9
Preference of | Default |
|
|
OSPF AS external routes | 150 |
BGP routes | 170 |
|
|
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:
Nokia |
|
26.66/30 Platform B 26.69/30 | 26.70/30 |
Nokia
Platform C 26.73/30
26.65/30 |
|
| |
Nokia | Nokia OSPF Backbone | ||
Platform A | |||
26.61/24 |
|
| |
| RIP to OSPF Border | ||
|
| 26.78/28 | |
26.1/24 |
|
| |
0.0.0.0/0 |
| UNIX Hosts with | |
24.0/24 | RIP Network | ||
Routed Enabled | |||
22.0/24 |
| ||
|
| ||
26.74/30
Nokia
Platform D
26.77/28
Hub
Corporate Net |
|
26.79/28 | 26.80/28 |
00337
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.
402 | Nokia Network Voyager for IPSO 4.0 Reference Guide |
