Configuring Networking Protocols

• Network address

• Subnetwork address

• IP subnet mask

The following global configurations are also required:

• Select a routing protocol, such as the Enhanced Interior Gateway Routing Protocol (EIGRP) or the Routing Information Protocol (RIP).

• Assign IP network numbers without specifying subnet values.

EIGRP saves bandwidth by sending routing updates only when routing information changes. The updates contain only information about the link that changed, not the entire routing table. EIGRP also takes into consideration the available bandwidth when determining the rate at which it transmits updates.

	Command	Purpose
Step 1	SLB-Switch(config)# interface fastethernet interface_number SLB-Switch(config-if)#	Enters Ethernet interface configuration mode to configure a particular Fast Ethernet interface.
Step 2	SLB-Switch(config-if)# ip address ip-address subnet-mask	Assigns an IP address and subnet mask to the interface.
Step 3	SLB-Switch(config-if)# exit SLB-Switch(config)#	Exits interface configuration mode and steps back one level to global configuration mode.
Step 4	SLB-Switch(config)# router rip SLB-Switch(config-router)#	Defines RIP as the routing protocol and starts the RIP routing process.
Step 5	SLB-Switch(config-router)# network network-number	Specifies a directly connected network based on the Network Information Center (NIC) network number—not a subnet number or individual address. The routing process associates interfaces with the appropriate addresses and begins processing packets on the specified network.
Step 6	SLB-Switch(config-router)# exit SLB-Switch(config)#	Returns to global configuration mode.
Step 7	SLB-Switch(config)# router igrp autonomous-system-number SLB-Switch(config-router)#	Define IGRP as the IP routing protocol. The autonomous system number to which this SLB switch belongs.
Step 8	SLB-Switch(config-router)# network network-number	Defines the directly connected networks that run IGRP.
Step 9	SLB-Switch(config-router)# exit SLB-Switch(config)#	Returns to global configuration mode.
Step 10	SLB-Switch(config)# router eigrp autonomous-system-number SLB-Switch(config-router)#	Defines EIGRP as the IP routing protocol. The autonomous system number to which this SLB switch belongs.
Step 11	SLB-Switch(config-router)# network network-number	Defines the directly connected networks that run EIGRP. The network number is the number of the network that is advertised by this SLB switch.
Step 12	SLB-Switch(config-router)# exit SLB-Switch(config)#	Returns to global configuration mode.
Step 13	SLB-Switch(config)# router ospf process-id SLB-Switch(config-router)#	Defines OSPF as the IP routing protocol. The process ID identifies a unique OSPF router process. This number is internal to the SLB switch only; the process ID does not have to match the process IDs on other routers.
Step 14	SLB-Switch(config-router)# network network-address wildcard-mask area area-id	Assigns an interface to a specific area. The network address is the address of directly connected networks or subnets. The wildcard mask is an inverse mask used to compare a given address with interface addressing to determine whether OSPF will use this interface. The area parameter identifies the interface as belonging to an area. The area ID specifies the area associated with the network address.
Step 15	SLB-Switch(config-router)# end SLB-Switch#	Returns to privileged EXEC mode.
Step 16	SLB-Switch# copy system:running-config nvram:startup-config	Saves your configuration changes to NVRAM.

Command	Purpose
SLB-Switch# show ip protocol	Displays values about routing timers and network information associated with the entire router. Use this information to identify a router that is suspected of delivering bad router information.
SLB-Switch# show ip route	Displays the contents of the IP routing table. The routing table contains entries for all known networks and subnetworks, and contains a code that indicates how that information was learned.
SLB-Switch# show ip interfaces	Displays the status and global parameters associated with an interface. Cisco IOS software automatically enters a directly connected route in the routing table if the interface is one through which a protocol can send and receive packets. Such an interface is marked "up." If the interface is unusable, it is removed from the routing table.
SLB-Switch# debug ip rip	Displays RIP routing updates as the updates are sent and received.
SLB-Switch# debug lss ipucast {events | errors | reload}	Displays updates sent to the interface module for the IP switching control layer.