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  • 1.  irb interface on EX9208 cannot change?

    Posted 12-11-2021 13:35
    Hi all,


    I'm using EX9208 and just try change the MTU on irb interface more than 1500 but when i do show interface irb.x | match mtu it still show MTU 1500. Is there any limitation on EX9208?

    Thanks and appreciate your feedback


  • 2.  RE: irb interface on EX9208 cannot change?

    Posted 12-12-2021 05:20
    Hi please see link below,but basically you must adjust the mtu of the physical interface that the irb.0(x) interface is tied to first.
    https://www.juniper.net/documentation/us/en/software/junos/interfaces-ethernet/topics/ref/statement/mtu-edit-interfaces-ni.html

    Hope this helps!

    ------------------------------
    PETER WILSON
    ------------------------------



  • 3.  RE: irb interface on EX9208 cannot change?

     
    Posted 12-12-2021 05:22
    MTU for an IRB is determined by the lowest MTU of all interfaces in that vlan. You need to change the MTU on the physical interfaces.


  • 4.  RE: irb interface on EX9208 cannot change?

    Posted 12-12-2021 05:35
    -------------------------------------------
    Original Message:
    Sent: 12-12-2021 02:58
    From: Unknown User
    Subject: irb interface on EX9208 cannot change?

    MTU for an IRB is determined by the lowest MTU of all interfaces in that vlan. You need to change the MTU on the physical interfaces.
    Original Message:
    Sent: 12-11-2021 11:42
    From: Unknown User
    Subject: irb interface on EX9208 cannot change?

    Hi all,


    I'm using EX9208 and just try change the MTU on irb interface more than 1500 but when i do show interface irb.x | match mtu it still show MTU 1500. Is there any limitation on EX9208?

    Thanks and appreciate your feedback


  • 5.  RE: irb interface on EX9208 cannot change?

    Posted 12-12-2021 06:05
    Hi Smicker,

    So u mean i need to hard coded MTU on physical interface ge-0/0/0 & ge-0/0/1 to 9192 on both Core Switch? If just one of them then then the irb mtu by default will follow the lowest MTU on that interface as long it using that interface? For example i just hard coded MTU 9192 at ge-0/0/1 but not on ge-0/0/0.




  • 6.  RE: irb interface on EX9208 cannot change?

     
    Posted 12-12-2021 06:07
    The irb interface belongs to either a vlan on switches or a bridge domain on mx devices.

    The irb interface mtu will be the lowest mtu value out of all interfaces that also belong to that vlan or bridge domain on the device where the irb is configured.

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



  • 7.  RE: irb interface on EX9208 cannot change?

    Posted 12-12-2021 11:58
    Hi Spuluka,


    I'm using EX9208.

    Thanks


  • 8.  RE: irb interface on EX9208 cannot change?

     
    Posted 12-12-2021 12:20
    So you will need to look at all the interfaces that are assigned to the same vlan as the irb interface in question.

    Then update all of these links (remember both sides need to change so they match) to your new desired mtu size.

    Once all of them are updated your irb will be as well.

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



  • 9.  RE: irb interface on EX9208 cannot change?

    Posted 12-13-2021 05:58
    Hi Spuluka  & Smicker,


    Noted. Now i understand.

    Thanks