Here is a quick run through of how to enable DNS on your devices in your network for easy hostname reachability.
Enable Router3 (150.3.3.3) to be our DNS server
# ip dns server
Create Host A records on our DNS Server Router3
# ip host 150.1.1.1
# ip host 150.2.2.2
# ip host 150.3.3.3
Enable ip domain-lookup on each Router
# ip domain-lookup
On [...]

Best Practices for Configuring EtherChannel

EtherChannel support: All Ethernet interfaces on all modules support EtherChannel (maximum of eight interfaces), with no requirement that interfaces be physically contiguous or on the same module.
Speed and duplex: Configure all interfaces in an EtherChannel to operate at the same speed and in the same duplex mode. Also, if one interface [...]

Here are three ways you can easily add a connected network into OSPF.
Lets use g1/1 with an IP of 140.1.1.1/24
1. Use the network command
# router ospf 1
# network 140.1.1.1 0.0.0.0 area 0
2. Enable OSPF under the interface
# int g1/1
# ip ospf 1 area 0
3. Redistribute the network.
# route-map INT_G1_1 permit 10
# match interface g1/1
# router [...]