Dell PowerConnect M6220 - Manual (Page 487)

Configuring Routing 485
• LS ID — 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.
• Age — The time since the link state advertisement was first originated, in seconds.
•
Sequence — 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.
• Checksum — 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.
• Options — The Options field in the link state advertisement header indicates which optional
capabilities are associated with the advertisement. Possible values 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.
Virtual Link Configuration
Use the Virtual Link Configuration page to create or configure virtual interface information for a
specific area and neighbor. A valid OSPF area must be configured before this page can be displayed.
To display the page, click Routing > OSPF > Virtual Link Configuration in the tree view.