In extreme everything is vlan based. You need to create vlan, configure tag on vlan, add the port in vlan, configure IP address on vlan and then enable routing(ipforwarding)
create vlan test
configure vlan test tag 450
configure vlan test add port 1,2 untagged (untagged is same as Access port in cisco)
confiugre vlan test ipaddress 177.69.10.4 255.255.255.0
enable ipforwarding.