Deferred Mda Reset - Alcatel-Lucent 7750 Configuration Manual

Interface Configuration
Soft Reset is supported on Ethernet IMMs and on IOMs that have Ethernet MDAs provisioned.
The operator can optionally force a Soft Reset on an IOM that contains at least one MDA that
supports Soft Reset but also has an MDA that does not support Soft Reset or is operationally
down. To force Soft Reset in this case the hard-reset-unsupported-mdas keyword is used and
the supported MDAs and the card itself are soft reset while the MDAs that do not support soft
reset (or are operationally down) are hard reset.
The show card and show mda commands indicate that a soft IOM reset is occurring during the
soft reset process.
Soft Reset is not supported on the following platforms: 7450 ESS-1, 7710/7750 SR-c4. On the
7710/7750 SR-c12 platforms, Soft Reset is not supported but the ISSU procedure will avoid
resetting soft reset capable MDAs/CMAs.

Deferred MDA Reset

As part of an ISSU, soft reset is supported even if the (old) firmware version on the MDAs is not
the same as the (new) firmware version in the software load to which the operator is upgrading.
The soft reset is allowed to proceed by leaving the previous version of the firmware running while
upgrading the rest of the MDA/IOM/IMM. The operator can then issue a hard reset of the MDA/
IMM at some time in the future to upgrade the firmware.
The soft reset is only allowed to proceed if the older firmware is compatible with the new IOM/
IMM software load. Otherwise the soft reset is blocked and a hard reset must be used instead.
After a soft reset has completed, a log event will be raised if necessary to warn the operator that
the MDA (or IMM) is running older firmware and that they can perform a hard reset of the MDA
(or IMM) at some point if desired.
If the MDA/IMM is never hard reset by the operator, and then in the future another s/w upgrade is
performed, and the older firmware is no longer compatible with the newest load being upgraded
to, then the soft reset will be blocked (or an automatic hard reset will occur for Major ISSU).
Note: The operator can see if they are running with older MDA/IMM firmware at any time by
using the show mda detail command.
7750 SR Interface Configuration Guide Page 263