WAN uses Serial ports Ethernet Ports: Straight through Cross over
Configuring a Serial interface interface configuration mode ip address and subnet mask no shutdown Example: R1(config)#interface serial 0/0 R1(config-if)# ip address 172.16.2.1 255.255.255.0 R1(config-if)#no shutdown
Examining Router Interfaces Physically connecting a WAN Interface A WAN Physical Layer connection has sides: Data Circuit-terminating Equipment (DCE) Data Terminal Equipment (DTE) Configuring serial links One side of a serial connection must be considered a DCE. Serial Interfaces require a clock signal to control the timing of the communications, by placing a clocking signal use clock rate Example: R1(config)# interface serial 0/0 R1(config-if)# clock rate 64000
Routing Table is stored in RAM and contains information about: Directly connected networks - this occurs when a device is connected to a router’s interface Remotely connected networks - this is a network that is not directly connected to a particular router Detailed information about the networks include source of information, network address & subnet mask, and Ip address of next-hop router show ip route command is used to view a routing table
Includes: Network address Subnet mask IP address of next hop router or exit interface Denoted with the code S in the routing table ip route 172.16.1.0 255.255.255.0 172.16.2.2 ip route - Static route command 172.16.1.0 – Destination network address 255.255.255.0 – Subnet mask of destination network 172.16.2.2 - Serial 0/0/0 interface IP address on R2, which is the "next-hop" to this network
Route summarization Combining a number of static routes into a single static route. Summarizing routes reduces the size of the routing table.
Configuring a summary route Step 1: Delete the current static route Step 2: Configure the summary static route Step 3: Verify the new static route
Default Static Route This is a route that will match all packets. Stub routers that have a number of static routes all exiting the same interface are good candidates for a default route Like route summarization this will reduce the size of the routing table
Configuring a default static route Similar to configuring a static route. Only one default static router per router Except that destination IP address and subnet mask are all zeros. Example: Router(config)# ip route 0.0.0.0 0.0.0.0 [exit-interface | ip-address ]
Build the network topology. Basic router configurations. Hostname Enable secret password Logging synchronous command ( Console and Virtual terminal lines) Interpret Debug output: shows when routes are added, deleted or modified from routing table. Configure LAN and WAN interfaces of router R1. Configure WAN link on R2 and R3 using console connection.(turn on debug) Turn off debugging on both routers R1 and R2. Check the routing tables on routers. Configure IP addresses on Host PCs.
Verify the configuration: from PCs to their Gateways. Verify the configuration: between routers. Check connectivity between devices on different networks. Configure the Static route using next hop Configure the Static route using exit interface. Configure Default Static route. Configure Summary Static route