Cisco MERAKI MR57 Installation Manual page 5

The labeled "ETH0, PoE" accepts 802.3 af (in power sharing mode), 802.3at and 802.3bt power. This port is typically
used as the primary uplink to your LAN/WAN.
The labeled "ETH1, PoE" can also accept 802.3 af (in power sharing mode), 802.3at and 802.3bt power. This port is
typically used when the AP needs to support High Availability* in case of primary port failure or Power Sharing* (when
two 802.3af power sources are combined to provide 802.3at power or two 802.3at power sources are combined to
provide 802.3bt power).
Note: High Availability and Power Sharing will be available in future firmware versions
Warning: a single 802.3af power source is not supported
Warning: Some of the pre-standard 802.3at/PoE+ switches do not negotiate full 802.3at power output with the MR57
by default. For these switches (Cisco Catalyst 2960,3560, etc) the switch port that is connected to and powering up the
MR57 should be manually configured to provide 30 watts of power. This can be done by going into the interface of the
switch and setting the inline power to 30 watts using the following command
power inline consumption 30000
before actually powering up the AP. Failure to do so may result in the MR57 not receiving enough power to operate and
can remain in low power which can cause the APs to continuously reboot
Link Aggregation
The two Ethernet ports can be used in a bonded configuration. Ensure that the AP is plugged into 2 switch ports on the
same Ethernet switch that has been configured for LACP bonding. Keep in mind that the maximum bonded aggregate
10Gig wired connection to the switch. See the MR Link Aggregation Configuration Guide for more details.
Extending the LAN
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section
If only 1 Ethernet port is used to link the AP to the LAN/WAN, the second Ethernet port may be used to connect devices
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