Allied Telesis AT-WR4500 manual Ospf backup without using a tunnel, Ospf Backup

104	AT-WR4500 Series - IEEE 802.11abgh Outdoor Wireless Routers
	RouterOS v3 Configuration and User Guide

Example

The following text can be observed just after adding an OSPF network:

admin@AT-WR4562] routing ospf> neighbor print router-id=10.0.0.204 address=10.0.0.204 priority=1 state="2-Way"

state-changes=0 ls-retransmits=0 ls-requests=0 db-summaries=0 dr-id=0.0.0.0 backup-dr-id=0.0.0.0

[admin@AT-WR4562] routing ospf>

5.3.8 Application Examples

OSPF backup without using a tunnel

Let us assume that the link between the routers OSPF-Main and OSPF-peer-1 is the main one. If it goes down, we want the traffic switch over to the link going through the router OSPF-peer-2.

This example shows how to use OSPF for backup purposes, if you are controlling all the involved routers, and you can run OSPF on them.

		Internet
main_gw 192.168.0.11
[OSPF_MAIN]		to_peer2 10.2.0.2
to_peer1 10.1.0.2		to_main 10.2.0.1
		Cost=1
		Cost=1	[OSPF_peer_2]
		Cost=1
to_main 10.1.0.1		to_peer1 10.3.0.2
[OSPF_peer_1]		backup 10.3.0.1
	Figure 13: OSPF Backup

In this example:

1.We introduce an OSPF area with area ID=0.0.0.1, which includes all three routers shown on the diagram

2.Only the OSPF-Main router will have the default route configured. Its interfaces peer1 and peer2 will be configured for the OSPF protocol. The interface main_gw will not be used for distributing the OSPF routing information

3.The routers OSPF-peer-1 and OSPF-peer-2 will distribute their connected route information, and receive the default route using the OSPF protocol