Cisco Catalyst 3750-X Software Configuration Manual page 992

Understanding Link-State Tracking
Figure 40-6
Distribution
switch 1
Switch A
Link-
state
group 2
Link-
state
group 1
The configuration in
For links to switches and other network devices
•
Link-state group 1 on switch A
•
Catalyst 3750-X and 3560-X Switch Software Configuration Guide
40-24
Typical Link-State Tracking Configuration
Link-state
group 1
Link-state
group 1
Port Port
Port
5 6
7
Port
8
Port Port Port Port
1 2 3 4
Server 1
Primary link
Secondary link
Figure 40-6
Server 1 and server 2 use switch A for primary links and switch B for secondary links.
–
Server 3 and server 4 use switch B for primary links and switch A for secondary links.
–
Switch A provides primary links to server 1 and server 2 through link-state group 1. Port 1 is
–
connected to server 1, and port 2 is connected to server 2. Port 1 and port 2 are the downstream
interfaces in link-state group 1.
Port 5 and port 6 are connected to distribution switch 1 through link-state group 1. Port 5 and
–
port 6 are the upstream interfaces in link-state group 1.
Chapter 40
Network
Layer 3 link
Server 2
ensures that the network traffic flow is balanced as follows:
Configuring EtherChannels and Link-State Tracking
Link-state
group 2
Port
Port
6
7
Port
8
Port Port
1 2
Server 3
Distribution
switch 2
Link-state
group 2
Port
5
Switch B
Port Port
3 4
Link-
state
group 1
Link-
state
group 2
Server 4
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