LACP/LAGG hashing on layer 4 (UDP/TCP-port) possible?

[nilsbeyer]

Hi,

is the 6450 able to perform LACP/LAGG hashing on layer 4 (UDP/TCP-port)? If yes how do I activate that?


The only setting I've found so far that has something to do with hashing:

Code: Select all

hash-control mode fdb ?
                             ^
                             XOR CRC 
 (CMM Chassis Supervision Command Set)

And what "XOR" and "CRC" actually means isn't documented excactly:

Code: Select all

hash-control mode fdb
Configures the hash control method on the switch. Depending on this configuration, hashing algorithm
used by various applications for Layer 2 table lookup is affected.
hash-control mode fdb { xor | crc }
Syntax Definitions
xor
 Sets hash control lookup to XOR mode.
crc
 Sets hashing to extended mode.
[...]
Usage Guidelines
• The hash control setting impacts the fabric load balancing for chassis based products.
• Changing the hash control mode affects the hashing algorithm for Link Aggregation and EMCP.
• Changing the hash mode requires a switch or stack reboot.

Thanks and regards,
Nils

[silvio]

Hi,
some days ago I have asked me the same questions. it seems to me that only the L2 Destination (fdb) will used for calculate the hash. CRC and XOR are only different methode to calculate the hash. But I'm not sure. Is there anybody who knows more?
thanks and regards
Silvio