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IanK_37848's avatar
IanK_37848
Icon for Nimbostratus rankNimbostratus
Sep 29, 2009

LTM and presenting multiple mac address for VS

Guys

 

 

Were faced with a problem where by a router is not load balancing traffic equally between the router itself and the L2 switch downstream , this is most visible on a VS that exceeds 1gb traffic.

 

 

 

(Router) --[2 x1gb L2 links]-> (L2 switch) --[ 4gb trunk]->(BigIP.9.4.6)

 

 

 

The router vendor has advised that the router is using a mac hashing algorithm to send traffic to the destination ,and in our scenario 95% traffic is for one VS that exceeds 1gb , therefore due to the load-balancing inconsistencies of the router across their aggregated Ethernet trunk we have one link completely saturated and hardly any traffic across the other.

 

 

 

Question:

 

as the router is load balancing on the mac of the VS , is there some way creating 2 mac address for a VS ... or will this just cause more problems that what it could fix ?

 

 

 

 

 

Any toughs welcomed ...

 

 

Thanks

 

Ian
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  • hoolio's avatar
    hoolio
    Icon for Cirrostratus rankCirrostratus
    Sep 30, 2009
    Hi Ian,

     

     

    I don't think there is a way to support two MACs for the same VIP address on LTM. Could you trunk the two links instead?

     

     

    Aaron
  • IanK_37848's avatar
    IanK_37848
    Icon for Nimbostratus rankNimbostratus
    Sep 30, 2009

     

    Hi Aaron

     

     

    The two links are in a trunk configuration , but we are running a L2 vpn ( ccc ) from our one datacentre to the other to allow the two bigips's to share the same subnet ranges ..and the problem lies with load balancing over the trunk when using a L2 vpn .... were currently in communication with the vendor TAC..( for 6 months already) but in the interim i just wanted to explore other options.

     

     

    Many thanks for your response