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Redundant SFMs on the M40e and M160 Routers

The M40e and M160 routers have redundant Switching and Forwarding Modules (SFMs). The SFMs contain the Internet Processor II ASIC and two Distributed Buffer Manager ASICs. SFMs ensure that all traffic leaving the FPCs is handled properly. SFMs provide route lookup, filtering, and switching.

The M40e router holds up to two SFMs, one that is configured to act as the master and the other configured to serve as a backup in case the master fails. Removing the standby SFM has no effect on router function. If the active SFM fails or is removed from the chassis, forwarding halts until the standby SFM boots and becomes active. It takes approximately 1 minute for the new SFM to become active. Synchronizing router configuration information can take additional time, depending on the complexity of the configuration.

The M160 router holds up to four SFMs. All SFMs are active at the same time. A failure or taking an SFM offline has no effect on router function. Forwarding continues uninterrupted.

You can initiate a manual switchover by issuing the request chassis sfm master switch command. For more information, see the JUNOS System Basics and Services Command Reference.

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