Cisco 2950SX 24 - Catalyst Switch - Stackable Instrukcja Użytkownika Pobierz pdf (Strona 2)

2 Cisco Product Catalog, April, 2003

Key Features and Beneﬁts

Table 21-54: Catalyst 2950 Switches with SI Software — Features and Beneﬁts

Feature Benefit

Availability

Superior Redundancy for Fault Backup IEEE 802.1D Spanning-Tree Protocol support for redundant backbone connections and loop-free networks

simpliﬁes network conﬁguration and improves fault tolerance.

Support for Cisco Spanning-Tree Protocol enhancements such as UplinkFast, BackboneFast, and PortFast

technologies ensure quick fail-over recovery enhancing overall network stability and availability.

Support for Cisco’s optional, 300-watt redundant AC power system provides a backup power source for up to

four units for improved fault tolerance and network uptime.

Provides unidirectional link detection (UDLD) and Aggressive UDLD for detecting and disabling

unidirectional links on ﬁber-optic interfaces caused by incorrect ﬁber-optic wiring or port faults.

Integrated Cisco IOS Features for

Bandwidth Optimization

Bandwidth aggregation through EtherChannel technology enhances fault tolerance and offers higher-speed

aggregated bandwidth between switches, to routers and individual servers. Port Aggregation Protocol (PAgP)

is available to simplify conﬁguration.

Per-port broadcast, multicast, and unicast storm control prevents faulty end stations from degrading overall

systems performance.

Per virtual LAN (VLAN) Spanning-Tree Plus (PVST+) allows for Layer 2 load sharing on redundant links to

efﬁciently utilize the extra capacity inherent in a redundant design.

VLAN Trunking Protocol (VTP) pruning limits bandwidth consumption on VTP trunks by ﬂooding broadcast

trafﬁc only on trunk links required to reach the destination devices. Dynamic Trunking Protocol (DTP) enables

dynamic trunk conﬁguration across all ports in the switch.

IGMP snooping provides for fast client joins and leaves of multicast streams and limits bandwidth-intensive

video trafﬁc to only the requestors. MVR, IGMP ﬁltering and fast-join and immediate leave are available as

enhancements.

Security

Network-Wide Security Features A private VLAN edge provides security and isolation between ports on a switch, ensuring that voice trafﬁc

travels directly from its entry point to the aggregation device through a virtual path and cannot be directed to a

different port.

Support for the 802.1x standard allows users to be authenticated regardless of which LAN port they are

accessing, and provides unique beneﬁts to customers who have a large base of mobile (wireless) users

accessing the network.

• 802.1x with voice VLAN to permit an IP phone access to the voice VLAN irrespective of the authorized or

unauthorized state of the port.

• 802.1x with port security for authenticating the port and managing network access for all MAC addresses,

including that of the client.

Port Security secures the access to a port based on the MAC address of a user’s device. The aging feature

removes the MAC address from the switch after a speciﬁc timeframe to allow another device to connect to the

same port.

MAC Address Notiﬁcation allows administrators to be notiﬁed of new users added or removed from the

network.

Multilevel security on console access prevents unauthorized users from altering the switch conﬁguration.

Trusted Boundary provides the ability to trust the QoS priority settings if an IP phone is present and disable the

trust setting in the event that the IP phone is removed, thereby preventing a rogue user from overriding

prioritization policies in the network.

TACACS+ and RADIUS authentication to enable centralized control of the switch and restrict unauthorized

users from altering the conﬁguration.

SNMPv3 (non-crypto) monitors and controls network devices, manages conﬁgurations, statistics collection,

performance, and security

Cisco CMS Software Security Wizards ease the deployment of security features for restricting user access to a

server, a portion of the network, or access to the network.

QoS

Layer 2 QoS Support for reclassifying frames based either on 802.1p CoS value or default CoS value per port assigned by

network manager.

Four queues per egress port supported in hardware.

The WRR scheduling algorithm ensures that low-priority queues are not starved.

Strict priority queue conﬁguration via Strict Priority Scheduling ensures that time-sensitive applications such

as voice always follow an expedited path through the switch fabric.

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