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402 Nokia Network Voyager for IPSO 4.0 Reference Guide
To set route rank
1. Click Routing Options under Configuration > Routing Configuration in the tree view.
2. Enter the route rank for each protocol; then click Apply.
These numbers do not generally need to be changed from their defaults. Be careful when
you modify these numbers; strange routing behavior might occur as a result of arbitrary
changes to these numbers.
3. To make your changes permanent, click Save.
Routing Protocol Rank Example
When a destination network is learned from two different routing protocols, (for example, RIP
and OSPF) a router must choose one protocol over another.
The figure below shows the network configuration for the example:
In the preceding figure, the top part of the network is running OSPF and the bottom part of the
network is running RIP. Nokia Platform D learns network 192.168.22.0 from two routing
protocols: RIP from the bottom of the network, and OSPF from the top of the network. When
other hosts want to go to 192.168.22.0 through Nokia Platform D, Nokia Platform D can select
one protocol route, such as an OSPF route first, to reach the destination. If that route is broken,
then Nokia Platform D uses another available route to reach the destination.
OSPF AS external routes 150
BGP routes 170
Preference of Default
00337
Nokia
Platform B
Nokia
Platform A
Nokia
Platform D
26.69/3026.66/30
Nokia
Platform C
26.73/3026.70/30
26.65/30 26.74/30
26.61/24 26.77/28
26.79/28 26.80/28
26.78/28
26.1/24
0.0.0.0/0
24.0/24
22.0/24
Nokia OSPF Backbone
RIP to OSPF Border
RIP Network
UNIX Hosts with
Routed Enabled
Hub
Corporate Net