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DHCP on IRB Interfaces

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  • 1.  DHCP on IRB Interfaces

    Posted 12-10-2019 10:35


    I am using EX 4300 running 18.1R3-S6.1. I configured DHCP Client on IRB Interface (vlan 1000). I have a DHCP Server connected in that VLAN. I do not see any DHCP activity on the EX 4300. Its stuck in INIT state forever.


    root@Juniper1> show configuration interfaces irb unit 1000
    family inet {



    root@Juniper1> show dhcp client binding
    IP address Hardware address Expires State Interface dc:38:e1:51:ac:41 0 INIT irb.0 dc:38:e1:51:ac:41 0 INIT irb.1000 dc:38:e1:51:ac:42 9535 BOUND vme.0



    Please let me know if I am missing something.


    Thanks in Advance. 


  • 2.  RE: DHCP on IRB Interfaces
    Best Answer

    Posted 12-10-2019 12:21

    Can you please first check if your irb is "up up" ? Make sure your irb is associated with your vlan properly.

    Then check "monitor traffic interface irb.x no-resolve" to see what packets comes in / goes out on your irb 

  • 3.  RE: DHCP on IRB Interfaces

    Posted 12-10-2019 16:28

    Logical interface irb.1000 (Index 559) (SNMP ifIndex 615)
    Flags: Hardware-Down Up SNMP-Traps 0x0 Encapsulation: ENET2
    Bandwidth: 1Gbps
    Routing Instance: None Bridging Domain: None
    Input packets : 0
    Output packets: 0
    Protocol inet, MTU: 1514
    Max nh cache: 75000, New hold nh limit: 75000, Curr nh cnt: 0, Curr new hold cnt: 0, NH drop cnt: 0
    Flags: Sendbcast-pkt-to-re

  • 4.  RE: DHCP on IRB Interfaces

    Posted 12-10-2019 16:56

    I figured out the issue and its working now.

    Issue was with the vlan to irb l3-interface CLI.