The out of band port is on the back of the switch and is for out of band management. Page 93 of the user guide shows you where the port is located and has a good description of the port. [URL] If you are not using the port then there is no need to set the gateway for it. 
Hello, I want to check is it 8132F out-of-band default gateway is same as switch's default gateway. As I am now 8132F default gateway is not same as out-of-band default gateway. --- interface out-of-bandip address 192.168.10.210 255.255.255.0 0.0.0.0  <-- can assign another IP?exitip default-gateway 172.16.0.5ip route 0.0.0.0 0.0.0.0 172.16.0.5 253---Thanks!  
8132F Out of Band default gateway