Brocade Multi-Service IronWare Routing Configuration Guide (Supporting R05.6.00) - Manual (Page 671)

Multi-Service IronWare Routing Configuration Guide 643
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Configuring OSPFv3
Assigning a virtual link source address
When routers at both ends of a virtual link communicate with one another, the source address
included in the packets must be a global IPv6 address. The Multi-Service IronWare software
automatically selects a global IPv6 address for each transit area and advertises this address into
the transit area of the Intra-area-prefix LSA. The automatically selected global IPv6 address for a
transit area is the first global IPv6 address of any loopback interface in the transit area. If no global
IPv6 address is available on a loopback interface in the area, then the first global IPv6 address of
the lowest-numbered interface in the UP state (belonging to the transit area) will be assigned. If no
global IPv6 address is configured on any of the OSPF interfaces in the transit area, then the virtual
links in the transit area will not operate. The automatically selected IPv6 global address is updated
whenever the previously selected IPv6 address of the interface changes, is removed, or if the
interface goes down.
NOTE
The existing selected virtual link address will not change because the global IPv6 address is now
available on a loopback interface or a lower-numbered interface in the transit area. To force the
global IPv6 address for the virtual link to be the global IPv6 address of a newly configured loopback,
or a lower-numbered interface in the area, you will have to either disable the existing selected
interface or remove the currently selected global IPv6 address from the interface.
Modifying virtual link parameters
You can modify the following virtual link parameters:
• 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.
Brocade(config-ospf6-router)# area 1 virtual-link 10.157.22.1
dead-interval 60
Enter the following command on ABR2.
Brocade(config-ospf6-router)# area 1 virtual-link 10.0.0.1 dead-interval 60