Enhanced Routing Capabilities
Avaya X330WAN User’s Guide 37
For example: The command ip route 193.168.10.0 24 serial 1:1 permanent
creates a permanent static route to the network 193.168.10.0 24 via the Serial 1:1
interface.
Note: Permanent static routes should not be configured over Serial Layer 2
interfaces that participate in a Primary-Backup pair. For more information on
Backup interfaces, refer to "Backup Interfaces" on page 44.
Discard Route
Discard Route enables you to prevent forwarding traffic to specific networks. You
can configure a static route that drops all packets destined to it. This is called a
discard route, indicated by the “null0” parameter, and is configured using the ip
route <network> <mask> null0 command.
For example: the command ip route 134.66.0.0 16 Null0 specifies the network
134.66.0.0 16 as a discard route.
Export Default Metric
X330WAN enables you to configure the metric to be used in updates that are
redistributed from one routing protocol to another.
In RIP, the default is 1 and the maximum value is 16. In OSPF, the default is 20.
Set this value before redistribution using the default-metric command from
within the router rip or router ospf contexts. This value is used for all types of
redistributed routes, regardless of which protocol the route was learned from.
OSPF Dynamic Cost Support
An X330WAN OSPF interface can dynamically set a Cost. By default the OSPF
interface Cost is calculated based on the interface bandwidth, according to the
formula:
Cost = 100,000/bandwidth (in kbps)
The result is that the higher the bandwidth, the lower the Cost.
To manually configure the Cost of the OSPF interface:
• Statically configure the Cost using the ip ospf cost command from the
interface context. By using this option, no dynamic bandwidth updates can
change the Cost. Return to dynamic cost calculation using the no ip ospf cost
command.
• Manually set the bandwidth of the interface using the bandwidth command
from within the Interface context. In this case, the configured bandwidth and
not the actual interface bandwidth is taken into account when calculating the
cost based on the above formula.