Cisco 2950SX 24 - Catalyst Switch - Stackable Bedienungsanleitung PDF herunterladen (Seite 7)

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Service Breadth

Advanced QoS

(continued)

QoS Scheduling Support at Egress

• Four queues per egress port are supported in hardware.

• The WRR queuing algorithm ensures that low-priority queues are not

starved.

• Strict-priority queue conﬁguration ensures that time-sensitive applications

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

Granular rate limiting • The switch supports up to 6 policers per Fast Ethernet port and up to 60

policers on a Gigabit Ethernet port.

• The switch offers granularity of trafﬁc ﬂows at 1Mbps on Fast Ethernet ports

and 8 Mbps on Gigabit Ethernet ports.

• The switch offers the ability to limit data ﬂows based on MAC source/

destination address, IP source/destination address, TCP/UDP port numbers,

or any combination of these ﬁelds.

• The switch offers the ability to manage data ﬂows asynchronously upstream

and downstream from the end station or on the uplink.

Voice and video services • 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

port number to the GDA list for that group. And, when the switch hears an

IGMP leave request, it removes the host port from the list.

• Multicast VLAN registration (MVR) continuously sends multicast streams in

a multicast VLAN while isolating the streams from subscriber VLANs for

bandwidth and security reasons.

• IGMP ﬁltering provides the control of the set of multicast groups to which a

user on a switch port can belong.

• Voice VLAN (auxiliary VLAN) support for VoIP application allows the

creation

Resiliency and reliability • IEEE 802.1w Rapid Spanning Tree Protocol (RSTP) takes advantage of

point-to-point wiring and provides rapid convergence of the spanning tree

independent of spanning-tree timers. Reconﬁguration of the spanning tree

can occur in less than one second, a feature that is critical for networks

carrying delay-sensitive trafﬁc such as voice and video.

• IEEE 802.1s Multiple Spanning Tree (MSTP), which uses RSTP for rapid

convergence, enables VLANs to be grouped into a spanning-tree instance,

with each instance having a spanning-tree topology independent of other

spanning-tree instances. This architecture provides for multiple forwarding

paths for data trafﬁc, enables load balancing, and reduces the number of

spanning-tree instances required to support a large number of VLANs.

• Cisco UplinkFast/BackboneFast technologies ensure quick failover recovery,

enhancing overall network stability and reliability.

Feature Benefit

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