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Chapter 13
Configuring PortChannels
S e n d d o c u m e n t a t i o n c o m m e n t s t o m d s f e e d b a c k - d o c @ c i s c o . c o m .
Invalid Configuration Examples
Figure 13-7
1,2,3, 4 sequence, links 3 and 4 will be operationally down as the fabric is misconfigured.
Figure 13-7
Channel Group 10
Cisco MDS
Switch A
Channel Group 10
Cisco MDS
Switch A
PortChannel Protocol
In earlier Cisco SAN-OS releases, PortChannels required additional administrative tasks to support
synchronization. The Cisco SAN-OS software provides robust error detection and synchronization
capabilities. You can manually configure channel groups or they can be automatically created. In both
cases, the channel group have the same capability and configurational parameters. Any change in
configuration applied to the associated PortChannel interface is propagated to all members of the
channel group.
A protocol to exchange PortChannel configurations is available in all Cisco MDS switches. This addition
simplifies PortChannel management with incompatible ISLs. An additional autocreation mode enables
ISLs with compatible parameters to automatically form channel groups without manual intervention.
The PortChannel protocol is enabled by default.
OL-6973-03, Cisco MDS SAN-OS Release 2.x
provides examples of invalid configurations. Assuming that the links are brought up in the
Misconfigured Configurations
Channel Group 20
1
1
2
2
Cisco MDS
Switch B
3
3
X
4
4
X
Channel Group 20
1
1
Cisco MDS
Switch B
2
2
3
3
X
Cisco MDS
Switch C
4
4
X
Channel Group 10
1
2
Cisco MDS
Switch A
3
X
4
X
Cisco MDS 9000 Family Configuration Guide
PortChannel Protocol
Channel Group 20
1
2
Cisco MDS
Switch B
3
4
13-13
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