Configuring the ECN330-switch
4371553-KDU 137 365 Uen D 2006-06-16
Figure 192 Configuring OSPF
Command Usage
• OSPF looks at more than just the simple hop count. When adding the
shortest path to any node into the tree, the optimal path is chosen on
the basis of delay, throughput and connectivity. OSPF utilizes IP
multicast to reduce the amount of routing traffic required when sending
or receiving routing path updates. The separate routing area scheme
used by OSPF further reduces the amount of routing traffic, and thus
inherently provides another level of routing protection. In addition, all
routing protocol exchanges can be authenticated. Finally, the OSPF
algorithms have been tailored for efficient operation in TCP/IP Internets.
backbone
normal
area
NSSA
isolated
area
stub
Autonomous System A
Autonomous System B
external network
Router
ABR
ABR
ABR
ABR
ASBR
ASBR
ASBR
virtual
link
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