Cisco Systems 2940 Bandwidth Availability, Quality of Service/Control Advanced Quality of Service

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Table 1 Product Features and Benefits

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Feature	Benefit
Availability/Scalability
Superior Redundancy for Fault Backup
• IEEE 802.1D Spanning Tree Protocol	• Ensures loop-free networks simplifies network configuration and
	improves fault tolerance.
• PortFast	• Transitions a port directly to forwarding state after linkup, allowing
	users to connect to the network in 2–3 seconds, rather than waiting
	~50 seconds for spanning tree to resolve.
• UniDirectional Link Detection (UDLD)	• Unidirectional links automatically detected and disabled to avoid
and Aggressive UDLD	problems such as spanning tree loops; Aggressive Mode
	automatically retries the link periodically to see if it has returned to
	bidirectional.
• Switchport Autorecovery	• Automatically attempts to re-enable a link that is disabled due to a
	network error (also known as “errdisable recovery”).
• BPDU Guard	• Shuts down Spanning-Tree Protocol PortFast-enabled interfaces
	when Bridge Protocol Data Units (BPDUs) are received to avoid
	accidental topology loops.
• Spanning Tree Root Guard (STRG)	• Prevents edge devices not in the network administrator’s control
	from becoming Spanning Tree Protocol root nodes.
• UplinkFast/BackboneFast	• Ensure quick fail-over recovery enhancing overall network stability
	and reliability.
Bandwidth Availability
• Per-port broadcast, multicast, and unicast	• Prevents faulty end stations from degrading overall systems
storm control	performance.
• Per VLAN Spanning Tree Plus (PVST+)	• Allows for Layer 2 load sharing on redundant links to utilize the full
	capacity of a redundant design.
• VLAN Trunking Protocol (VTP) pruning	• Limits bandwidth consumption on VTP trunks by limiting broadcast
	traffic only to trunk links required to reach the destination devices.
• Internet Group Management Protocol	• Provides bandwidth-intensive multicast traffic to only the
(IGMP) Snooping	requestors, rather than flooding all ports. Support for IGMP version
	1 and 2.
• IGMP immediate-leave processing	• Faster than normal multicast leave processing, this prunes out
	unnecessary multicast traffic immediately after a leave request.
• Multicast VLAN Registration (MVR)	• Allows multicast streams in a single networkwide multicast VLAN
	while subscribers remain in separate VLANs for bandwidth and
	security reasons.
Quality of Service/Control
Advanced Quality of Service
• Honor 802.1p class of service (CoS)	• Ability to prioritize traffic and put it in different queues.
• Mark/override 802.1P CoS per port	• Network administrator can enforce QoS policies, and prevent users
	from abusing QoS settings.
• 4 egress queues per port	• Enables network traffic to be put into 4 different queues, depending
	on the CoS priority.
• Weighted Round Robin (WRR)	• High priority queues can be allocated more time to send traffic.
scheduling	However, WRR also ensures lower priority queues are not
	neglected.
• Strict Priority scheduling	• Guarantees that the highest-priority packets are serviced ahead of
	all other traffic. Particularly useful for time-sensitive applications like
	voice over IP.

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