Large Network Using Catalyst 3750-X And 3560-X Switches - Cisco Catalyst 3750-X Software Configuration Manual

Network Configuration Examples
Figure 1-8
Standalone
switches

Large Network Using Catalyst 3750-X and 3560-X Switches

Switches in the wiring closet have traditionally been only Layer 2 devices, but as network traffic profiles
evolve, switches in the wiring closet are increasingly employing multilayer services such as multicast
management and traffic classification.
Catalyst 3750-X switch stacks in the wiring closets and two backbone switches, such as the
Catalyst 6500 switches, to aggregate up to ten wiring closets.
network that uses only Catalyst 3560-X switches in the wiring closets and two backbone switches, such
as the Catalyst 6500 switches, to aggregate up to ten wiring closets.
In the wiring closet, each switch stack or switch has IGMP snooping enabled to efficiently forward
multimedia and multicast traffic. QoS ACLs that either drop or mark nonconforming traffic based on
bandwidth limits are also configured on each switch stack or switch. VLAN maps provide intra-VLAN
security and prevent unauthorized users from accessing critical pieces of the network. QoS features can
limit bandwidth on a per-port or per-user basis. The switch ports are configured as either trusted or
untrusted. You can configure a trusted port to trust the CoS value, the DSCP value, or the IP precedence.
If you configure the port as untrusted, you can use an ACL to mark the frame in accordance with the
network policy.
Each switch stack or switch provides inter-VLAN routing. They provide proxy ARP services to get IP
and MAC address mapping, thereby removing this task from the routers and decreasing this type of
traffic on the WAN links. These switch stacks or switches also have redundant uplink connections to the
backbone switches, with each uplink port configured as a trusted routed uplink to provide faster
convergence in case of an uplink failure.
The routers and backbone switches have HSRP enabled for load-balancing and redundant connectivity
to guarantee mission-critical traffic.
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
1-28
Catalyst 3560-X Switches in a Collapsed Backbone Configuration
Internet
Cisco 2600 or
3700 routers
IP IP
Cisco IP
Workstations
phones
running
Cisco SoftPhone
software
Figure 1-9
Aironet wireless
access points
shows a configuration for a network that uses only
Figure 1-10 shows a configuration for a
Chapter 1 Overview
Gigabit
servers
OL-21521-01