Руководство По Проектированию для Cisco Cisco Nexus 5010 Switch
Design Guide
Figure 1.
Legacy Data Center Architecture
As Figure 1 indicates, the legacy design is a V-shape topology with access and aggregation layers, and with well-
known placement of root and secondary root switches, well-known placement of Hot Standby Router Protocol
(HSRP) primary and secondary devices, forwarding and blocking links from the access layer to the aggregation layer,
and various hardening features in place to guarantee deterministic spanning-tree behavior upon link failures.
known placement of root and secondary root switches, well-known placement of Hot Standby Router Protocol
(HSRP) primary and secondary devices, forwarding and blocking links from the access layer to the aggregation layer,
and various hardening features in place to guarantee deterministic spanning-tree behavior upon link failures.
Next-Generation Data Centers
Today’s data centers are mostly driven by the following needs:
●
The need for a higher level of reliability, with minimized downtime for updates and configuration changes:
Once a consolidated architecture is built, it’s critical to keep it up and running with minimum disruption.
Once a consolidated architecture is built, it’s critical to keep it up and running with minimum disruption.
●
The need to optimize the use of the data center network infrastructure by moving towards a topology where no
link is kept idle, whereas legacy topologies based on Spanning Tree Protocol are known to be inefficient
because of Spanning Tree Protocol blocking links or because of active/standby network interface card (NIC)
teaming. This need is addressed by Layer 2 multipathing technologies such as Virtual PortChannels (vPCs).
link is kept idle, whereas legacy topologies based on Spanning Tree Protocol are known to be inefficient
because of Spanning Tree Protocol blocking links or because of active/standby network interface card (NIC)
teaming. This need is addressed by Layer 2 multipathing technologies such as Virtual PortChannels (vPCs).
●
The need to optimize computing resources by reducing the rate of growth of physical computing nodes. This
need is addressed by server virtualization.
need is addressed by server virtualization.
●
The need to reduce the time that it takes to provision new servers. This need is addressed by the ability to
configure server profiles, which can be easily applied to hardware.
configure server profiles, which can be easily applied to hardware.
●
The need to reduce overall power consumption in the data center. This need can be addressed with various
technologies, including unified fabric (which reduce the number of adapters on a given server), server
virtualization, and more power-efficient hardware.
technologies, including unified fabric (which reduce the number of adapters on a given server), server
virtualization, and more power-efficient hardware.
●
The need to increase computing power at a lower cost: More and higher-performance computing clouds are
being built to provide a competitive edge to various enterprises.
being built to provide a competitive edge to various enterprises.
The data center design drivers just listed call for capabilities such as:
●
Architectures capable of supporting a SAN and a LAN on the same network (for power use reduction and
server consolidation).
server consolidation).
© 2010 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
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