James K Barnett wrote:
Thanks Mark,
Well I did some checking, and I found that while the MTU on z/OS was
specified as 1400, when I displayed the interface, the actmtu was 8992.
I changed the MTUs for the eth interfaces to 8992 and now I get to a bit
further. I get to an Exchange/DR state.
The log now fills up with the following messages.
OSPF: Packet[DD] [Slave]: packet duplicated.
At least I am making some progress.
Progress is good ;-)
It's often a matter of checking _ALL_ the log files on _ALL_ hosts which
can keep you busy in a large OSPF network. The trick is to find the
"illness" and not the "symptom" ;-)
You have some packet loss, which is resulting in retransmits which are
then being recorded as duplicates. You need to find where the packets
are being dropped/rejected and why. Perhaps never received, or
truncated/corrupted.
I do remember finding messages in the kernel log when the z/Linux OSA
driver needed extra buffer space. But of course that was many, many
fixes ago, so I can't speak of any recent problems. I actually remember
initially spotting those messages on the z/VM Guest Console - so
sometimes its more than just looking at logs ;-)
If this makes it all sound a bit flaky, I should point out much of my
debugging was in the early days and once configured correctly it was all
very stable. Plus the "High Availability" of alternated route switching
paid for the pain many times over ;-)
Mark
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