On 9/1/21 18:44, Mike via juniper-nsp wrote:
Hello,
I did an issu upgrade on an MX240 with dual routing engines, going
from 15.1R6 to 17.4R2, and I had reviewed the fine manuals
particularly concerning advance steps to ensure nonstop routing and so
forth. But during the upgrade (near the very end), the router did
offline my MPC 3D 16x 10GE, resulting in loss of routing for 5
minutes. According to juniper in their docs that state that:
"Unified ISSU is supported with Junos OS Release 17.4R1 for MX Series
routers with MPC-3D-16XGE-SFPP"
my expectations were that the card would stay online and there
would be little to no operational impact, but this clearly wasn't the
case. I am just wondering if anyone can tell me why this might have
been the case and in the future what steps I would need to take to
ensure this both otherwise stays on the air during a future software
update?
I haven't thought about ISSU since 1 year after it first made an
appearance across vendor platforms.
Are people still actually considering it, or even trying to use it?
It didn't seem - to me anyway - that it had any chance of delivering on
its promise more than a decade ago. I can't fathom that this situation
has changed in 2021, but I could be wrong.
Mark.
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