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MC-LAG Layer 3 unicast functionality?

  • 1.  MC-LAG Layer 3 unicast functionality?

    Posted 10-21-2020 08:59

    Hi all,


    Based on this url


    "You can choose either to synchronize the MAC addresses for the Layer 3 interfaces of the switches participating in the MC-LAG, or you can configure Virtual Router Redundancy Protocol (VRRP), but you cannot configure both at the same time."


    It said cannot use at same time. But when i look on config on that url the "mcae-mac-synchronize" was tie into irb interface. So it should not have issue right if we mix in one MC-LAG interface with VRRP and mcae-mac-synchronize with different irb? For example irb.40 i'm use VRRP method and irb.50 i'm use mcae-mac-synchronize method.


    Thanks and appreciate any feedback.



  • 2.  RE: MC-LAG Layer 3 unicast functionality?

    Posted 5 days ago
    That's an interesting questions!!! 

    I've tested MC-LAG extensively, but never tested having both VRRP and mcae-mac-synchronize at the same time as you mentioned.  I cannot  think of a reason why it would not work, BUT I would test it carefully before implementing it in production.   I would look closely at loop avoidance, and failover under different failure scenarios.  


    Yasmin Lara
    Juniper Ambassador

  • 3.  RE: MC-LAG Layer 3 unicast functionality?

    Posted 2 days ago
    Hi, it's better to identify first if you really need this type of configuration mix. Here are some recommendations and notes on using VRRP and mac-address synchronization:

    This document was really helpful when I've started configuring different features with MC-LAG installation.