dynamic port channel and load distribution across the interfaces on th trunk.

[santkumd528]

WS-C3750G-48TS

NOS-12.2(25)SEE2

I have a dynamic port channenl setup on Cisco+NetApp environemt where i have 6 interfaces(1Gbps) on that trunk for load balancing and reduntancy reason.

But i see the interfaces are not balanced on receives or inbound. I mean most of them are going to only 2 interfaces and other four are almost doing nothing.

I am assuming netapp ports serves the way how Cisco instructs. How i can remediate this situation? What am i missing here?

[Steven.langdale_2]

Hi

Version of Ontap?

The exact config of the vif?

Thanks

[santkumd528]

OnTap 7.3.6 and filer side dynamic multimode vif (lacp) configured. d2,d3,d6 being the filer ip address vif create lacp vif0 -b ip e0a e0b e4a e4b e4c e4d ifconfig vif0 `hostname`-vif0 mediatype auto netmask 255.255.255.0 partner vif0 -wins ifconfig vif0 alias a.b.c.d2 netmask 255.255.255.0 ifconfig vif0 alias a.b.c.d3 netmask 255.255.255.0 ifconfig vif0 alias a.b.c.d6 netmask 255.255.255.0

[santkumd528]

what is the default load balancing algorithms used in C3750( ip based?)

[Nisar Sayed]

Also, could you share what option you have checked in NetApp (System Manager) VIF settings? There are three options,,, Single, Multiple, LACP? - Make sure you have LACP selected. And load balance type? IP based or Mac based? Check this article, which provided you good info:

http://blog.scottlowe.org/2008/01/08/lacp-with-cisco-switches-and-netapp-vifs/

Thanks,

Nisar Sayed

[santkumd528]

I have alerady mentioned "lacp" in my my last post. Also my understanding  LB is set at switch side , not at filer side. Becase i dont have config at filer side. Also loooking the link there also  dont see a config which says use a particular LB.But the article clearly says to use "ip load balace", no clue though where it is set.  hence my question what is the default LB used/set at switch side. http://now.netapp.com/NOW/knowledge/docs/ontap/rel727/html/ontap/nag/7vifs3.htm https://communities.netapp.com/community/netapp-blogs/sanbytes/blog/2011/12/13/what-value-does-the-leading-fc-switch-vendor-bring-to-ethernet-guest-post-by-brocade http://blog.ioshints.info/2011/04/brocade-vcs-fabric-has-almost-perfect.html may be a good reads i guess.