ExtremeSwitching (EXOS)

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MLAG, Does the ISC vlan forward any payload traffic

  • 1.  MLAG, Does the ISC vlan forward any payload traffic

    Posted 04-28-2017 07:35
    MLAG ISC

    I have a question

    For a customer I have these options

    Between the 2 MLag switches are these options

    1. A 2 port aggregation of 1 gig links
    2. A single 10 gig link ( a newer network )
    So the trade off I have is bandwidth vs resilience.

    So this is my question

    Does the ISC vlan forward any payload traffic ? or this is purely a control channel is which case it would seem prudent to use the lower bandwidth but resilient link.



  • 2.  RE: MLAG, Does the ISC vlan forward any payload traffic

    Posted 04-28-2017 11:01
    Hi,

    there'll be traffic on the ISC in the following cases (that comes to my mind):

    - BUM traffic (broadcast, unknown unicast and multicast) will transit through ISC, to be dropped on the other end in steady state operation.

    - single attached devices, statistically ~50% of the traffic to them will transit through the ISC

    - link failure (similar to the previous case)

    - L3 traffic (VRRP) if you don't have Fabric Routing on

    - in some advanced designs with an IGP (OSPF) on top of MLAG, you can see steady traffic on the ISC as well

    Best Regards,
    Stephane


  • 3.  RE: MLAG, Does the ISC vlan forward any payload traffic

    Posted 04-28-2017 11:01
    Thankyou Stephane