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Setting an OSPF cost for an interface
Set an OSPF cost for an interface by using either of the following methods:
• Set the cost value in interface view.
• Set a bandwidth reference value for the interface. OSPF computes the cost with this formula:
Interface OSPF cost = Bandwidth reference value (100 Mbps) / Expected interface bandwidth
(Mbps). The expected bandwidth of an interface is configured with the bandwidth command
(see Interface Command Reference).
ï‚¡ If the calculated cost is greater than 65535, the value of 65535 is used. If the calculated cost
is less than 1, the value of 1 is used.
ï‚¡ If no cost or bandwidth reference value is configured for an interface, OSPF computes the
interface cost based on the interface bandwidth and default bandwidth reference value.
To set an OSPF cost for an interface:
1. Enter system view.
N/A
2. Enter interface view.
interface
interface-type
interface-number
N/A
3. Set an OSPF cost for
the interface.
ospf cost
cost-value
By default, the OSPF cost is calculated
according to the interface bandwidth.
For a loopback interface, the OSPF cost
is 0 by default.
To set a bandwidth reference value:
1. Enter system view.
system-view
N/A
2. Enter OSPF view.
ospf
[
process-id |
router-id
router-id |
vpn-instance
vpn-instance-name ] *
N/A
3. Set a bandwidth
reference value.
bandwidth-reference
value The default setting is 100 Mbps.
Setting the maximum number of ECMP routes
Perform this task to implement load sharing over ECMP routes.
To set the maximum number of ECMP routes:
1. Enter system view.
system-view
N/A
2. Enter OSPF view.
ospf
[
process-id |
router-id
router-id
|
vpn-instance
vpn-instance-name ]
*
N/A
3. Set the maximum number of
ECMP routes.
maximum load-balancing
number
By default, the maximum
number of ECMP routes
equals the maximum number
of ECMP routes supported by
the system.
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