Junos OS

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  • 1.  Next-hop resolution requests from interface

    Posted 04-17-2018 00:52

    getting syslog message "Next-hop resolution requests from interface <id> throttled" on my MX-104 with Junos 14.2R7



  • 2.  RE: Next-hop resolution requests from interface

    Posted 04-17-2018 04:20

    Hello,

    Typically this happens when someone sends loads of packets destined to a non-existing IP on the interface.

    Example being:

    MX ge-0/0/0.0 has IP 203.0.113.1/24

    There are 2 actual hosts behind ge-0/0/0.0 : 203.0.113.2 and 203.0.113.3, the rest of IPs are unused.

    You announce the 203.0.113.0/24 route to the rest of Your network and internet.

    Someone sends packets ate high rate with dst.IP == 203.0.113.77 and src.IP=198.51.100.79

    Your MX throttles the ARP requests that are coming out of ge-0/0/0.0 and are not answered - because there is no host 203.0.113.77 in existence!

    HTH

    Thx

    Alex

     



  • 3.  RE: Next-hop resolution requests from interface
    Best Answer

    Posted 04-17-2018 05:30

    As Alex mentioned above these are requests for non-existence IPs. These messages shouldn't be a problem and is not expected to cause any service impact.