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Cisco EtherSwitch Service Modules Feature Guide
Network Configuration Examples
83
Cisco IOS Release 12.2(25)SEC
You can use the Cisco EtherSwitch service modules and switch stacks to create the following:
• Cost-effective wiring closet (Figure 8)—A cost-effective way to connect many users to the wiring
closet is to have a switch stack of up to nine Cisco EtherSwitch service modules. To preserve switch
connectivity if one EtherSwitch service module in the stack fails, connect the switches and enable
either cross-stack EtherChannel or cross-stack UplinkFast.
You can have redundant uplink connections, using small form-factor pluggable (SFP) modules in
the switch stack to a gigabit backbone switch, such as a Catalyst 4500 or Catalyst 3750-12S gigabit
switch. You can also create backup paths by using Fast Ethernet, Gigabit Ethernet, or EtherChannel
links. If one of the redundant connections fails, the other can serve as a backup path.
Figure 8 Cost-Effective Wiring Closet
High demand on network redundancy
and availability to provide always on
mission-critical applications
• Use switch stacks, where all stack members are eligible stack masters in case of
stack master failure. All stack members have synchronized copies of the saved and
running configuration files of the switch stack.
• Cross-stack EtherChannel for providing redundant links across the switch stack.
• Use Hot Standby Router Protocol (HSRP) for cluster command EtherSwitch
service module and router redundancy.
• Use VLAN trunks, cross-stack UplinkFast, and BackboneFast for traffic-load
balancing on the uplink ports so that the uplink port with a lower relative port cost
is selected to carry the VLAN traffic.
An evolving demand for IP telephony
• Use QoS to prioritize applications such as IP telephony during congestion and to
help control both delay and jitter within the network.
• Use internal interfaces that support at least two queues per port to prioritize voice
and data traffic as either high- or low-priority, based on 802.1p/Q. The
Cisco EtherSwitch service module supports at least four queues per port.
• Use voice VLAN IDs (VVIDs) to provide separate VLANs for voice traffic.
Table 6 Providing Network Services (continued)
Network Demands Suggested Design Methods
Catalyst 3750
Layer 2
StackWise
switch stack
Cisco integrated services
router with EtherSwitch
service module
Cisco integrated
services router
with EtherSwitch
service module
Gigabit
server
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