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Command IP OSPF Network point-to-point Use This command manually sets the OSPF network type to point-to-point. This is the default for serial links. The point-to-point network type does not have a DR election. Note: Point-to-point can only have a single adjaceny over a link. Syntax Router(config-if)#ip ospf network …
Command IP OSPF Priority Use This command is used to manually set the DR election priority of a link. By default all links are equal with a priority of 1. Higher is better. A priority of 0 is used to prevent a router from ever becoming DR which …
Command IP MTU Use This command changes the MTU of a link if required. It is mostly used for DSL or similar setups. Syntax Router(config-if)#ip mtu <68-1500> Example In this example, we will lower the MTU on R1’s Fa0/0 to 1492. CopyR1(config-if)#int fa0/0 R1(config-if)#ip mtu 1492 R1(config-if)#do sh …
Command IP Bandwidth-Percent Use This command is used to change how much bandwidth the EIGRP routing process can use on a link. By default EIGRP can use up to 40% of the bandwidth. This is for EIGRP operational traffic, such as queries or hellos. Syntax Router(config-if)#ip bandwidth-percent eigrp …
Command Encapsulation Dot1Q Use Allows you to use a router interface as a trunk port to a switch. This is also known as “Router on a stick” because the switch uses the router to route between VLANs. Syntax Router(config-subif)#encapsulation dot1Q <vlan> <native> Option <native> Sets the vlan on …
Command Description Use This command is used to set a description on an interface. Syntax CopyRouter(config-if)#description <line> Example In this example, we will set a description on R1’s Fa0/0 interface CopyR1(config)#int fa0/0 R1(config-if)#description "LAN link to R2"
Command Clock Rate Use This command is used to set the clock rate on serial links. While you can configure the clock rate on both ends of the serial link, the router will only accept the command on the DCE end. Note: Clock rate sets how many bits …
Command IP Address DHCP Use This command is used to set an interface’s ip address via DHCP. Syntax Router(config)#ip address dhcp Example In this example, we will set 2611XM’s Fa0/0 interface to have its IP resolved by DHCP. First, lets check the current address. Copy2611XM(config)#do show ip int …
Command IP Nat Inside Use This command is used to set an inside interface for NAT translation. Syntax Router(config-if)#ip nat inside Example In this example, we will set R2’s Fa0/0 to be an inside NAT interface. CopyR2(config)#access-list 10 permit 10.1.1.0 0.0.0.255 R2(config)#ip nat pool REACH 10.2.2.5 10.2.2.10 netmask …
Command Frame Interface-dlci Use This command sets frame-relay to only use a single DLCI. This is used for point-to-point links Syntax Router(config-if)#frame-relay interface-dlci <dlci> Example In this example, we will configure R1 to use an interface dlci of 104. CopyR1(config)#int s1/0 R1(config-if)#frame interface-dlci 104 R1(config-fr-dlci)#exit R1(config-if)#do ping 10.4.4.4 …
