what sfp are you using in the Aerohive?
is this something that was working and now is not?
or is this something new?
Usually when it comes to fiber, the issues are usually Physical layer issue, loose connectors, bad patch cables, wrong interface types etc..
depending on your fiber connections and patch panels, the transmit and receive cables can be crossed somewhere in the middle.
you can console into the switch and try a
int eth1/25 shutdown
and then a
no int eth1/25 shutdown
maybe a reboot of the switch.
Cisco side, although I have never worked with SG300-52
make sure the interface is not err-disabled
and check the sfp
To view the results of optical tests, click Administration > Diagnostics > Optical
make sure both sides are support the same wavelengths
MGBSX1:1000BASE-SX SFP transceiver, for multimode fiber, 850 nm
wavelength, supports up to 550 m.
the distance matters depending on the fiber being used and the sfp, so make sure you are using the correct sfp for your environment
Port Name: eth1/25; Port Type: SFP;
SFP speed: 1300Mbps; media: fiber optical; type: 1000Base-SX; vendor: SOURCEPHOTONICS
Admin state: enable; Link status: down;
MAC address: xxxxxxxxx;
Auto MDIX=disable; MTU=1500;
Flow Control Rx: off; Flow Control Tx: off;
Link Debounce: 0 sec;
Last change time: 1969-12-31 17:00:00 Wednesday
octets 0; unicast frames: 0; broadcast frames: 0; multicast frames: 0; goodPkt : 0; good pause frames: 0; bad pause frames: 0; unrecogMacCntr: 0; fragmentsPkts: 0; jabberPkts: 0; macRcvError: 0; collisions: 0; lateCollisions: 0; bad octets: 0; bad CRC: 0; rx error frames: 0; undersize: 0; oversize: 0; overruns: 0;
octets: 0; unicast frames: 0; broadcast frames: 0; multicast frames: 0; excessive collision: 0; macTransmitErr: 0; goodPkts: 0; pause frames: 0; deferredPktsSent: 0;
pkts64Octets: 0; pkts65to127Octets: 0; pkts128to255Octets: 0; pkts256to511Octets: 0; pkts512to1023Octets: 0; pkts1024tomaxOctets: 0;