2010-09-17 03:34 PM
Hi, I have a dual-controller 3140a in a QA environment with only 2 on-board GigE ports each. The current config has:
Single vif per controller
- e0a active
- e0b standby
- each nic port is attached to a separate Cisco 6509-E switch. There is a 4-gig port channel between the switches but they do not have the cross-stacking VSS module.
On each side I am going to add a 4-port GigE PCIe card and then implement:
- 2 lacp vif's - one connected to each 6509 switch - vif_lacp0, vif_lacp1
- 1 single-mode vif layered above the 2 lacp vif's.
So the config on Controller1 would look like:
vif create lacp -b ip vif_lacp0 <nics>
vif create lacp -b ip vif_lacp1 <nics>
vif create single vif_single0 vif_lacp0 vif_lacp1
vif favor vif_lacp0
* matching config with appropriate naming changes will be put on Controller2
- Controller 1 is the primary controller for Oracle DB connections (2 2-node RAC clusters)
- Controller 2 is the primary controller for a VMware vSphere cluster (8 hosts)
What I'm trying to determine and decide is whether the <nics> belonging to the lacp vif's have to be equal in number? If not I was considering making:
vif_lacp0 (active) use all 4-ports from the add-in card
vif_lacp1 (standby) use the 2-ports from the on-board card
- additional bandwidth with higher single link-loss failure on active vif's, which should be up and active almost 100% of the time
- avoid any issues if differences in chipsets b/w onboard nics and expansion card nics
- Lower bandwidth available during outages, although it would take full loss of primary 6500 to be in that situation
Anyone tried this before with good or bad results?
2010-09-17 08:47 PM
Yes this does work and is supported. Another example we have implemented in a similar manner is a single 10GbE NIC as primary then a 4x 1GbE LACP secondary. Then the single mode vif contains the single interface and the second level vif.