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A single level of confusion for some CCNA and CCNP candidates is the distinction in between configuring a static default route and utilizing the Cisco routing command ip default-network.

At initial glance, they appear to do the similar thing. The two configure a spot to which packets really should be routed if there is no additional specific route in the routing table.

The important big difference amongst these two alternatives is that configuring a static default route only defines a default route for the router you might be configuring it on, although ip default-network will propagate the route by way of its routing protocol.

Let's look at the routing tables of a hub-and-spoke network working with the ip default-network command. R1 is the hub and R2 and R3 are the spokes. They are directly linked through the network 172.12.123. /24, and every single has a loopback with a 32-bit mask that are numbered according to the router number (one.one.1.one, and many others.) RIP is operating on all three routers and the loopbacks are advertised.

R1 has a different serial interface with the IP handle ten.one.one.1 /24, and this network has been flagged as a default network with the command ip default-network ten... . It is not becoming marketed by RIP.

The routing protocol will then promote this route. With RIP, the default network is advertised as ... . (With IGRP, it seems as the network variety, but is marked as day trading an IGRP Exterior route. ) This route has been designated a applicant default route on R1, as we see with the asterisk following to the 10... /24 network (code table eliminated for brevity)

R1show ip route

Gateway of previous resort is not set

one.../32 is subnetted, one subnets
Do 1.1.1.one is straight linked, Loopback0
R 2.../eight one hundred twenty/one via 172.12.123.two, 000011, Serial0
R three.../8 120/one via 172.twelve.123.3, 000011, Serial0
172.12../16 is variably subnetted, 2 subnets, two masks
C 172.twelve.21./thirty is specifically connected, BRI0
Do 172.12.123./24 is right linked, Serial0
* ten.../24 is subnetted, 1 subnets
Do 10.1.one. is straight related, Serial1

On R2 and R3, a default RIP route is now observed (code tables once more deleted)

R2show ip route
Gateway of very last resort is 172.twelve.123.one to network ...

R one.../8 120/1 by means of 172.12.123.one, 000000, Serial0.213
2.../32 is subnetted, 1 subnets
Do two.2.two.2 is specifically related, Loopback0
R 3.../8 120/two through 172.twelve.123.1, 000000, Serial0.213
172.12../sixteen is variably subnetted, 2 subnets, two masks
Do 172.twelve.21./thirty is straight connected, BRI0
C 172.12.123./24 is directly linked, Serial0.213
R* .../ 120/1 by means of 172.12.123.one, 000000, Serial0.213

R3show ip route
Gateway of final resort is to best stocks network ...

R 1.../8 120/1 via 172.12.123.one, 000027, Serial0.31
R 2.../eight a hundred and twenty/two through 172.twelve.123.one, 000028, Serial0.31
3.../32 is subnetted, 1 subnets
Do 3.3.three.3 is immediately connected, Loopback0
172.12../24 is subnetted, one subnets
Do 172.twelve.123. is straight linked, Serial0.31
R* .../ a hundred and twenty/one by means of 172.12.123.one, 000028, Serial0.31

And the default route operates, due to the fact we can ping 10.one.one.1 from the two R2 and R3. Considering that they have no other match in their routing tables, they use the default route.

R2ping ten.1.1.1

Form escape sequence to abort.
Sending 5, a hundred-byte ICMP Echos to ten.1.1.1, timeout is 2 seconds
Accomplishment rate is one hundred % (5/5), round-trip min/avg/max 68/68/68 ms

R3ping 10.one.one.one

Variety escape sequence to abort.
Sending five, 100-byte ICMP Echos to ten.one.one.one, timeout is two seconds
Success charge is a hundred percent (five/5), round-journey min/avg/max 68/68/68 ms

When choosing no matter whether to use a default static route or a default network, keep in mind that if you want the routing protocol to propagate the default route, the ip default-network command will do that for you. But if you want only the local router to have the default route, a static IP route is the way to go.
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