SD-WAN

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Ask questions and share experiences with SD-WAN and Session Smart Router (formerly 128T).
  • 1.  Dedicated queue for control packet

     
    Posted 04-15-2019 20:49

    Hello,

    Do we have a dedicated high priority queue for control packet which is separated from user traffic? If so, which packets are assigned to the queue?(BGP, OSPF etc.) Since I found the BGP in session type as default configuration I think it may be assigned to the queue same as forwarding packet.



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    Daisuke Sato
    Senior Systems Engineer
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  • 2.  RE: Dedicated queue for control packet

    Posted 04-19-2019 12:55
    Yes, we have several dedicated queues for different types of control traffic. Inbound packets that are destined for an internal application are treated separately from forwarded packets.  An example of an internal application would be the routing stack, which would handle BGP packets. 
    Outbound BGP packets are also assigned the highest priority but they may contend with other high priority forwarding traffic when traffic engineering is enabled. When traffic engineering is disabled, all packets egressing the device will be treated the same.
    For local BGP (non SVR) the session type is not used and the packets are sent and received at highest priority. BGP over SVR packets use a generated service and the BGP session type which is defaulted to the highest priority.


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    Anna Yungelson
    Technical Lead Datapath Engineer
    MA
    (781) 203-8373
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  • 3.  RE: Dedicated queue for control packet

     
    Posted 04-21-2019 20:20
    Hi Anna,

    Thank you for explanation.
    For outbound control packet, what kind of packet is assigned the highest priority when traffic engineering enabled ? (other than BGP)

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    Daisuke Sato
    Senior Systems Engineer
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  • 4.  RE: Dedicated queue for control packet

    Posted 04-22-2019 12:57
    The control traffic would also include BFD frames, Firewall discovery frames, DHCP, as well as ARP/Icmpv6 neighbor discovery frames.

    ------------------------------
    Anna Yungelson
    Technical Lead Datapath Engineer
    MA
    (781) 203-8373
    ------------------------------