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Design Concepts for Using the Switch
Table 1-2
Providing Network Services
Network Demands
Efficient bandwidth usage for
multimedia applications and
guaranteed bandwidth for critical
applications
High demand on network redundancy
and availability to provide always on
mission-critical applications
An evolving demand for IP telephony
You can use the switches to create the following:
•
Cisco Catalyst Blade Switch 3020 for HP Software Configuration Guide
1-14
Suggested Design Methods
Use IGMP snooping to efficiently forward multimedia and multicast traffic.
•
Use other QoS mechanisms such as packet classification, marking, scheduling,
•
and congestion avoidance to classify traffic with the appropriate priority level,
thereby providing maximum flexibility and support for mission-critical, unicast,
and multicast and multimedia applications.
•
Use MVR to continuously send multicast streams in a multicast VLAN but to
isolate the streams from subscriber VLANs for bandwidth and security reasons.
Use Hot Standby Router Protocol (HSRP) for cluster command switch and router
•
redundancy.
Use VLAN trunks and BackboneFast for traffic-load balancing on the uplink ports
•
so that the uplink port with a lower relative port cost is selected to carry the VLAN
traffic.
Use QoS to prioritize applications such as IP telephony during congestion and to
•
help control both delay and jitter within the network.
•
Use switches that support at least two queues per port to prioritize voice and data
traffic as either high- or low-priority, based on IEEE 802.1p/Q. The switch
supports at least four queues per port.
•
Use voice VLAN IDs (VVIDs) to provide separate VLANs for voice traffic.
Cost-effective Gigabit-to-the-blade server for high-performance workgroups
high-speed access to network resources, you can use the Cisco Catalyst Blade Switch 3020 for HP
in the access layer to provide Gigabit Ethernet to the blade servers. To prevent congestion, use QoS
DSCP marking priorities on these switches. For high-speed IP forwarding at the distribution layer,
connect the switches in the access layer to a Gigabit multilayer switch with routing capability, such
as a Catalyst 3750 switch, or to a router.
The first illustration is of an isolated high-performance workgroup, where the blade switches are
connected to Catalyst 3750 switches in the distribution layer.
Each blade switch in this configuration provides users with a dedicated 1-Gb/s connection to
network resources. Using SFP modules also provides flexibility in media and distance options
through fiber-optic connections.
Chapter 1
Overview
(Figure
1-1)—For
OL-8915-03
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Troubleshooting
