Command IP NAT Enable Use This command is used to enable NAT on an interface. This command figures out whether the interface is inside or outside based on the source IP addresses of packets. IP NAT enable can not translate local router traffic. Syntax Router(config-if)#ip bandwidth-percent eigrp <AS> …

Command Frame-Relay Inverse-Arp Use This command enables frame-relay inverse-arp. Frame-relay uses inverse-map to dynamically learn remote IP addresses and its local DLCIs. Syntax Router(config-if)#frame-relay inverse-arp OR Router(config-if)#frame-relay inverse-arp ip <dlci> Example In this example we will configure R4 to use frame-relay. R4(config)#int s0/0 R4(config-if)#encapsulation frame-relay R4(config-if)#ip add 10.4.4.4 255.255.255.0 …

Command Encapsulation Frame-Relay Use This command enables frame-relay on a serial interface. Syntax Router(config-if)#encapsulation frame-relay Example In this example we will configure R4 to use frame-relay as per the diagram above. R4(config)#int s0/0 R4(config-if)#encapsulation frame-relay R4(config-if)#ip add 10.4.4.4 255.255.255.0 R4(config-if)#no shut After that we configure frame relay on …

Command PPP CHAP Hostname Use This command is used to send a hostname to a remote CHAP server for authentication. Syntax Router(config-if)#ppp chap hostname <hostname> Example In this example R1’s S1/1 interface is configured to authenticate R3 using CHAP. R1(config)#int s1/1 R1(config-if)#encapsulation ppp R1(config-if)#ppp authentication chap R1(config-if)# *Mar …

Command IP Split-Horizon EIGRP Use Split Horizon protects against routing loops by not accepting routes on the same interface that a router sends updates out. This normally has to be turned off in hub and spoke topologies to ensure full reachability. Syntax Router(config-router)#network <ip address> OR Router(config-router)#network <ip …

Command Speed Use This command is used to set the speed at which an interface opertates at. Syntax Router(config-if)#speed <number or auto> Options <number> Sets the interface to a given speed, can be 10, 100, 1000 depending on the interface type. <auto> Will autonegotiate the speed of the …

Command CDP Enable Use This command is used to enable CDP on interfaces. By default it is enabled on most interfaces except for frame-relay interfaces. Syntax Router(config-if)#cdp enable Example In this example R1’s S1/1 interface is configured to authenticate R3 using PAP. R1(config)#int fa0/0 R1(config-if)#cdp enable Here we …

Command IP OSPF Network Point to Multipoint Use This command manually sets the OSPF network type to point-to-multipoint. The point-to-multipoint network type does not have an election. Syntax Router(config-if)#ip ospf network point-to-multipoint Example In this example, we will configure R4’s frame-relay link to use the point-to-multipoint network type. …

Command IP OSPF Network Broadcast Use This command manually sets the OSPF network type to broadcast, this is a default for ethernet links. The Broadcast network type has a DR election. Syntax Router(config-if)#ip ospf network broadcast Example In this example, we will configure R4’s frame-relay link to use …

Command IP OSPF # Use Enables OSPF on an interface. Syntax Router(config-if)#ip ospf <Number> Example In this example, OSPF is enabled on int fa0/0 on R1. Before doing so, ospf is disabled at the router level on R1. The empty route table is first displayed. R1(config)#no router ospf …