Cisco CATALYST 3560-E Specifications download pdf (Page 5)

Data Sheet

Implementing routed uplinks to the core improves network availability by enabling faster failover

protection and simplifying the Spanning Tree Protocol algorithm by terminating all Spanning Tree

Protocol instances at the aggregator switch. If one of the uplinks fails, quicker failover to the

redundant uplink can be achieved with a scalable routing protocol such as Open Shortest Path

First (OSPF) or Enhanced Interior Gateway Routing Protocol (EIGRP) rather than relying on

standard Spanning Tree Protocol convergence. Redirection of a packet after a link failure using a

routing protocol results in faster failover than a solution that uses Layer 2 spanning-tree

enhancements. Additionally, routed uplinks allow better bandwidth use by implementing equal cost

routing (ECR) on the uplinks to perform load balancing. Routed uplinks optimize the utility of

uplinks out of the LAN Access by eliminating unnecessary broadcast data flows into the network

backbone.

The Cisco Catalyst 3560 also offers dramatic bandwidth savings as a wiring-closet switch in a

multicast environment. Using routed uplinks to the network core eliminates the requirement to

transmit multiple streams of the same multicast from the upstream content servers to LAN access

switches. For example, if three users are assigned to three separate VLANs and they all want to

view multicast ABC, then three streams of multicast ABC must be transmitted from the upstream

router to the wiring-closet switch-assuming the wiring-closet switch is not capable of routed

uplinks. Deploying IP routing to the core with Cisco Catalyst 3560 switches allows users to create

a scalable, multicast-rich network. The Cisco Advanced IP Services license offers IPv6 routing and

IPv6 ACL support, including support for dual IP stack (Simultaneous IPv4 and IPv6) forwarding.

IPv6 protocol support includes RIP next generation (RIPng), OSPFv3, and static routes. IPv6

management and MLD Snooping are supported on all three Cisco Catalyst 3560 software images.

Enhancements to the standard Spanning Tree Protocol, such as Per-VLAN Spanning Tree Plus

(PVST+), Uplink Fast, and PortFast, maximize network uptime. PVST+ allows for Layer 2 load

sharing on redundant links to efficiently use the extra capacity inherent in a redundant design.

Uplink Fast, PortFast, and BackboneFast all greatly reduce the standard 30- to 60-second

Spanning Tree Protocol convergence time. Loop guard and bridge-protocol-data-unit (BPDU)

guard provide Spanning Tree Protocol loop avoidance.

Advanced QoS

The Cisco Catalyst 3560 offers superior multilayer, granular QoS features to help ensure that

network traffic is classified and prioritized, and that congestion is avoided in the best possible

manner. Configuration of QoS is greatly simplified through automatic QoS (Auto QoS), a feature

that detects Cisco IP phones and automatically configures the switch for the appropriate

classification and egress queuing. This optimizes traffic prioritization and network availability

without the challenge of a complex configuration.

The Cisco Catalyst 3560 can classify, reclassify, police, mark, queue, and schedule incoming

packets, and can queue and schedule packets at egress. Packet classification allows the network

elements to discriminate between various traffic flows and enforce policies based on Layer 2 and

Layer 3 QoS fields.

1 2 3 4 5 6 7 8 9 10 ... 20 21

No comments

Cisco CATALYST 3560-E Specifications Page 5