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  OSPF Default Route Configuring OSPF Default route is not a big problem. We have couple of options when we want to OSPF default route. Here is an example R1(config)#router ospf 1  R1(config-router)#default-information originate ?   always       Always advertise default route   metric       OSPF default metric   metric-type  OSPF metric type for default routes   route-map    Route-map reference   <cr> We can change numbers of things for example metric or metric type but most of the people forget about the most important thing is the always keyword.  If we add the always command this feature advertises the default route even if we do not have in our routing table. It will look like that route is installed in routing table.   When we use the default information originate we can advertise a default route in OSPF. But OSPF won’t...

  The default route is used by IP to forward any packet with a destination not found in the routing table, which is why it is also called the gateway of last resort. Also, it can be used at an end location where there is only one exit path for any destination (internet). We can also use the default routes for better network performance. How? For example, our routers on the access layer do not need to know all our routes in our Autonomous system. When we use a default route, we can significantly reduce the size of our router routing table and surely improve our network performance on the access layer.  Default routes help in reducing the size of your routing table. It’s the least preferred route in the routing table. Let's see the configuration: Topology:  EIGRP DEFAULT ROUTE CONFIGURATION                                          ...

  EIGRP name mode operates the same way as EIGRP classic mode. EIGRP name mode provides one place for all configurations. Since IOS 15, EIGRP has had a new method of configuration called mode EIGRP.  When we use the classic EIGRP version, before IOS 15, we configured EIGRP globally and a few other things like authentication on interfaces, but with named mode EIGRP, we can do everything globally   In EIGRP name mode, we can create a single instance of EIGRP. Topology: Task configure the topology as pr the diagram  assign IP addresses to their interfaces as per our topology  configure EIGRP IPv4 name mode. R1(config)#Interface fastethernet 0/0 R1(config-if)#Ip address 10.1.1.1   255.0.0.0 R1(config-if)#No shutdown R1(config-if)#No keepalive R1(config-if)#Exit R1(config)#Interface serial 3/0 R1(config-if)#Ip address  1.1.1.1 255.0.0.0 R1(config-if)#No shut...

Route redistribution with PPP Multilink  Route redistribution allows us to take routes from one routing protocol and install those routes into different routing protocols. By default, routers only advertise the same routing protocol within the same AS. So, we need redistribution to inject different routing protocol routes into our network routing protocol. In other words, Redistribution is the process of exchanging routing information between different routing protocols. We can use redistribution when we using multiple protocols or migrating to a more advanced routing, we can use redistribution if you have a mismatch between devices (vendors) or political boundaries. Note: internal routes are routes advertised within the same protocol.           External routes are routes that get redistributed. Multilink PPP helps us to combine (bundle) multiple physical serial links into a single logical link...