Designing Servers to Support Management Processes
Servers supporting management processes should be robust and secure. They have been put in place to collect and process data that is required to maintain the integrity of the network. You should place the servers in physically secure locations where they can run without being interrupted. The operating systems must be secured, and remote access to the servers should be extremely limited. Remember that the management stations have access to all the routers in the network, so t..
OSPF optimizes the LSA flooding process on multiaccess data links by using the concept of a designated router (DR). Without the concept of a DR, each pair of routers that share a data link would become fully adjacent neighbors. Each pair of routers would directly exchange their LSDBs with each other as shown in Figure 10-1. On a LAN with only six routers, without a DR, 15 different pairs of routers would exist, and 15 different instances of full database flooding would occur...
By definition, network bandwidth is finite, and points of congestion do occur. Both real-time and non-real-time traffic types encounter this congestion. If packets cannot be dropped to resolve congestion, packet flows that cause congestion should not be allowed onto the network. This makes the case for the deployment of CAC toolsthese are, in essence, the congestion-avoidance mechanisms for real-time applications. After it is admitted, a real-time flow such as a voice call mu..
You can improve NTP reliability by configuring several redundant servers. The reliability is better still if the router uses different paths to reach these servers: Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#clock timezone EST -5 Router(config)#clock summer-time EDT recurring Router(config)#ntp server 172.25.1.1 Router(config)#ntp server 10.121.33.231 Router(config)#ntp peer 192.168.12.12 Router(config)#end R..
Implementing Custom Queuing on a router is a two-step procedure. First, you must define the traffic types that will populate your queues. And then you apply the queuing method to an interface: Router#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router(config)#access-list 103 permit ip any any precedence 5 Router(config)#access-list 104 permit ip any any precedence 4 Router(config)#access-list 105 permit ip any any precedence 3 Router(..
