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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 https://www.juniper.net/documentation/en_US/junos/topics/topic-map/mc-lag-high-availability-l3-vrrp-macsync.html#id-example-configuring-multichassis-link-aggregation-for-layer-3-unicast-using-mac-address-synchronization

     

    "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.  

    Regards, 


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    Yasmin Lara
    Juniper Ambassador
    JNCIE-SP, JNCIE-ENT, JNCIE-DC, JNCIE-SEC
    JNCDS-DC, JNCIA-DevOps, JNCIP-CLOUD, CCNP-ENT
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  • 3.  RE: MC-LAG Layer 3 unicast functionality?

    Posted yesterday
    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:

    https://www.juniper.net/documentation/en_US/junos/topics/concept/best-practices-usage-notes.html#jd0e493

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

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    Regards,
    Elchin
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