Juniper Certification | JNCIA-JUNOS | Day-4 Transit Traffic Processing

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On this session we will proceed to Transit Traffic Processing consists of all the traffic that enters an ingress (i.e., an action of going in or entering) a network port, it is compared against the forwarding table entries and it is finally forwarded out an egress (i.e., action of going out or leaving) the network port toward its destination. 


A forwarding table entry for a destination must exist for the device running the Junos OS to successfully forward transit traffic to that destination. A Transit Traffic passes through the fo rwarding plane only and is never sent to or processed by the control plane only and it is never sent to or processed by the control plane. By processing transit traffic through the forwarding plane only, platforms running the Junos OS can achieve predictably high in performance rates.

 From the above image we can see that Transit Traffic can be both ;

  • Unicast
  • Multicast
In Unicast transit traffic which enters one ingress port and it is transmitted out exactly one egress port towards it's destination.


But in Multicast transit traffic also enters the transit device through a single ingress port, it can be replicated and sent out multiple egress ports depending on the number of multicast receivers and the network environment. 
Stay tuned for more information on Juniper certification preparing for JNCIA-JUNOS examination.

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