Brocade FastIron Ethernet Switch Layer 3 Routing Configuration Guide - Manual (Page 327)

• Dead-interval: The number of seconds that a neighbor router waits for a hello packet from the device
before declaring the router is down. The range is from 1 through 65535 seconds. The default is 40
seconds.
• Hello-interval: The length of time between the transmission of hello packets. The range is from 1
through 65535 seconds. The default is 10 seconds.
• Retransmit-interval: The interval between the retransmission of link state advertisements to router
adjacencies for this interface. The range is from 0 through 3600 seconds. The default is 5 seconds.
• Transmit-delay: The period of time it takes to transmit Link State Update packets on the interface.
The range is from 0 through 3600 seconds. The default is 1 second.
NOTE
The values of the dead-interval and hello-interval parameters must be the same at both ends of a
virtual link. Therefore, if you modify the values of these parameters at one end of a virtual link, you must
make the same modifications on the other end of the link.The values of the other virtual link parameters
do not require synchronization.
For example, to change the dead-interval parameter to 60 seconds on the virtual links defined on
ABR1 and ABR2, enter the following command on ABR1.
device(config-ospf6-router)# area 1 virtual-link 10.157.22.1
dead-interval 60
Enter the following command on ABR2.
device(config-ospf6-router)# area 1 virtual-link 10.0.0.1 dead-interval 60
Syntax: [no] area {number | ipv4-address} virtual-link router-id [dead-interval seconds | hello-
interval seconds | retransmit-interval seconds | transmit-delay seconds]
The area number and ipv4-address parameters specify the transit area ID.
The router-id parameter specifies the router ID of the OSPF router at the remote end of the virtual link.
To display the router ID on a device, enter the show ip command.
The dead-interval, hello-interval, retransmit-interval, and transmit-delay parameters are described
earlier in this section.
Changing the reference bandwidth for the cost on OSPFv3 interfaces
Each interface on which OSPFv3 is enabled has a cost associated with it. The device advertises its
interfaces and their costs to OSPFv3 neighbors. For example, if an interface has an OSPF cost of 10,
the device advertises the interface with a cost of 10 to other OSPF routers.
By default, OSPF cost of an interface is based on the port speed of the interface. The software uses the
following formula to calculate the cost.
Cost = reference-bandwidth/interface-speed
By default, the reference bandwidth is 100 Mbps. If the resulting cost is less than 1, the software rounds
the cost up to 1. The default reference bandwidth results in the following costs:
• 10 Mbps port cost = 100/10 = 10
• 100 Mbps port cost = 100/100 = 1
• 1000 Mbps port cost = 100/1000 = 0.10, which is rounded up to 1
• 155 Mbps port cost = 100/155 = 0.65, which is rounded up to 1
• 622 Mbps port cost = 100/622 = 0.16, which is rounded up to 1
• 2488 Mbps port cost = 100/2488 = 0.04, which is rounded up to 1
Changing the reference bandwidth for the cost on OSPFv3 interfaces
FastIron Ethernet Switch Layer 3 Routing Configuration Guide 327
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