User`s guide

Configuring OSPF Routing
Administering OSPF
MultiVoice Gateway for the MAX— User’s Guide Preliminary November 23, 1998 9-17
• A statically configured IP Route has a default of Preference=100. You can modify the
default in the IP Route profile.
When choosing which routes should be put in the routing table, the router first compares the
Preference values, preferring the lowest number. If the Preference values are equal, the router
compares the Metric field, and uses the route with the lowest Metric.
If multiple routes exist for a given address and netmask pair, the route with the lowest
Preference is best. If two routes have the same Preference, the lower Metric is better. The best
route by these criteria is the one actually used by the router. The others remain latent or hidden,
in case the best route is removed.
On Ethernet, the route preferences also include ASE-type and ASE-tag information for routes
learned from RIP. These values affect all RIP information learned across the Ethernet. To
change the route preferences on Ethernet:
1 Open Ethernet > Mod Config > Route Pref.
2 Modify the parameters to adjust Preference values. For example, to assign static routes the
same Preference value as those learned from OSPF:
Ethernet
Mod Config
Route prefs...
Static Preference=10
Rip Preference=100
RipAseType=Type2
Rip Tag=c8000000
OSPF Preference=10
Or, to change RIP metrics to Type-1:
Ethernet
Mod Config
Route prefs...
Static Preference=100
Rip Preference=100
RipAseType=Type1
Rip Tag=c8000000
OSPF Preference=10
3 Close the Ethernet profile.
Monitoring OSPF
The terminal-server command-line interface provides commands for monitoring OSPF in the
MultiVoice Gateway. To display the options, invoke the terminal-server interface (System >
Sys Diag > Term Serv) and enter the Show OSPF command. For example:
ascend% show ospf ?
show ospf ? Display help information
show ospf errors Display OSPF errors
show ospf areas Display OSPF areas
show ospf general Display OSPF general info
show ospf interfaces Display OSPF interfaces
show ospf lsdb Display OSPF link-state DB
show ospf lsa Display OSPF link-state advertisements
show ospf nbrs Display OSPF neighbors