User manual

xStack DGS/DXS-3300 Series Layer 3 Stackable Gigabit Ethernet Switch User Manual
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Network Links Advertisements
Network links advertisements are Type 2 link state advertisements. A network links advertisement is originated for each
transit network in the area. A transit network is a multi-access network that has more than one attached router. The network
links advertisement is originated by the network’s Designated router. The advertisement describes all routers attached to
the network, including the Designated Router itself. The advertisement’s Link State ID field lists the IP interface address of
the Designated Router.
The distance from the network to all attached routers is zero, for all TOS. This is why the TOS and metric fields need not
be specified in the network links advertisement.
The format of the Network Links Advertisement is shown below:
Link-State Age
Options
Link-State ID
Advertising Router
Link-State Sequence Number
Link-State Checksum
Length
Network Link Advertisements
2
Network Mask
Attached Router
Figure 6- 137. Network Link Advertisements
Field Description
Network Mask The IP address mask for the network.
Attached Router The Router IDs of each of the routers attached to the network. Only
those routers that are fully adjacent to the Designated Router (DR)
are listed. The DR includes itself in this list.