Page 149 - Handout Computer Network.

Computer Network 2026

Figure 6 - 20 shown a Link - State SPF Concerns

6.7.3 Hybrid Routing Protocol Features

A third type of routing protocol, balanced hybrid routing, combines aspects of both
distance vector and link-state routing protocols.
Balanced hybrid routing protocols use distance vectors with more accurate metrics to
determine the best paths to destination networks. However, they differ from most distance
vector protocols by using topology changes to trigger routing database updates instead of
periodic updates. Like link-state protocols, the balanced hybrid routing protocol converges
rapidly. However, it differs from distance vector and link-state protocols by using less bandwidth,
memory, and processor overhead.

Examples of hybrid protocols are Intermediate System-to-Intermediate System (IS-IS)
and Enhanced Interior Gateway Routing Protocol (EIGRP).

6.7.4 Distance Vector Routing Protocols

Routing table updates occur periodically when the topology in a distance vector protocol
network change. It is important for a routing protocol to be efficient in updating the routing
tables. As with the network discovery process, topology change updates proceed systematically
from router to router.

Distance vector algorithms instruct each router to send its entire routing table to each
of its adjacent neighbors. The routing tables include information about the total path cost, as
defined by the metrics, and the logical address of the advertising router on the path to each
network, as shown in Figure 6-15.

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