Need help regarding default route in cisco

hi ,

I am trying lot but i am not fully able to understood default route.
From my under standing , this means that for all routes which router don't know , send it to this addrress.

What is the difference between these commands

ip default-network 20.20.20.1
default-information originate
ip route 0.0.0.0 0.0.0.0 nullo ---- in this why he didn't choose which network to send default route

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Ryan82

This document should help clear up the differences:

Configuring a Gateway of Last Resort Using IP Commands - Cisco Systems

pham0329

mirror51 wrote: »

hi ,

I am trying lot but i am not fully able to understood default route.
From my under standing , this means that for all routes which router don't know , send it to this addrress.

What is the difference between these commands

ip default-network 20.20.20.1

default-information originate

ip route 0.0.0.0 0.0.0.0 nullo ---- in this why he didn't choose which network to send default route

ip default-network is used to advertise a default, er, network, to other routers. It essentially tells them to send anything they don't know about, to this network (not next hop address). Because it's a network and not a next hop address, the packet may have to go through more than one router to get to the gateway.

Default-information originate is used in OSPF to advertise a default route to neighboring OSPF routers

ip route is used to statically assign a default gateway to the router. As far as why Null0 is used, refer to Use a Static Route to the Null0 Interface for Loop Prevention [IP Routed Protocols] - Cisco Systems