Information Technology Reference
In-Depth Information
Access
Layer
Distribution
Layer
Core
Layer
Distribution
Layer
Access
Layer
Dual-Stack Infrastructure
IPv4 and IPv6
Dual-Stack
Server
Dual-Stack
Client
ISATAP Tunnels
Manually Configured Tunnels
Service Block IPv4 and IPv6
Figure 9-16
Service Block Deployment Model
IPv6 Deployment Model Comparison
Ta ble 9 -1 0 summarizes the advantages and disadvantages of the IPv6 deployment models.
Ta b l e 9 -1 0
IPv6 Deployment Model Comparison
IPv6
Deployment
Model
Advantages
Disadvantages
Dual-stack
model
Tunneling not required.
Better processing performance.
IPv4 & IPv6 independent routing,
QoS, security, and multicast policies.
Network equipment upgrades.
Hybrid
model 1
Existing network can be leveraged
with no upgrades.
IPv6 multicast not supported within
ISATAP tunnels.
Te r m i n a t i n g I S ATA P t u n n e l s i n c o r e
makes the core appear to be in IPv6
access layer.
Hybrid
model 2
IPv4 and IPv6 have independent
routing, QoS, security, and multicast
policies.
Many static tunnels which makes it
difficult to manage.
Server block
model
Lesser impact on existing network.
Flexible when controlling access to
IPv6-enabled applications.
Large amounts of tunneling.
Cost of additional equipment.
Ta ble 9 -1 1
name. Study this table for the test.
