JUNOS Internet Software Network Operations Guide: Hardware
580 ! Understanding M40e Router Redundant SFM Configuration
Understanding M40e Router Redundant SFM Configuration
You can configure which SFM is the master and which is the backup. By default, the
SFM in slot 0 is the master and the SFM in slot 1 is the backup. You can modify the
default configuration by including the
sfm statement at the [edit chassis redundancy]
hierarchy level.
To display the current SFM redundancy configuration, follow these steps:
1. Enter the CLI configuration mode using the following command:
user@host# configure
2. Go to the [edit chassis redundancy] hierarchy level.
3. Show the SFM configuration using the following command:
user@host# show
Understanding M40e Router Redundant SFM Operation
One or two SFMs can be installed into the midplane from the rear of the M40e
router chassis, as shown in Figure 229 on page 579. Only one SFM is active at a
time, with the optional second SFM in standby mode. Removing the standby SFM
has no effect on router function. If the active SFM fails or is removed from the
chassis, what happens depends on the number of SFMs installed:
! If there is only one SFM, forwarding halts until the SFM is replaced and online.
! If there are two SFMs, 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.
Understanding M160 Router Redundant SFM Operation
Up to four SFMs can be installed into the midplane from the rear of the M160 router
chassis, as shown in Figure 229 on page 579. All SFMs are active at the same time.
A failure or taking an SFM offline has no effect on router function unless it is the
only SFM installed. If only one SFM is installed, forwarding halts until the SFM is
replaced and is back online. If two or more SFMs are installed, forwarding continues
uninterrupted.
NOTE: We recommend that both Routing Engines have the same configuration.
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