Allied Telesis AT-9724TS Ospf Area Aggregation Settings, Ospf Host Route Settings, Network Number

OSPF Area Aggregation Settings

Area Aggregation allows all of the routing information that may be contained within an area to be aggregated into a summary LSDB advertisement of just the network address and subnet mask.This allows for a reduction in the volume of LSDB advertisement traffic as well as a reduction in the memory overhead in the Switch used to maintain routing tables.

Click the OSPF Area Aggregation Settings link to view the current settings.There are no aggregation settings configured by default, so there will not be any listed the first accessing the menu.To add a new OSPF Area Aggregation setting, click the Add button.A new menu (pictured below) appears.To change an existing configuration, click on the hyperlinked Area ID for the set you want to change.The menu to modify an existing configuration is the same as the menu used to add a new one.To eliminate an existing configuration, click the ✘ in the Delete column for the configuration being removed.

Figure 6- 118. OSPF Area Aggregation Settings window

Use the menu below to change settings or add a new OSPF Area Aggregation setting.

Figure 6- 119. OSPF Aggregation Configuration – Add window

Specify the OSPF aggregation settings and click the Apply button to add or change the settings.The new settings will appear listed in the OSPF Area Aggregation Settings table.To view the table, click the Show All OSPF Aggregation Entries link to return to the previous window.

Configure the following settings for OSPF Area Aggregation:

Parameter	Description
Area ID	Allows the entry the OSPF Area ID for which the routing information will be aggregated.This Area ID must be
Network Number	previously defined on the Switch.
	Sometimes called the Network Address.The 32-bit number in the form of an IP address that uniquely identifies
Network Mask	the network that corresponds to the OSPF Area above.
	The corresponding network mask for the Network Number specified above.
LSDB Type	Specifies the type of address aggregation, which is set at Summary.
Advertisement	Select Enabled or Disabled to determine whether the selected OSPF Area will advertise it’s summary LSDB
	(Network-Number and Network-Mask).

OSPF Host Route Settings

OSPF host routes work in a way analogous to RIP, only this is used to share OSPF information with other OSPF routers.This is used to work around problems that might prevent OSPF information sharing between routers.

Allied Telesyn AT-9724TS High-Density Layer 3 Stackable Gigabit Ethernet Switch 121