Cisco Catalyst Series Switch 2940 Datasheet page 3

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