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William Wilson

United States

Member since December 02, 2012

1 stage of confusion for some CCNA and CCNP candidates is the variance amongst configuring a static default route and utilizing the Cisco routing command ip default-network.

At initially look, they seem to do the same issue. Equally configure a vacation destination to which packets ought to be routed if there is no much more particular route in the routing table.

The significant variation among these two choices is that configuring a static default route only defines a default route for the router you are configuring it on, even though ip default-network will propagate the route by means of its routing protocol.

Let us take a look at the routing tables of a hub-and-spoke network making use of the ip default-network command. R1 is the hub and R2 and R3 are the spokes. They are right linked by way of the network 172.twelve.123. /24, and every has a loopback with a 32-bit mask that are numbered in accordance to the router number (, etc.) RIP is running on all a few routers and the loopbacks are marketed.

R1 has another serial interface with the IP tackle 10 binary options trading online /24, and this network has been flagged as a default network with the command ip default-network 10... . It is not getting marketed by RIP.

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

R1show ip route

Gateway of very last resort is not set

1.../32 is subnetted, one subnets

Do is immediately related, Loopback0

R two.../eight 120/1 by means of 172.12.123.two, 000011, Serial0

R three.../8 120/1 by means of, 000011, Serial0

172.twelve../sixteen is variably subnetted, two subnets, 2 masks

Do 172.12.21./thirty is directly linked, BRI0

Do 172.twelve.123./24 is directly related, Serial0

* 10.../24 is subnetted, one subnets

Do 10.1.1 binary options trading systems . is straight linked, Serial1

On R2 and R3, a default RIP route is now noticed (code tables yet again deleted)

R2show ip route

Gateway of previous resort is to network ...

R 1.../8 one hundred twenty/1 through, 000000, Serial0.213

two.../32 is subnetted, one subnets

C two.two.2.two is immediately linked, Loopback0

R 3.../eight 120/2 through, 000000, Serial0.213

172.12../16 is variably subnetted, two subnets, 2 masks

Do 172.12.21./30 is specifically connected, BRI0

Do 172.twelve.123./24 is specifically related, Serial0.213

R* .../ one hundred twenty/1 via 172.twelve.123.1, 000000, Serial0.213

R3show ip route

Gateway of very last resort is to network ...

R one.../eight one hundred twenty/1 by means of, 000027, Serial0.31

R two.../8 a hundred and twenty/2 by means of, 000028, Serial0.31

three.../32 is subnetted, 1 subnets

C three.3.three.3 is directly connected, Loopback0

172.12../24 is subnetted, one subnets

C 172.12.123. is specifically linked, Serial0.31

R* .../ one hundred twenty/1 binary options by way of, 000028, Serial0.31

And the default route will work, due to the fact we can ping from equally R2 and R3. Since they have no other match in their routing tables, they use the default route.


Sort escape sequence to abort.

Sending 5, 100-byte ICMP Echos to, timeout is 2 seconds


Accomplishment rate is a hundred % (five/5), spherical-trip min/avg/max 68/68/68 ms


Form escape sequence to abort.

Sending five, one hundred-byte ICMP Echos to ten.1.1.1, timeout is 2 seconds


Accomplishment rate is 100 p.c (five/5), spherical-excursion min/avg/max 68/68/68 ms

When selecting whether to use a default static route or a default network, maintain in thoughts 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 neighborhood router to have the default route, a static IP route is the way to go.

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