Routing

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dhcp l3 packet received on irb

  • 1.  dhcp l3 packet received on irb

    Posted 10 days ago
    Hi

    Need your help about the issue below

    i have an ACX4K router connected to CAS028_SR1 (main path with ospf metric 100) and a second path via CAS048 (backup with ospf metric 500). During the unavailibity of the main path (xe-0/2/0) due to OSPF issue, the trafic didn't switch to backup path (xe-0/2/1).  The ospf of the backup was stable and full.

    When i checked the logs I found this repeating message : "feb0 ACX PKT: (dhcp set params)dhcp l3 packet received on irb"

    There is ne dhcp services configured on this router. Any idea about the root cause?


    Thank you

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    DEMNA IMAD
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  • 2.  RE: dhcp l3 packet received on irb

     
    Posted 10 days ago
    This is labeled a dhcp l3 packet so it could be generated anywhere on the network with l3 reachability to this irb interface and forwarded there.

    ------------------------------
    Steve Puluka BSEET - Juniper Ambassador
    IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP)
    http://puluka.com/home
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  • 3.  RE: dhcp l3 packet received on irb

    Posted 10 days ago
    Thank you Steve,

    is there anyway to solve the issue ?

    Thanks again

    ------------------------------
    DEMNA IMAD
    ------------------------------



  • 4.  RE: dhcp l3 packet received on irb

     
    Posted 9 days ago
    The device sending the packets that you don't want will have dhcp relay enabled.  If it is a Junos device this is under forwarding options.  So you would remove this no longer valid configuration.

    [edit forwarding-options]
    dhcp-relay {
        server-group {
            test 203.0.113.21;
        }
        active-server-group test;
        group all {
            interface ge-0/0/2.0;
        }
    }


    ------------------------------
    Steve Puluka BSEET - Juniper Ambassador
    IP Architect - DQE Communications Pittsburgh, PA (Metro Ethernet & ISP)
    http://puluka.com/home
    ------------------------------



  • 5.  RE: dhcp l3 packet received on irb

     
    Posted 8 days ago
    @Demna did you figure out why traffic did not fail over to the back up path?

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    Epa-
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  • 6.  RE: dhcp l3 packet received on irb

     
    Posted 8 days ago
    @DEMNA IMAD ​l noticed you asked about dhcp, did you figure out why ospf / traffic did not fail over to the back up path ?

    ------------------------------
    EPAPHRAS MATSANGAISE
    ------------------------------



  • 7.  RE: dhcp l3 packet received on irb

    Posted 8 days ago
    Hi everyone ,

    I didn't  find the RC yet.

    @Steve :  just to inform you taht there is no forwarding-options configured on the device.

    Next month, the topology will change and the backup link will be removed. So no need to bother you more than that.

    Thank you​

    ------------------------------
    DEMNA IMAD
    ------------------------------