Cisco Cisco Catalyst Blade Switch 3030 for Dell 백서
Design Guide
fault tolerance may be achieved with Layer 3 technologies such as Hot Standby Router Protocol
(HSRP) or Virtual Router Redundancy Protocol (VRRP). These protocols allow the gateways for
servers or clients to be virtualized across the physical routing devices in the network. This
virtualization mitigates the effect of a routing device failure on the availability of data center
services. Load-balancing services deployed in the aggregation layer allow the network to monitor
server health and application availability. These devices and features combined produce a more
resilient application environment.
(HSRP) or Virtual Router Redundancy Protocol (VRRP). These protocols allow the gateways for
servers or clients to be virtualized across the physical routing devices in the network. This
virtualization mitigates the effect of a routing device failure on the availability of data center
services. Load-balancing services deployed in the aggregation layer allow the network to monitor
server health and application availability. These devices and features combined produce a more
resilient application environment.
Dual-homing a server in relation to separate access layer switches is another method to achieve a
higher level of availability in the data center. NIC teaming removes the possibility of a single NIC
failure isolating the server. It requires the server to have two separate NICs that support teaming
software. Typically, teaming software detects failures over an external network probe between
members of the team or by monitoring the local status of each NIC in the team. The combination of
dual-homed servers and a network load balancer provides an even greater level of availability for
the server and the applications it supports.
higher level of availability in the data center. NIC teaming removes the possibility of a single NIC
failure isolating the server. It requires the server to have two separate NICs that support teaming
software. Typically, teaming software detects failures over an external network probe between
members of the team or by monitoring the local status of each NIC in the team. The combination of
dual-homed servers and a network load balancer provides an even greater level of availability for
the server and the applications it supports.
Data centers are the repository of critical business applications that support the continual operation
of an enterprise. These applications must be accessible throughout the working day during peak
times, and some on a 24-hour basis. The infrastructure of the data center, network devices, and
servers must address these diverse requirements. The network infrastructure provides device and
link redundancy combined with a deterministic topology design to achieve application availability
requirements. Servers are typically configured with multiple NICs and dual-homed to the access
layer switches to provide backup connectivity to the business application.
of an enterprise. These applications must be accessible throughout the working day during peak
times, and some on a 24-hour basis. The infrastructure of the data center, network devices, and
servers must address these diverse requirements. The network infrastructure provides device and
link redundancy combined with a deterministic topology design to achieve application availability
requirements. Servers are typically configured with multiple NICs and dual-homed to the access
layer switches to provide backup connectivity to the business application.
High availability is an important design consideration in the data center. The Cisco Catalyst Blade
Switch 3130 has a number of features and characteristics that contribute to a reliable, highly
available network.
Switch 3130 has a number of features and characteristics that contribute to a reliable, highly
available network.
High Availability for the Blade Server Switching Infrastructure
High availability between the Cisco Catalyst Blade Switch 3130s in the blade server enclosure and
the aggregation layer switches requires link redundancy. Each Cisco Catalyst Blade Switch 3130
offers multiple ports for uplink connectivity to the external network, which allows for redundant
paths using links to each aggregation layer switch for more redundancy. However, this introduces
the possibility of Layer 2 loops; therefore, a mechanism is required to manage the physical
topology. The implementation of RSTP helps ensure a fast converging, predictable Layer 2 domain
between the aggregation layer and access switches (the Cisco Catalyst Blade Switch 3130s) when
redundant paths are present. For those customers who want to implement the Access layer
without Spanning Tree, the CBS3130 supports FlexLinks. FlexLinks associates a “back up”
interface with each forwarding interface. There, the customer can maintain a redundant topology
without the need for spanning tree.
the aggregation layer switches requires link redundancy. Each Cisco Catalyst Blade Switch 3130
offers multiple ports for uplink connectivity to the external network, which allows for redundant
paths using links to each aggregation layer switch for more redundancy. However, this introduces
the possibility of Layer 2 loops; therefore, a mechanism is required to manage the physical
topology. The implementation of RSTP helps ensure a fast converging, predictable Layer 2 domain
between the aggregation layer and access switches (the Cisco Catalyst Blade Switch 3130s) when
redundant paths are present. For those customers who want to implement the Access layer
without Spanning Tree, the CBS3130 supports FlexLinks. FlexLinks associates a “back up”
interface with each forwarding interface. There, the customer can maintain a redundant topology
without the need for spanning tree.
A recommended design is a triangle topology (as shown in Figure 5 earlier), which delivers a highly
available environment through redundant links and a spanning tree. It allows for multiple switch or
link failures without compromising the availability of the data center applications.
available environment through redundant links and a spanning tree. It allows for multiple switch or
link failures without compromising the availability of the data center applications.
The access layer uplink EtherChannels support the publicly available subnets in the data center
and traffic between servers. The server-to-server traffic that uses these uplinks is logically
segmented through VLANs and may use network services available in the aggregation layer. This
path provides intra-enclosure connectivity between the servers for VLANs defined locally on the
blade enclosure switches. Clustering applications that require Layer 2 communication may use this
and traffic between servers. The server-to-server traffic that uses these uplinks is logically
segmented through VLANs and may use network services available in the aggregation layer. This
path provides intra-enclosure connectivity between the servers for VLANs defined locally on the
blade enclosure switches. Clustering applications that require Layer 2 communication may use this
© 2008 Cisco Systems, Inc. All rights reserved. This document is Cisco Public Information.
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