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Chapter 16 - Configuring Dynamic Routing
Note: Ensure that Antispoofing is disabled if you are constructing the above described
type of OSPF network. Antispoofing can be disabled in the Network Configuration menu,
Core Settings sub-menu.
Administrative Distances
The router may work with different routing protocols at the same time, as well as
employing local interface and statically assigned routes. An administrative distance,
(from 0 to 255) is a rating of the trustworthiness of a routing information source. For
a given route, the protocol having the lowest administrative distance will be chosen.
By default the distances for a connected interface is 0 and for a static route is 1. By
default, OSPF will set an administrative distance of 110 and RIP will set a distance of
120.
OSPF And VRRP Example Network
This network consists of three routers connected in a ring with T1/E1 links. Router 1
and 2 and the switched network represent a remote site in which the routers supply a
redundant gateway to the hosts via VRRP and the T1/E1 links supply a redundant
network connection to the rest of the network.
Figure 130: OSPF And VRRP Example
Area And Subnets
As the OSPF design is simple, an area of 0 is used. The three point-to-point T1/E1
links are placed in the area by adding 1.1.1.0/24 to it. Router 1 and 2 will include
their Ethernet links by adding subnet 1.1.2.0/24 to their area descriptions. Router 3
must also include 2.2.2.0/24 in its area description so that its existence is advertised.
RuggedCom 155
Router 2Router 1
w2ppp
w1ppp
1.1.2.1
Router 3
Host 1
VRIP = 1.1.2.254
Priority = 100
VRIP = 1.1.2.254
Priority = 50
Host 2
1.1.2.2
Switch
w2ppp
w1ppp
w1ppp
w2ppp
1.1.1.2
1.1.1.5
1.1.1.6
1.1.1.1
1.1.1.4
1.1.1.3
2.2.2.254
IP: 1.1.2.101
GW: 1.1.2.254
IP: 1.1.2.102
GW: 1.1.2.254
Host 3
IP: 2.2.2.101
GW: 2.2.2.254
Area 0