Advanced Distance Vector Protocol Algorithm
The advanced distance vector protocol, or hybrid routing protocol, uses distance vectors with more
accurate metrics to determine the best paths to destination networks. However, it differs from most
distance vector protocols by using topology changes to trigger routing database updates, as
opposed to periodic updates.
This routing protocol converges more rapidly, like the link-state protocols. However, it differs
from link-state protocols by emphasizing economy in the use of required resources, such as
bandwidth, memory, and processor overhead.
An example of an advanced distance vector protocol is the Cisco Enhanced Interior Gateway
Routing Protocol (EIGRP).
Summary of Reviewing Routing Operations
The following list summarizes the key points discussed in this section:
?– Dynamic routing requires administrators to con?¬?gure either a distance vector or a link-state
routing protocol.
Implementing Variable-Length Subnet Masks 123
?– Distance vector routing protocols incorporate solutions such as split horizon, route poisoning,
and hold-down timers to prevent routing loops.
?– Link-state routing protocols scale to large network infrastructures better than distance vector
routing protocols, but they require more planning to implement.
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