Understand Open Shortest Path First (ospf) Design Guide

Link connected to: a Transit Network
(Link ID) Designated Router address: 203.0.113.68
(Link Data) Router Interface address: 203.0.113.67
Number of TOS metrics: 0
TOS 0 Metrics: 10
Note that the Link ID is equal to the IP address (not the RID) of the attached DR; in this case it is
203.0.113.68. The Link Data is the RTC IP address.
Network Links
Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
203.0.113.68 203.0.113.41 334 0x80000001 0xB6B5
One network link is listed, indicated by the interface IP address (not the RID) of the DR, in this
case 203.0.113.68. A detailed view of this entry:
RTC#show ip ospf database network
OSPF Router with ID (203.0.113.67) (Process ID 10)
Net Link States (Area 0)
Routing Bit Set on this LSA
LS age: 1549
Options: (No TOS-capability)
LS Type: Network Links
Link State ID: 203.0.113.68 (address of Designated Router)
Advertising Router: 203.0.113.41
LS Seq Number: 80000002
Checksum: 0xB4B6
Length: 32
Network Mask: 255.255.255.192
Attached Router: 203.0.113.41
Attached Router: 203.0.113.67
Note that the network link lists the RIDs of the routers attached to the transit network; in this case
the RIDs of RTA and RTC are listed.
Summary Links
Summary Net Link States (Area 0)
Link ID ADV Router Age Seq# Checksum
203.0.113.150 203.0.113.67 792 0x80000002 0xAEBD
Area 0 has one summary link represented by the IP network address of the
link 203.0.113.150. This link was injected by the ABR RTC from area 1 into
area 0. A detailed view of this summary link, summary links for
area 1 are not listed here:
RTC#show ip ospf database summary (area 1 is not listed)
Summary Net Link States (Area 0)
LS age: 615

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Options: (No TOS-capability)
LS Type: Summary Links(Network)