System Management
Basic System Configuration Guide 283
IOM cards that are not compatible with more recent 7450 ESS chassis modes will stay or be
put into an operationally down state.
• 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 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
(7750 SR).
On the 7750 SR, the ASAP MDA can only be configured if the IOM2-20g and IOM3-XP is
provisioned.
If you are in chassis-mode d and configure an IOM type as iom2-20g and then downgrade to
chassis-mode a or b (you 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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