Table 3. Feature History
Feature Name
|
Release Information
|
Description
|
Secondary ROMMON Partition Auto Upgrade
|
Cisco IOS XE Bengaluru 17.4.1 |
This feature supports secondary ROMMON partition auto upgrade
after a successful primary ROMMON partition is complete for NCS
4216 routers.
|
Secondary ROMMON Version Auto Upgrade
|
Cisco IOS XE Bengaluru 17.5.1 |
After primary ROMMON version is auto upgraded, secondary ROMMON
version auto upgrade process takes place. The secondary ROMMON
upgrade is only completed during the next planned manual reload
of the router. This is applicable to NCS 4201/4202 routers.
|
Starting with Cisco IOS XE Bengaluru release, 17.6.1, the 15.6(49r)S ROMMON
version filters the restricted ROMMON variables during the bootup.
Starting
with Cisco IOS XE Bengaluru release, 17.5.1, secondary ROMMON partition is also auto
upgraded after a successful primary ROMMON partition upgrade is complete. You can
reload the router at the next planned reload to complete the secondary ROMMON upgrade.
Note |
If the secondary ROMMON version is lesser than that of the primary ROMMON
version, the secondary ROMMON gets auto upgraded.
|
For Cisco IOS XE Amsterdam Release 17.3.x, Cisco IOS XE Bengaluru
Release 17.4.x, and earlier, the secondary ROMMON partition is not auto upgraded.
You must manually upgrade it using the upgrade rom-mon
filename command.
Starting with ROMMON release version
15.6(43r)S, ROMMON version is secure. Once the ROMMON version is upgraded, it cannot
be downgraded to a non-secure ROMMON version.
Secure ROMMON is supported from
Cisco IOS XE Amsterdam Release 17.3.1 onwards. However, it is compatible with all
the releases.
Any future secure ROMMON upgrade or downgrade is only possible
from Cisco IOS XE Amsterdam Release 17.3.1 onwards.
Any non-secure FPGA
bundled releases moving to Cisco IOS XE Bengaluru Release 17.3.x or future releases
can result in an FPGA upgrade and a ROMMON upgrade. If FPGA upgrade happens
parallely with the ROMMON upgrade, you can only expect a single reload. If FPGA
upgrade gets delayed and happens post ROMMON upgrade, two reloads are expected to
complete both the upgrade processes. This is followed by a successful bootup of the
target release image.
The router has two ROMMON regions (ROM0 and ROM1). We
recommend that the upgrade is performed on both the regions.
Note |
For Cisco IOS XE Gibraltar Release 16.9.5, Cisco IOS XE Gibraltar Release
16.12.3, Cisco IOS XE Amsterdam 17.1.x, and Cisco IOS XE Amsterdam 17.3.1, a
minimum diskspace of 2 MB is required in the boot flash memory file system for a
successful ROMMON auto upgrade process. For a diskspace lesser than 2 MB, ROMMON
auto upgrade fails and the router reboots.
|
Note |
Routers running a ROMMON version that is lower than version 15.6(33r)S is auto
upgraded to version 15.6(33r)S during a router restart. However, if a Cisco IOS
XE release with ROMMON image is bundled with a version lower than the running
ROMMON version, then the ROMMON is not auto downgraded.
|
Note |
Before installing the Cisco IOS XE Amsterdam 17.3.1, you must upgrade the
ROMMON to version 15_6_43r_s or higher to avoid bootup failure. This is
applicable to NCS 4202 routers.
|
Note |
Starting with Cisco IOS XE Amsterdam 17.3.1, While performing an auto upgrade of
ROMMON, only primary partition is upgraded. Use the upgrade rom-mon
filename command to upgrade the secondary partition of the
ROMMON. However, the router can be reloaded during the next planned reload to
complete the secondary ROMMON upgrade.
|
Caution |
To avoid actions that might make your system unable to boot, read this entire
section before starting the upgrade.
|