The LACP Mode in Enterasys or the Port-channel mode in Cisco, have their own algorithms for the priority selection for the slave interfaces involved in the bonding.
As I am a Linux Guy I am more familiar with the Bonding in Linux envoirnment.
We can create bonding in the /etc/sysconfig/network/ifcfg-bond0,here we can define the Master Interface with the IP address and then the slave interfaces involved in the bonding process along with the Mode of the Bonding.
The Switch connected for the bonding also has it's own aggregation algorithm present which must match the with the mode set in the server.
There are 7 modes present in the Linux kernel.
Refer to the Bonding Documentation in the Linux Kernel, it will be available at the path
cat /usr/src/linux-2.6.38/Documentation/networking/bonding.txt | less
More verbose information can be found at
http://www.linuxfoundation.org/collaborate/workgroups/networking/bonding
Enterasys :
In Enterasys Switches such as N-series, the LACP Lag output Algorithm can be set for the 3 modes
DIP-SIP - Destination IP address/Source IP Address, slave interfaces are assigned on the basis of Source or Destination IP Addresses.
DA-SA - Destination MAC Addess/Source Mac Address, slave interfaces are assigned on the basis of Source or Destination MAC Addresses.
Round-Robin - Equal distribtution from the first slave to all slaves in round-robin fashion
To check for the LACP algorithm use following on the Enterasys Switch
Matrix N3 Platinum(su)->sh lacp ? Specifies the lag port(s) to display outportAlgorithm Shows lacp current ouport algorithm flowRegeneration Shows lacp flow regeneration state singleportlag Show single port lag setting state Show global lag enable state Matrix N3 Platinum(su)->sh lacp outportAlgorithm dip-sip Matrix N3 Platinum(su)->
To set the LACP outputalgorithm to different mode
Matrix N3 Platinum(su)->set lacp outportAlgorithm ? dip-sip Use sip-dip algorithm for outport determination da-sa Use da-sa algorithm for outport determination round-robin Use round-robin algorithm for outport determination Matrix N3 Platinum(su)->set lacp outportAlgorithm round-robin Matrix N3 Platinum(su)->
Hence in accordance with the Mode set on the switch we can set the mode in the Linux
After doing this the LAG groups present will use the round-robin algorithm for flow distrbution.
Remember this is the global configuration which will cause change in algorithm of all LAG ports present.
By default the dip-sip algorithm is configured in the Enterasys switches.
Cisco :
On the Cisco Catalyst Switches, the port-channel can be used in LACP mode for the operation.
The default Load-balancing method used is src-mac (Source MAC Address).
Cisco allows us to perform the dry-run of the algoritm implemented using the test command.
I have all interfaces configured in the LACP Mode (Not in PAgP).
To check what is the current algorithm
Cisco#sh etherchannel load-balance EtherChannel Load-Balancing Configuration: src-mac EtherChannel Load-Balancing Addresses Used Per-Protocol: Non-IP: Source MAC address IPv4: Source MAC address IPv6: Source MAC address Cisco#
To test the Etherchannel Algorithm used
Cisco#test etherchannel load-balance interface port-channel 1 mac 00:18:17:F1:F9:C4 E4:9F:16:C5:11:56 Would select Gi1/0/1 of Po1 Cisco#
In IP based we can use the IP address to test the etherchannel.
To see the Ether-channel algorithm present
Cisco(config)#port-channel load-balance ? dst-ip Dst IP Addr dst-mac Dst Mac Addr src-dst-ip Src XOR Dst IP Addr src-dst-mac Src XOR Dst Mac Addr src-ip Src IP Addr src-mac Src Mac Addr Cisco(config)#port-channel load-balance
Here we can see that there is the src-dst-ip & src-dst-mac which are used for inducing additional randomization using the XOR logical operation present.
Hence the load-balancing can be done using the Destination IP address or Source IP address, same goes for the MAC addresses.
To set the New Algorithm
Cisco(config)#port-channel load-balance dst-mac Cisco(config)#
Now the Load-balancing will happen through the Destination-Mac Address.I will do some more research on this and update the post.
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