is only handled by the PFE.
B. Exception traffic is rate-limited across the internal link to protect the RE.
C. Exception traffic is not prioritized during times of congestion.
D. Exception traffic is forwarded based on forwarding table entries.

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