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Field Description
Network Mask The IP address mask for the advertised destination.
E – bit The type of external metric.If the E - bit is set, the metric specified is a Type 2 external metric.This means the
metric is considered larger than any link state path.If the E - bit is zero,the specified metric is a Type 1 external
metric.This means that is comparable directly to the link state metric.
Forwarding Address Data traffic for the advertised destination will be forwarded to this address.If the Forwarding Address is set to
0.0.0.0,data traffic will be forwarded instead to the advertisement’s originator.
TOS The Type of Service that the following cost is relevant to.
Metric The cost of this route.The interpretation of this metric depends on the external type indication (the E - bit
above).
External Route Tag A 32-bit field attached to each external route.This is not used by the OSPF protocol itself.
General OSPF Settings
The OSPF General Setting menu allows OSPF to be enabled or disabled on the Switch – without changing the Switch’s OSPF configuration.
From the Layer 3 IP Networking folder, open the OSPF folder and click on the OSPF General Setting link.To enable OSPF,first supply an
OSPF Route ID (see
below),select
Enabled from the State drop-down menu and click the Apply button.
Figure 6- 111.OSPF Global Settings window
The following parameters are used for general OSPF configuration:
Parameter Description
OSPF Route ID
A 32-bit number (in the same format as an IP address – xxx.xxx.xxx.xxx) that uniquely identifies the Switch in
the OSPF domain.It is common to assign the highest IP address assigned to the Switch (router).In this case, it
would be 10.53.13.189,but any unique 32-bit number will do.If 0.0.0.0 is entered,the highest IP address
assigned to the Switch will become the OSPF Route ID.
Current Route ID Displays the OSPF Route ID currently in use by the Switch.This Route ID is displayed as a convenience to the
user when changing the Switch’s OSPF Route ID.
State Allows OSPF to be enabled or disabled globally on the Switch without changing the OSPF configuration.
OSPF Area ID Setting
This men
u allo
ws the configuration of OSPF
Ar
ea IDs and to designate these ar
eas as either
Normal or Stub.
Normal OSPF ar
eas allo
w Link-State Database
(LSDB) advertisements of routes to networks that are external to the area.Stub areas do not allow the LSDB advertisement of external routes.Stub areas use a
default summar
y external r
oute (0.0.0.0 or
Ar
ea 0) to reach external destinations.
To set up an OSPF Area configuration click
Configuration > Layer 3 IP Networking > OSPF > OSPF Area ID Settings link to open the following
dialog box:
Figure 6- 112.OSPF Area ID Settings and Table window
117
Allied Telesyn AT-9724TS High-Density Layer 3 Stackable Gigabit Ethernet Switch