Cisco WS-C3548-XL-EN - Catalyst 3548XL Enterprise Edition Switch Manual de usuario descargar pdf (Pagina 2)

Ethernet Uplinks, a redundant GigaStack loopback cable, Uplink

Fast for high-speed uplink failover, and per VLAN Spanning Tree

(PVST+) for uplink load balancing. This Gigabit Ethernet

ﬂexibility makes the Catalyst 3500 series XL an ideal LAN edge

complement to the Cisco Catalyst 6500 family of Gigabit

Ethernet optimized core LAN switches.

Cisco Switch Clustering

Breakthrough Cisco Switch Clustering technology enables up to

16 interconnected Catalyst 3500 XL, Catalyst 2900 XL, and

Catalyst 1900 switches, regardless of geographic proximity, to

form a single IP management domain. Cisco Switch Clustering

supports a broad range of standards-based connectivity options

and conﬁgurations to deliver levels of performance that are

scalable to meet customer requirements. Switch Cluster

connectivity options for the Catalyst 3500 series XL include

Ethernet, Fast Ethernet, Fast EtherChannel, low-cost Cisco

GigaStack GBIC, Gigabit Ethernet, and Gigabit EtherChannel

connectivity. Because the technology is not limited by proprietary

stacking modules or stacking cables, Cisco Switch Clustering

expands the traditional stacking domain beyond a single wiring

closet and lets users mix and match interconnections to meet

speciﬁc management, performance, and cost requirements.

Catalyst 3500 XL switches can be conﬁgured either as command

or member switches in a Cisco switch stack or cluster. The

command switch serves as the single IP address management

point and disburses all management instructions dictated by the

network administrator. Command switches can cluster up to 15

additional interconnected member switches regardless of

interconnection media.

Quality of Service

All Catalyst 3500 series XL switches support LAN edge quality

of service (QoS) based on IEEE 802.1p class of service (CoS),

as well as port-based prioritization. CoS is used for tagged

packets while port-based prioritization is used for untagged

packets. Priority scheduling is applied between the queues,

which will assure that the high priority queue is always serviced

before scheduling the low priority traffic. These features enable

users to prioritize mission critical traffic, such as VoIP and ERP

applications over regular traffic (such as FTP or generic Web

traffic).

Figure 2 Customers can start with a low-cost GigaStack GBIC-based 1-Gbps independent stack backplane. At any point, users have the option to increase their stack

performance to 5-Gbps using the same GigaStack GBICs in combination with the high-performance Catalyst 3508G XL Gigabit Ethernet aggregation switch.

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