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Figure 2 Example Switch Cluster Deployment Configuration
Catalyst 3508G XL
Members
Command
Closet A
Catalyst 1900 and 2900 XL
Daisy-Chain with
Fast Ethernet Technology
Closet B
Catalyst 3500 XL
Cascade with
GigaStack GBICs
Closet C
Combination
Cascade and
Daisy-Chain
Single IP Managed Domain
Quality of Service
All Catalyst 3500 series XL switches support LAN edge quality of
service (QoS) based on 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 or
ERP applications over regular traffic (such as FTP or generic Web
traffic).
Management Features
Cisco Catalyst 3500 series XL switches include several
exceptional features to increase network performance,
manageability, and security. To boost performance, Fast
EtherChannel and Gigabit EtherChannel technology offer from
400-Mbps to 4-Gbps high-performance bandwidth between
Catalyst switches, routers, and servers. The Cisco Group
Management Protocol (CGMP) enhances performance of
multimedia applications and reduces network traffic by allowing a
switch to selectively and dynamically forward IP multicast traffic
to targeted end stations.
Users can also implement higher levels of data security and
boost LAN performance by deploying up to 250 virtual LANs
(VLANs) per switch. This ensures that data packets are forwarded
only to stations within a specific VLAN, creating a virtual firewall
between groups of ports on the network. VLAN trunks can be
created from any port using either 802.1Q trunking or the Cisco
Inter-Switch Link (ISL) VLAN architecture. VLANs using
standards-based 802.1Q and ISL trunking providebroadcastcontrol
and enhanced security, and simplify adds, moves, and changes. Per
VLAN Spanning Tree (PVST+) allows users to implement
redundant uplinks while distributing traffic loads across multiple
links—which is not possible with standard STP implementations.
Cisco Uplink Fast technology ensures immediate transfer to the
secondary uplink, enhancing overall network stability and
reliability.
With the Catalyst 3500 series XL, network managers
can implement high levels of port and console security. Media access
control (MAC) address-based port level security prevents
unauthorized stations from accessing the switch. Multilevel access
security on the switch console prevents unauthorized users
from accessing or altering switch configuration. Terminal Access
Controller Access Control System (TACACS+) authentication
enables centralized access control of the switch and restricts
unauthorized users from altering the configuration.
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