Embended or external network ???

wizzy · Post by **wizzy** » 30 Nov 2006 01:17

I have two CPU7 in duplication.

Which configuration should I use and why ????

Post by **vad** » 30 Nov 2006 02:07

If you want to have one external connection (ethernet) - use embedded ethernet - only one problem, during restart you can lose connection.
If both CPU connected to switch - forbide embedded ethernet.

wizzy · Post by **wizzy** » 30 Nov 2006 03:47

As I saw in the manual I have to change XF03 jumper on the CPU for the external network to be enabled.

Thank you vad

Post by **vad** » 30 Nov 2006 04:35

No, you can connect both CPU to switch (hub) and you can access to both CPU without problem. But in this case you must disable embedded ethernet (with XF03). If you enable this interface may be problem with switch (loop for IP packets).
If you enable embedded ethernet - you can connect only one CPU to external network. You will have access to this CPU directly and you will have access to CPU2 (external network-CPU1-embeddedb ethernet-CPU2). If CPU1 will be lost - you cannot access CPU2 (you can wait when Linux on CPU1 will started or connect patchcord to CPU2).
So external ethernet always enabled. Embedded (CPU-CPU) ethernet can be enabled, can be inhibited (the main rule - inhibit embedded ethernet if connect both CPU to external network).

spinman · Post by **spinman** » 08 Dec 2006 09:46

I would say that you should always deactivate embedded ethernet and use 2 connections to the LAN, why? you say...

Because if u have to do maintenence on the CPU1 (with the only connection to the LAN) the embedded ethernet will stop work if you remove the CPU from the cabinett.

a tip, be sure to deactivate "spannig tree" protocol on the network switch, if it exists...