IPv6 for Enterprise Networks

Planning Address Allocation (IPv6)

The Internet Assigned Numbers Authority (IANA) oversees global IP address allocation. IANA delegates allocations of IP address blocks to Regional Internet Registries (RIR). Each RIR represents a geographical area. Some examples of RIRs are as follows: ■ ARIN: American IPv6 Registration Services (http://www.arin.net) ■ APNIC: Asia Pacific Network Information Center http://www.apnic.net) ■ RIPE: European Regional […]

Campus Deployment Models Overview (IPv6)

This topic covers the following subjects: ■ Campus deployment models overview: A description is given of the three campus IPv6 deployment models that are most commonly used in the enterprise ■ General campus IPv6 deployment considerations: Details are provided on generic IPv6 considerations that apply to any of the three campus IPv6 deployment models ■ […]

General Campus IPv6 Deployment Considerations Part 1

Many considerations apply to all the deployment models discussed in this topic. The following sections focus on the general ones that apply to deploying IPv6 in a campus network, regardless of the deployment model being used. If a particular consideration must be understood in the context of a specific model, this model is called out […]

General Campus IPv6 Deployment Considerations Part 2

IPv6 Traffic Policing Traffic policing can be considered a QoS and/or security function. There might be existing requirements to police traffic either on an aggregate or per-user microflow basis (that is, flows defined by a source/destination address pairing and/or source/destination port pairing). In the campus models discussed in this topic, certain places are appropriate for […]

Implementing the Dual-Stack Model (IPv6) Part 1

The following sections focus on the configuration of the DSM. The configurations are divided into specific areas, such as VLAN, routing, and HA configuration. Many of these configurations, such as VLANs and physical interfaces, are not specific to IPv6. VLAN configurations for the DSM are the same for IPv4 and IPv6, but are shown for […]

Implementing the Dual-Stack Model (IPv6) Part 2

First-Hop Redundancy Configuration The HA design in the DSM consists of running two of each switches (applicable in the distribution, core, and data center aggregation layers) and ensuring that the IPv4 and IPv6 routing configurations are tuned and completely fault-tolerant. All distribution pairs in the reference campus configuration are running HSRP for both IPv4 and […]

Implementing the Dual-Stack Model (IPv6) Part 3

Cisco Virtual Switching System with IPv6 This section gives descriptions and examples of using the Cisco Virtual Switching System (VSS) with IPv6 in the campus. Most enterprise networks deploy switches in pairs at the distribution and core layer to provide high availability in cases of chassis failure. The challenges of this design are that it […]

Implementing the Hybrid Model (IPv6) Part 1

The purpose of the HM is to provide campus users access to IPv6-based applications, even though parts of the campus might not have IPv6 support. Because of this lack of support, most of the campus network in the HM is IPv4-only. The IPv6 part of the campus network begins in the core layer. The following […]

Implementing the Hybrid Model (IPv6) Part 2

QoS Configuration The QoS policies for the HM should match the existing IPv4 policies. As previously mentioned, the HM model presents a challenge with respect to where the IPv6 packets are classified and marked. The IPv6 packets are encapsulated within ISATAP tunnels all the way from the host in the access layer to the core […]

Implementing the Service Block Model (IPv6)

The ISATAP deployment on the SBM is nearly identical to that of the HM. Both models deploy a redundant pair of switches used to provide fault-tolerant termination of ISATAP tunnels coming from the hosts in the access layer. The only difference between the SBM and HM is that the SBM is using a new set […]