The enterprise-specific Chassis Definitions for Router Model MIB contain the OIDs that are used by the Chassis MIB to identify platform and chassis components. The Chassis MIB provides information that changes often. The Chassis Definitions for Router Model MIB provide information that changes less often.
The last number in each sysObjectId, shown in Table 69, corresponds to the router model and therefore does not change.
Table 69: Router Models and Their sysObjectIds
For a downloadable version of the Chassis Definitions for Router Model MIB, see www.juniper.net/techpubs/software/junos/junos92/swconfig-net-mgmt/mib-jnx-chas-defines.txt.