5508 LAG bundle connected to Nexus

Question

Currently setting up a 5508 WLC connected to a Nexus C7010 running 5.1(1) code.
WLC setup guide recommends the switch the WLC is connected to runs src-dst-ip load balancing on the LAG bundle. The setup guide also makes reference to 6500 switches running versions of IOS which adds the VLAN number to the hash function and advises this is incompatible with the WLC.
This appears to be the case with the Nexus as the show command illustrates:
name# sh port-channel load-balance
Port Channel Load-Balancing Configuration:
System: src-dst ip-vlan
Port Channel Load-Balancing Addresses Used Per-Protocol:
Non-IP: src-dst mac
IP: src-dst ip-vlan
The Nexus does not appear to have a purely src-dst ip load balancing option as show below
name(config)# port-channel load-balance src-dst ?
  ip-l4port       IP and L4 port
  ip-l4port-vlan  IP, L4 port and VLAN
  ip-vlan         IP and VLAN
  l4port          L4 port
  mac             MAC
Anyone got any idea which option should I use for compatibility with the 5508 and its LAG connection?

Answer 1

Hello Erick,
As of now, pure src-dst-ip load balancing is not available on the N7K and, yes, we had reports that with any other method things could break between the 5508 and the N7K.
You might want to test with src-dst ip-vlan (this is the closest one), but we saw previous issues already: the only way around for a 5508 connected to an N7K is through a single port, or with a switch in between that can do src-dst-ip load balancing.
To address this, an (internally visible) enhancement request for the N7K has been filed:
http://tools.cisco.com/Support/BugToolKit/search/getBugDetails.do?method=fetchBugDetails&bugId=CSCtf19657
The src-dst-ip load balancing method should be available on the N7K starting from 5.1.2: better however to double check with the N7K CSC forum or through a standard TAC case:
http://tools.cisco.com/ServiceRequestTool/create/launch.do
Regards,
Fede
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