Brocade Virtual ADX Switch and Router Guide (Supporting ADX v03.1.00) - Manual (Page 173)

Brocade Virtual ADX Switch and Router Guide 159
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Enabling OSPFv3
7
You can change the default reference bandwidth from 100 Mbps to a value from 1
through 4,294,967 Mbps.
If a change to the reference bandwidth results in a cost change to an interface, the Brocade device
sends a link state update to update the costs of interfaces advertised by the Brocade device.
NOTE
If you specify the cost for an individual interface, the cost you specify overrides the cost calculated
by the software.
Some interface types are not affected by the reference bandwidth and always have the same cost
regardless of the reference bandwidth in use:
• The cost of a loopback interface is always 0.
• The cost of a virtual link is calculated using the Shortest Path First (SPF) algorithm and is not
affected by the auto-cost feature.
For example, to change the reference bandwidth to 500, enter the following command:
Virtual ADX(config-ospf6-router)# auto-cost reference-bandwidth 500
The reference bandwidth specified in this example results in the following costs:
• 10 Mbps port’s cost = 500/10 = 50
• 100 Mbps port’s cost = 500/100 = 5
• 1000 Mbps port’s cost = 500/1000 = 0.5, which is rounded up to 1
• 155 Mbps port’s cost = 500/155 = 3.23, which is rounded up to 4
• 622 Mbps port’s cost = 500/622 = 0.80, which is rounded up to 1
• 2488 Mbps port’s cost = 500/2488 = 0.20, which is rounded up to 1
The costs for 10 Mbps, 100 Mbps, and 155 Mbps ports change as a result of the changed
reference bandwidth. Costs for higher-speed interfaces remain the same.
Syntax: [no] auto-cost reference-bandwidth number
The number parameter specifies the reference bandwidth and can be a value from 1 through
4,294,967. The default is 100.
To restore the reference bandwidth to its default value and thus restore the default costs of
interfaces to their default values, enter the no form of this command.
Redistributing routes into OSPFv3
In addition to specifying which routes are redistributed into OSPFv3, you can configure the following
aspects related to route redistribution:
• Default metric
• Metric type
• Advertisement of an external aggregate route
Configuring route redistribution into OSPFv3
You can configure the Brocade device to redistribute routes from the following sources into
OSPFv3: