Brocade BigIron RX Series Configuration Guide - Manual (Page 855)

BigIron RX Series Configuration Guide 777
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Configuring OSPF
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• Virtual interface – The combined bandwidth of all the ports in the port-based VLAN that
contains the virtual interface.
The default reference bandwidth is 100 Mbps. You can change the reference bandwidth to a value
from 1 – 4294967.
If a change to the reference bandwidth results in a cost change to an interface, the device sends a
link-state update to update the costs of interfaces advertised by the device.
NOTE
If you specify the cost for an individual interface, the cost you specify overrides the cost calculated
by the software.
Interface types to which the reference bandwidth does not apply
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 1.
• The cost of a virtual link is calculated using the Shortest Path First (SPF) algorithm and is not
affected by the auto-cost feature.
Changing the reference bandwidth
To change the reference bandwidth, enter a command such as the following at the OSPF
configuration level of the CLI:
BigIron RX(config-ospf-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
The costs for 10 Mbps and 100 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 <num>
The <num> parameter specifies the reference bandwidth and can be a value from 1 – 4294967.
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 following command.
BigIron RX(config-ospf-router)# no auto-cost reference-bandwidth
Define redistribution filters
Route redistribution imports and translates different protocol routes into a specified protocol type.
On the BigIron RX, redistribution is supported for static routes, ISIS, OSPF, RIP, and BGP4. OSPF
redistribution supports the import of static, ISIS, RIP, and BGP4 routes into OSPF routes.