Design Reference
Table Of Contents
- Contents
- Chapter 1: Introduction
- Chapter 2: New in this release
- Chapter 3: Network design fundamentals
- Chapter 4: Hardware fundamentals and guidelines
- Chapter 5: Optical routing design
- Chapter 6: Platform redundancy
- Chapter 7: Link redundancy
- Chapter 8: Layer 2 loop prevention
- Chapter 9: Spanning tree
- Chapter 10: Layer 3 network design
- Chapter 11: SPBM design guidelines
- Chapter 12: IP multicast network design
- Multicast and VRF-lite
- Multicast and MultiLink Trunking considerations
- Multicast scalability design rules
- IP multicast address range restrictions
- Multicast MAC address mapping considerations
- Dynamic multicast configuration changes
- IGMPv3 backward compatibility
- IGMP Layer 2 Querier
- TTL in IP multicast packets
- Multicast MAC filtering
- Guidelines for multicast access policies
- Multicast for multimedia
- Chapter 13: System and network stability and security
- Chapter 14: QoS design guidelines
- Chapter 15: Layer 1, 2, and 3 design examples
- Chapter 16: Software scaling capabilities
- Chapter 17: Supported standards, RFCs, and MIBs
- Glossary
Figure 43: Traditional routing before moving VMs
A VM is a virtual server. When you move a VM, the virtual server is moved as is. This action
means that the IP addresses of that server remain the same after the server is moved from
one data center to the other. This in turn dictates that the same IP subnet (and hence VLAN)
exist in both data centers.
In the following figure, the VM moved from the data center on the left to the data center on the
right. To ensure a seamless transition that is transparent to the user, the VM retains its network
connections through the default gateway. This method works, but it adds more hops to all
traffic. As you can see in the figure, one VM move results in a complicated traffic path. Multiply
this with many moves and soon the network look like a tangled mess that is very inefficient,
difficult to maintain, and almost impossible to troubleshoot.
Data Center Routing — Traditional (post VM move):
Reference architectures
Network Design Reference for Avaya VSP 4000 February 2014 93