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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
netw
ork 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 aggr
egation settings and click the
A
pply
button to ad
d or change the settings.
The ne
w settings will a
ppear listed in the
OSPF Ar
ea
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:
P
a
r
ameter Description
Ar
ea ID
Allo
ws the entr
y the OSPF
Ar
ea ID for which the routing information will be aggregated.This Area ID must be
previously defined on the Switch.
Network Number Sometimes called the Network Address.The 32-bit number in the form of an IP address that uniquely identifies
the netw
ork that cor
r
esponds to the OSPF
Ar
ea abo
v
e.
Network Mask The corresponding network mask for the Network Number specified above.
L
SDB Type
Specifies the type of ad
dress aggregation,which is set at
Summar
y
.
Adv
er
tisement
Select Enabled or Disabled to determine whether the selected OSPF
Ar
ea will adv
er
tise it’
s summary LSDB
(Netw
ork-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.
121
Allied Telesyn AT-9724TS High-Density Layer 3 Stackable Gigabit Ethernet Switch