Selecting The Best Route - 3Com 4007 Implementation Manual

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Routing table

Selecting the Best

The routing table consists of the following elements:

Interface — The interface number of the router that is used to reach

a network segment

Address — The network segments that the router knows about

Hops to network — The number of routers that must be crossed to

reach a network segment

Ticks to network — An estimate of the time that it takes to reach a

network segment. There are 18.21 ticks in a second.

Node — The node address of the router that can forward packets to

each network segment. When the node is set to all 0s, the router is

directly connected.

Age — The time since the network's last update

Figure 61 shows an example of a typical routing information table.

Figure 61 Sample Routing Table

The routing information table is updated statically or dynamically.

Large networks contain many possible routes to each destination. A

router performs the following steps to find the best route toward a

destination:

If one route requires the lowest number of ticks, the router selects it as

the best route.

If multiple routes require the same lowest number of ticks, the router

selects the route that requires the lowest number of hops as the

If multiple routes require the same lowest number of ticks and hops,

the router may select any of them as the best route.

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