Configure Default routes on cisco routers

Default routes are static routes and are also referred to as the Gateway of Last Resort. For more information about Static routing, read this simple article http://netsyshorizon.blogspot.com/2015/02/ip-static-routing-configuration-example-tutorial.html .  Configuring default routes is used to direct packets destined to networks not found in the routing table. It will direct these packets to another router that can reach to the destination or has the route to the destination.

Looking at the above diagram, site1 router cannot reach the networks 10.10.12.0/24, 10.10.13.0/24, and 10.10.14.0/24 because they are not directly connected to it and there are no routes to reach them. So, you should configure site1 router to forward all packets destined to networks 10.10.12.0/24, 10.10.13.0/24, and 10.10.14.0/24 to the next hop router (site2)  using static route or default route.

Default route is usually used on the routers in stub network. Stub network: a network having only one connection to reach all the destinations.

Two methods to configure a default route

• Send all packets destined for networks not in my routing table to next hop router ip address 10.10.11.2
  Router(config)#ip route 0.0.0.0 0.0.0.0 10.10.11.2
• Send all packets destined for networks not in my routing table out my Serial 0/0/0 interface
   Router(config)#ip route 0.0.0.0 0.0.0.0 s0/0/0

To view the routing table which router direct the packet based on, the following route table shows that we are  using the next hop address not the exit interface. 

Site1#sh ip route

Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP

       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area

       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2

       E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP

       i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area

       * - candidate default, U - per-user static route, o - ODR

       P - periodic downloaded static route

Gateway of last resort is 10.10.11.2 to network 0.0.0.0

     10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks

C       10.10.10.0/24 is directly connected, FastEthernet0/0

C       10.10.11.0/30 is directly connected, Serial0/0/0

S*   0.0.0.0/0 [1/0] via 10.10.11.2

To watch the simple and short video on youtube

YouTube - Default Route
http://youtu.be/E5-kpZt8LU4

To download the simple and short video from mediafire

Mediafire-Default route

To download packet tracer file
 Mediafire - Default route packet tracer file

To get automatic updates, join a facebook group (netsyshorizon)
https://www.facebook.com/groups/954180217947066/

Related Links:
OSPF Cost Calculation and Configuring Bandwidth/ip ospf cost/reference bandwidth
https://youtu.be/zgqaVkQe5Sw
EIGRP Composite Metric Calculation and Configuring different delay values and Bandwidth values
https://youtu.be/GsnV4Bc3On8
Cisco router WAN Redundancy/WAN Failover and Change Routing dynamically Using IP SLA - Route Tracking
https://youtu.be/x3xZhbrX7Ww
Clock Rate vs Bandwidth - Configuring clock rate and bandwidth
https://youtu.be/rntsm5bHagI
Configure Default routes on cisco routers
https://youtu.be/E5-kpZt8LU4
Static Routing Configuration Using Packet Tracer
https://youtu.be/v05Jm4h-Zms

Keywords:

default route configuration  ; default route cisco ; default route lab ; default route tutorial ; default route ccna ; default route static routing ; default router ; cisco default route configuration ; configuring default route ; default route packet tracer ; default route ; static and default route ; cisco default route ; default static route ; what is default route ; default route definition ; default route explained ; default route explanation ; default route tutorial ; ccna ; ccnp ; ccie ; default route cisco ios ; default route cisco 0.0.0.0; default route command ; default route command cisco packet tracer ; default route config ; default route configuration on a cisco router ; default routing configuration cisco router pdf ; default routing example ; default routing metrics ; default route cisco 3750 ; default route admin distance ; default route exit interface ; default route next hop ; default router ; default route subnet mask ; default route gateway of last resort ; default route gns3 ; default route cisco router ; default route vs static route ; default route vs default gateway ; default route vs gateway of last resort; default route vs default network ; default route vs default network ; default route vs default network ; default route networking ; default route not working cisco ; default route not working cisco ; default route not working cisco ; cisco default route command ; cisco default route ipv6 ; cisco default route metric ; cisco default route interface ; cisco default route configuration ; cisco default route example ; cisco default route example ; cisco default route dhcp ; cisco default route administrative distance ; cisco default route not working ; cisco default route without gateway ; cisco default routing ; cisco default routing ; default routing metrics ; default routing and remote access class ; default routing table ; default routing configuration cisco router ; default routing pdf ; default routing configuration cisco router pdf ; default routing configuration example ; default route configuration command ; example default route ; example of default route cisco ; default route lab.