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Chapter 5
Configuring Gigabit Ethernet Switching
Oversubscribed Gigabit Ethernet Example
Figure 5-1
multiple network servers and high-end workstations to the Gigabit Ethernet network backbone. These
configurations are shown:
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•
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Figure 5-1
78-12647-02
shows an example of how the 18-port server switching module (WS-X4418-GB) can connect
Server A, equipped with channel- and trunk-capable network interface cards (NICs), connects to the
switch through a four-port Gigabit EtherChannel trunk link. Two ports are in one oversubscribed
port group and two are in another. The switch can burst up to 2-Gbps bandwidth in each direction
while averaging 250 Mbps per connected port (1 Gbps total).
Servers B and C, also with channel- and trunk-capable NICs, share the oversubscribed port groups
used by Server A. Each server has one port in each oversubscribed port group and can burst up to
2 Gbps of traffic over channeled connections to and from the switch while maintaining an average
of 250 Mbps per connected port (500 Mbps total) in each direction.
Server D is the only device connected to the oversubscribed port group and can use the full 1-Gbps
bandwidth.
Workstations 1 through 4 are high-end workstations. Each connects to a port in one oversubscribed
port group. Each workstation can burst up to 1-Gbps bandwidth while averaging 250 Mbps in each
direction.
The network backbone connection is through a two-port Gigabit EtherChannel trunk link providing
2-Gbps bandwidth.
Example Server Switching Network Topology
Backbone
Network
switch
backbone
Gigabit
EtherChannel
bundles
Server
A
Software Configuration Guide—Catalyst 4000 Family, Catalyst 2948G, Catalyst 2980G, Releases 6.3 and 6.4
CAUTION
THIS ASSEMBLY
CONTAINS
ELECTROSTATI C-
SENSITIVE DEVICES
Server
Workstation 1
B
Server
C
Understanding How Gigabit Ethernet Works
0%
100%
Workstation 3
Workstation 4
Workstation 2
Server
D
5-5
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