Cisco Nexus 5000 Series Switch Fabric Manager Software Configuration Guide, NX-OS 4.0 (OL-16598-01, June 2008)

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Nexus 5000 Series Switch Fabric Manager Software Configuration Guide
OL-16598-01
Chapter 14 Configuring SAN Port Channels
Port Channel Protocol
switches. Link A3-B3 can join the channel groups (and the port channels) if the respective ports have
compatible configurations. Link A4-B4 operates as an individual link, because it is not compatible with
the existing member ports in the channel group.
Figure 14-14 Autocreating Channel Groups
The channel group numbers are assigned dynamically (when the channel group is formed).
The channel group number may change across reboots for the same set of port channels depending on
the initialization order of the ports.
Table 14-2 identifies the differences between user-configured and auto-configured channel groups.
1
po10 po20
2
3
4
1
2
3
4
Switch A Switch B
Channel Group 10 Channel Group 20
187288
Table 14-2 Channel Group Configuration Differences
User-Configured Channel Group Autocreated Channel Group
Manually configured by the user. Created automatically when compatible links come
up between two compatible switches, if channel
group autocreation is enabled in all ports at both
ends.
Member ports cannot participate in autocreation
of channel groups. The autocreation feature
cannot be configured.
None of these ports are members of a
user-configured channel group.
You can form the SAN port channel with a subset
of the ports in the channel group. Incompatible
ports remain in a suspended or isolated state
depending on the On or Active mode
configuration.
All ports included in the channel group participate
in the SAN port channel. No member port becomes
isolated or suspended; instead, the member port is
removed from the channel group when the link is
found to be incompatible.
Any administrative configuration made to the
SAN port channel is applied to all ports in the
channel group, and you can save the configuration
for the port channel interface.
Any administrative configuration made to the SAN
port channel is applied to all ports in the channel
group, but the configurations are saved for the
member ports; no configuration is saved for the
port channel interface. You can explicitly convert
this channel group, if required.
You can remove any channel group and add
members to a channel group.
You cannot remove a channel group. You cannot
add members to the channel group or remove
members. The channel group is removed when no
member ports exist.