Single MAC Addrese, multiple cards ?

[Eric Theroux]

Hi, we're running a two nodes cluster with 2 ethernet cards each for redundancy.

I want to support a software (in cluster mode) which is licenced based on the MAC Address.

How can I handle ethernet switchover or node failover events and keep the same MAC address to let the software run over each cards or node ?

Thanks in advance !

[G. Vrijhoeven]

Hi,

MC/SG uses alias ipadresses on nics for package ipadresses. The mac adresses are set on the servers active interface. If you want the mac adresses the same on two nodes you must have one node on standby or create a script that does a lanadmin -S etc ( check man pages) i do not advise this. This does not help you if the active lan fails to the standby interface aswell. May be it is possible to contact the software supplier and explain your configuration. May be he/she can provide a solution.

Regards,

Gideon

[Sundar_7]

hmm..interesting..

You can set the station address for a LAN card using lanadmin with -A option.

But you have to be absolutely sure that the other node is down before you can set this node's MAC address to the same as the other node.

In the package startup, you can do a lanadmin to set the MAC address, also execute a remsh to set the MAC address in the other node to something else, though I am not sure if there will be any consequences in the network communication capablities of your machine.

Use lanadmin before cmmodnet. I do believe, cluster sends out a ARP-UPDATE for the new IP to MAC mapping.

[Sundar_7]

On the local lan fail over, do you have EMS HA monitors ?

You can have a script that keeps checking for the EMS resource status of your primary LAN and when it goes down, execute a script that sets the station address on your standby lan.

Again, as noted above, I dont believe there is clean way to do this. I bet, HP support will be quick to tell you "this is not supported" incase of any problem wit the MC-SG :-)

You might want to explore other possiblities.

[Eric Theroux]

There is no node in stanby mode, both are running other application taht may fail to the other node.

The only product that I found was APA (Auto Port Agregation), but it is more expensive than the software itself !

[Eric Theroux]

EMS is there but not used by now.