On a z16 I'm involved with I noticed the Customized Planning Aid has a
section on ETS, including this paragraph:
"External Time Source (ETS) IP network considerations: For redundancy
and resiliency, The IP addresses ETS1 and ETS2 must be configured on
different subnets. When planning the Ethernet based External Time Source
network, it is required that two separate subnets corresponding to
ETS1 and ETS2 are routable to the desired NTP/PTP time source(s)."
And maybe there's more in that chapter that might help.
To get the planning aid (if you don't know), logon to Resource Link, go
to the z16 section, find "Customized planning aids" and there you have
to order the document for your machine and download it an hour or so later.
On 10/17/2022 1:03 PM, Ambros, Thomas wrote:
We've been looking but haven't been finding.
What has us puzzled is the ETS/STP interface setup on the SE. The machine is
on a /24 vlan. If we try to define each ETS LAN Adapter with an IP address and
interface subnet mask where the IP addresses are in the same subnet there is an
address conflict and the second configuration can't be saved. So we defined
subnet masks that worked as a subset of the /24 vlan and keeping the two IP
addresses in their own range we were able to save the ETS LAN Adapter configs:
ETS1 10.xx.xx.2 mask 255.255.255.0, ETS2 10.xx.xx.3 mask 255.255.255.0,
conflict.
ETS1 10.xx.xx.2 mask 255.255.255.192, ETS2 10.xx.xx.66 mask 255.255.255.192, no
conflict.
That sort of makes sense. I probably will go back in and change the subnet
mask so we move the second IP address nearer the first just to be tidy but it
isn't necessary because there's nothing on that entire vlan except the z
machines.
However, there is a single selection for the default gateway - you can choose
ETS1 or ETS2. It made sense that we'd use ETS1 and the default gateway of
10.xx.xx.1 which matches up to the vlan. That works. Just for fun we changed
off that definition and sure enough the STP network's ETS connectivity test
failed. Default gateway must match the vlan.
The single interface for the default gateway leaves us puzzled. If ETS1 fails
for some reason, we think we're going to have to go in and reconfigure ETS2 to
maintain our timer network. We can't be thinking right.
Has anybody encountered good documentation on the setup, better than Redbooks
like the Server Time Protocol setup guide that mention in passing that things
have changed but don't specify how? The z16 Tech Guide doesn't appear to have
any good info, either, unless I am totally overlooking it.
Thomas Ambros
KeyCorp Public
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