xStack® DGS-3620 Series Managed Switch Web UI Reference Guide
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be created for the function that accepts these packets to verify these two bits (N and E-Bit). Bits matching the
checking feature will be accepted, while other bit combinations will be dropped.
Also included in the Options field of the LSA type-7 packet, the P-Bit (propagate) is used to define whether or not to
translate the LSA type-7 packet into an LSA type-5 packet for distribution outside the NSSA.
The P-Bit
•
LSA Type-7 address ranges for OSPF areas are defined as a pair, consisting of an IP address and a
mask. The packet will also state whether or not to advertise and it will also contain an external route tag.
LSA Type-7 Packet Features
•
The NSSA ASBR will translate external routes into type-7 LSAs to be distributed on the NSSA. NSSA
ABRs will optionally translate these type-7 packets into type-5 packets to be distributed among other
OSPF areas. These type-5 packets are indiscernible from other type-5 packets. The NSSA does not
support type-5 LSAs.
•
Once border routers of the NSSA have finished translating or grouping type-7 LSAs into type-5 LSAs,
type-5 LSAs should be flushed or reset as a translation or an aggregation of other type-7 LSAs.
•
The forwarding addresses contained in translated type-5 LSAs must be set, with the exception of an
LSA address range match.
OSPFv2
OSPF Global Settings
This window is used to configure the OSPF Global settings for the Switch.
To view the following window, click
L3 Features > OSPF > OSPFv2 > OSPF Global Settings
, as shown below:
Figure 5-34 OSPF Global Settings window
The fields that can be configured or displayed are described below:
Parameter
Description
OSPF State
Click the radio buttons to enable or disable the OSPF global state.
OSPF Router 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).
Current Router ID
Display 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.
Click the
Apply
button to accept the changes made.
OSPF Area Settings
This window is used to configure the OSPF Area settings for the Switch. OSPF allows collections of contiguous
networks and hosts to be grouped together. Such a group, together with the routers having interfaces to any one of
the included networks, is called an area.
To view the following window, click
L3 Features > OSPF > OSPFv2 > OSPF Area Settings
, as shown below:
Summary of Contents for DGS-3620-28PC-EI
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