Configuring OSPF and OSPFv3 1195
LS Age: 49
LS options: (E-Bit)
LS Type: Network Summary LSA
LS Id: 172.21.0.0 (network prefix)
Advertising Router: 10.10.10.10
LS Seq Number: 0x80000003
Checksum: 0x78f8
Length: 28
Network Mask: 255.255.0.0
Metric: 0
The cost can be set to the maximum value, 16,777,215, which is LSInfinity.
Since OSPF cannot send a type 3 summary LSA with this metric (according
to RFC 2328), the summary LSA is flushed. The individual routes are not re-
advertised.
Configuring Flood Blocking
Figure 35-40 shows an example topology for flood blocking. The
configuration follows.
Figure 35-40. Flood Blocking Topology
1
Configure R0:
terminal length 0
config
hostname R0
line console
R3
R0
VLAN 103
R1 R2
VLAN 104
VLAN 101 VLAN 102
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