NETGEAR GSM7252PS - ProSafe 52 Ports Gigabit Ethernet L2 Managed Stackable Switch User Manual page 292

ProSafe® Gigabit L3 Managed Stackable Switches Software Administration Manual
Table 35.
Field
LS ID
Age
Sequence
Checksum
Options
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292 | Chapter 4. Routing
Description
The Link State ID identifies the piece of the routing
domain that is being described by the advertisement.
The value of the LS ID depends on the
advertisement's LS type.
The time since the link state advertisement was first
originated, in seconds.
The sequence number field is a signed 32-bit integer.
It is used to detect old and duplicate link state
advertisements. The larger the sequence number,
the more recent the advertisement.
The checksum is used to detect data corruption of an
advertisement. This corruption can occur while an
advertisement is being flooded, or while it is being
held in a router's memory. This field is the checksum
of the complete contents of the advertisement,
except the LS age field.
The Options field in the link state advertisement
header indicates which optional capabilities are
associated with the advertisement. The options are:
•
Q: This enables support for QoS Traffic
Engineering.
•
E: This describes the way AS-external-LSAs are
flooded.
•
MC: This describes the way IP multicast
datagrams are forwarded according to the
standard specifications.
•
O: This describes whether Opaque-LSAs are
supported.
•
V: This describes whether OSPF++ extensions
for VPN/COS are supported.