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Packet Loss Priority in Classifier and incoming DSCP value on SRX 650

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  • 1.  Packet Loss Priority in Classifier and incoming DSCP value on SRX 650

    Posted 10-15-2017 16:26

    Hi everyone,

     

    Please consider the following example:

     

    DROp.PNG

     

    Above, the highligthed bits two bits are used to encode Packet loss priority which is used by RED to selectively drop packets during congestion.

     

    Let say we have SRX 650 that uses Classifer TOM to classify incoming packet:

    Classifier TOM forwarding-class NET-MGMT<--> DSCP 001 010, packet loss priority high.

    Will DSCP value of received packet will be modified from 001 010 to 001 11 0 because Packet loss Priority is high? If it not, the how do we indicate this packet has high packet drop priority within Forwarding-class NET-MGMT?

     

     

    Thanks and have a nice evening!!



  • 2.  RE: Packet Loss Priority in Classifier and incoming DSCP value on SRX 650
    Best Answer

     
    Posted 10-16-2017 03:22

    DSCP will not be modified unless proper rewrite rule is configured.
    While packet is processed information about forwarding class and packet loss priority is stored as a metadata.

    Regards, Wojtek