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M7i PIC Combination Limitations


In most cases, you can install PICs of different media types in the M7i router. However, configuration rules might limit certain combinations of PICs. Some PICs of different PIC families cannot be installed in PIC slots 0 and 1, or in slots 2 and 3. If you have different PIC families in the M7i router and are running Junos OS Release 10.2 or later, review the configuration rules to plan which PICs to install in your router. Consult technical bulletin PSN-2007-01-023 on the Juniper Networks Support site at for information about configuration rules for PIC combinations.

Newer Junos OS services for some PICs can require significant Internet Processor ASIC memory. Ethernet and SONET PICs typically do not use large amounts of memory. Gigabit Ethernet, ATM2, IQ serial PICs, IQE PICs, and Multiservices PICs use more. To conserve memory, you can group PICs in the same family together on the same router.

As a workaround, you can:

  • Install one PIC in a different PIC slot.

  • Remove one of the PICs from the router