Brocade BigIron RX Series Configuration Guide - Manual (Page 1385)

BigIron RX Series Configuration Guide 1307
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Configuring OSPFv3
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For example, to change the dead interval to 60 seconds on the virtual links defined on ABR1 and
ABR2, enter the following command on ABR1.
BigIron RX(config-ospf6-router)# area 1 virtual-link 209.157.22.1
dead-interval 60
Enter the following command on ABR2.
BigIron RX(config-ospf6-router)# area 1 virtual-link 10.0.0.1 dead-interval 60
Syntax: area <number> | <ipv4-address> virtual-link <router-id> [dead-interval <seconds> |
hello-interval <seconds> | retransmit-interval <seconds> | transmit-delay <seconds>]
The area <number> | <ipv4-address> parameter specifies the transit area.
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 router, enter the show ip command.
The dead-interval, hello-interval, retransmit-interval, and transmit-delay parameters are discussed
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 Brocade device
advertises its interfaces and their costs to OSPFv3 neighbors. For example, if an interface has an
OSPF cost of ten, the Brocade device advertises the interface with a cost of ten to other OSPF
routers.
By default, an interface’s OSPF cost 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’s cost = 100/10 = 10
• 100 Mbps port’s cost = 100/100 = 1
• 1000 Mbps port’s cost = 100/1000 = 0.10, which is rounded up to 1
• 155 Mbps port’s cost = 100/155 = 0.65, which is rounded up to 1
• 622 Mbps port’s cost = 100/622 = 0.16, which is rounded up to 1
• 2488 Mbps port’s cost = 100/2488 = 0.04, which is rounded up to 1
The bandwidth for interfaces that consist of more than one physical port is calculated as follows:
• Trunk group – The combined bandwidth of all the ports.
• Virtual (Ethernet) interface – The combined bandwidth of all the ports in the port-based VLAN
that contains the virtual interface.
You can change the default reference bandwidth from 100 Mbps to a value from 1 – 4294967
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.