enabled, use the standard reboot or ISSU procedures described in the other sections
of these instructions.
Because the nonstop-routing disable statement was not available in JUNOS Release
9.2 and earlier, if both NSR and an incompatible PIM feature are enabled on a router
to be upgraded from JUNOS Release 9.2 or earlier to a later release, you must disable
PIM before the upgrade and reenable it after the router is running the upgraded
JUNOS Software and you have entered the nonstop-routing disable statement. If your
router is running JUNOS Release 9.3 or later, you can upgrade to a later release
without disabling NSR or PIM–simply use the standard reboot or ISSU procedures
described in the other sections of these instructions.
To disable and reenable PIM:
1. On the router running JUNOS Release 9.2 or earlier, enter configuration mode
and disable PIM:
[edit]
user@host# deactivate protocols pim
user@host# commit
2. Upgrade to JUNOS Release 9.3 or later software using the instructions appropriate
for the router type. You can either use the standard procedure with reboot or
use ISSU.
3. After the router reboots and is running the upgraded JUNOS Software, enter
configuration mode, disable PIM NSR with the nonstop-routing disable statement,
and then reenable PIM:
[edit]
user@host# set protocols pim nonstop-routing disable
user@host# activate protocols pim
user@host# commit
Downgrade from Release 10.1
To downgrade from Release 10.1 to another supported release, follow the procedure
for upgrading, but replace the 10.1 jinstall package with one that corresponds to the
appropriate release.
NOTE: You cannot downgrade more than three releases. For example, if your routing
platform is running JUNOS Release 9.3, you can downgrade the software to
Release 9.0 directly, but not to Release 8.5 or earlier; as a workaround, you can first
downgrade to Release 9.0 and then downgrade to Release 8.5.
For more information, see the Junos OS Installation and Upgrade Guide.
Upgrade and Downgrade Instructions for JUNOS Release 10.1 for M Series, MX Series, and T Series Routers ■ 105
Upgrade and Downgrade Instructions for JUNOS Release 10.1 for M Series, MX Series, and T Series Routers
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