Brocade Virtual ADX Switch and Router Guide (Supporting ADX v03.1.00) - Manual (Page 124)

110 Brocade Virtual ADX Switch and Router Guide
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Configuring OSPF
6
Example
To set up the OSPF areas shown in Figure 19 on page 102, use the following method.
Virtual ADX(config-ospf-router)# area 192.5.1.0
Virtual ADX(config-ospf-router)# area 10.200.5.0
Virtual ADX(config-ospf-router)# area 10.5.0.0
Virtual ADX(config-ospf-router)# area 0.0.0.0
Virtual ADX(config-ospf-router) write memory
Syntax: area num | ip-addr
The num | ip-addr parameter specifies the area number, which can be a number or in IP address
format. If you specify an number, the number can be from 0 – 2,147,483,647.
NOTE
You can assign one area on a router interface. For example, if the system or chassis module has 16
ports, 16 areas are supported on the chassis or module.
Assign a totally stubby area
By default, the Layer 3 Switch sends summary LSAs (LSA type 3) into stub areas. You can further
reduce the number of link state advertisements (LSA) sent into a stub area by configuring the Layer
3 Switch to stop sending summary LSAs (type 3 LSAs) into the area. You can disable the summary
LSAs when you are configuring the stub area or later after you have configured the area.
This feature disables origination of summary LSAs, but the Layer 3 Switch still accepts summary
LSAs from OSPF neighbors and floods them to other neighbors. The Layer 3 Switch can form
adjacencies with other routers regardless of whether summarization is enabled or disabled for
areas on each router.
When you enter a command or apply a Web management option to disable the summary LSAs, the
change takes effect immediately. If you apply the option to a previously configured area, the Layer
3 Switch flushes all of the summary LSAs it has generated (as an ABR) from the area.
NOTE
This feature applies only when the Layer 3 Switch is configured as an Area Border Router (ABR) for
the area. To completely prevent summary LSAs from being sent to the area, disable the summary
LSAs on each OSPF router that is an ABR for the area.
This feature does not apply to Not So Stubby Areas (NSSAs).
To disable summary LSAs for a stub area, enter commands such as the following.
Virtual ADX(config-ospf-router)# area 40 stub 99 no-summary
Syntax: area num | ip-addr stub cost [no-summary]
The num | ip-addr parameter specifies the area number, which can be a number or in IP address
format. If you specify a number, the number can be from 0 – 2,147,483,647.
The stub cost parameter specifies an additional cost for using a route to or from this area and can
be from 1 – 16777215. There is no default. Normal areas do not use the cost parameter.
The no-summary parameter applies only to stub areas and disables summary LSAs from being sent
into the area.