Administrative Tasks
Page 236 7750 SR OS Basic System Configuration Guide
IOM cards that are not compatible with more recent chassis modes will be put into an
operationally failed state if the configuration chassis mode “force” option is used.
• Chassis mode A corresponds to iom-20g, chassis mode backwards compatible for iom-
20g-b, iom2-20g, iom3-xp
• Chassis mode B corresponds to iom-20g-b, chassis mode backwards compatible for iom2-
20g, iom3-xp
• Chassis mode C corresponds to iom2-20g, chassis mode backwards compatible for iom3-
xp
• Chassis mode D corresponds to iom3-xp
The force keyword forces an upgrade either from mode a to mode b or d with cards provisioned as
iom-20g or from mode b to mode c with cards provisioned as iom-20g-b.
The ASAP MDA can only be configured if the IOM2-20g and IOM3-XP is provisioned.
Note that, if you are in chassis-mode d and configure an IOM type as iom2-20g and then
downgrade to chassis-mode a or b (must specify force keyword), a warning appears about the
IOM downgrade. In this case, the IOM`s provisioned type will downgrade to iom-20g-b. Once this
is done, the ASAP MDA cannot be configured. The following message appears:
*A:138.120.214.68>config>system# chassis-mode b
MINOR: CHMGR #1009 Mode change requires force - card-type iom2-20g in slot 1 would change
to iom-20g-b *A:138.120.214.68>config>system# chassis-mode b force
MINOR: CHMGR #1010 Can not change mode - mda m1-choc12-as-sfp in 10/1 not supported when
card changes to iom-20g-b
If this is the desired behavior, for example, chassis-mode d is configured and IPv6 is running, you can then
downgrade to chassis-mode a or b if you want to disable IPv6.
*A:ALA-48# show chassis
===============================================================================
Chassis Information
===============================================================================
Name : ALA-48
Type : 7750 SR-12
Location : exit
Coordinates : N 45 58 23, W 34 56 12
CLLI code : abcdefg1234
Number of slots : 12
Number of ports : 246
Critical LED state : Off
Major LED state : Off
Minor LED state : Off
Over Temperature state : OK
NOTE: The iom-20g is not supported from 5.0R and later but chassis mode A is described for
backwards compatibility purposes.
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