Cisco 2950 - Catalyst Switch Технічний паспорт - Сторінка 5

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The Catalyst 2950 LRE Series switches are capable of allocating bandwidth based on several criteria including MAC

source address, MAC destination address, IP source address, IP destination address, and TCP/UDP port number.

Bandwidth allocation is essential in network environments requiring service-level agreements or when it is necessary

for the network manager to control the bandwidth given to certain users. The Catalyst 2950 LRE Series switches

support up to 6 policers per LRE port and up to 60 policers on a Gigabit Ethernet port. This gives the network

administrator very granular control of LAN bandwidth.

Network Availability

To provide efﬁcient use of resources for bandwidth-hungry applications like multicasts, the Cisco Catalyst 2950 LRE

Series Intelligent switches support Internet Group Management Protocol (IGMP) snooping in hardware. Through the

support and conﬁguration of IGMP snooping via the Cisco CMS Software, Catalyst 2950 LRE Series switches deliver

outstanding performance and ease of use in administering and managing multicast applications on the LAN.

The IGMP snooping feature allows the switch to "listen in" on the IGMP conversation between hosts and routers.

When a switch hears an IGMP join request from a host for a given multicast group, the switch adds the host's port

number to the Group Destination Address (GDA) list for that group. And, when the switch hears an IGMP leave

request, it removes the host's port from the Content Addressable Memory (CAM) table entry.

PVST+ allows users to implement redundant uplinks while also distributing trafﬁc loads across multiple links. This is

not possible with standard Spanning-Tree Protocol implementations. Cisco UplinkFast technology ensures immediate

transfer to the secondary uplink, much better than the traditional 30 to 60 second convergence time. This is yet another

enhancement of the Spanning-Tree Protocol implementation. An additional feature that enhances performance is

Voice VLAN. This feature allows network administrators to assign voice trafﬁc to a VLAN dedicated to IP

telephony—simplifying phone installations and providing easier network trafﬁc administration and troubleshooting.

Multicast VLAN Registration (MVR) is designed for applications using wide-scale deployment of multicast trafﬁc

across an Ethernet ring-based service provider network (for example, the broadcast of multiple television channels

over a service-provider network). MVR allows a subscriber on a port to subscribe and unsubscribe to a multicast

stream on the network-wide multicast VLAN.

The Cisco Cluster Management Suite (CMS) is Web-based software that is embedded in Catalyst 3550, 2950, 2950

LRE, 3500 XL, 2900 XL, and 2900 LRE XL switches. Through Cisco Switch Clustering technology, users access

Cisco CMS with any standard Web browser to manage up to 16 of these switches at once, regardless of their

geographic proximity—with the option of using a single IP address for the entire cluster if desired. With the addition

of the Catalyst 3550 switches, Cisco CMS Software can now extend beyond routed boundaries for even more

ﬂexibility in managing a Cisco cluster.

Cisco CMS provides an integrated management interface for delivering intelligent services, such as multi-layer

switching, QoS, multicast and security access control lists (ACLs). Thus, CMS allows administrators to take

advantage of beneﬁts formerly reserved for only the most advance networks without having to learn the

command-line interface (CLI) or even the details of the technology.

The new Guide Mode in Cisco CMS leads the user step-by-step through the conﬁguration of advanced features and

provides enhanced online help for context-sensitive assistance. In addition, Cisco AVVID (Architecture for Voice,

Video, and Integrated Data) Wizards provide automated conﬁguration of the switch to optimally support video

Cisco Systems, Inc.

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