This document describes a problem encountered when a port configuration is attempted on a Cisco Nexus 7000 M1-Series 32-Port 10Gb Ethernet Module with a 12-linecard (N7K-M132XP-12), and also provides a solution to the problem.
Cisco recommends that you have knowledge of the Cisco Nexus CLI.
The information in this document is based on the N7K-M132XP-12 on any Nexus 7000 chassis.
The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, make sure that you understand the potential impact of any command.
When a port configuration is attempted on an N7K-M132XP-12, this error message is reported:
ERROR: Ethernet1/7: Config not allowed, as first port in the port-grp is dedicated
The N7K-M132XP-12 delivers eight ports at line rate or allows up to 32 ports to share 80 Gb/s of bandwidth. The 32 ports are organized into eight groups of four ports. In dedicated mode, the first port in each group is active and delivers the line-rate performance, and the other three ports are disabled. In shared mode, all four ports in the group are active.
Follow these steps in order to collect the appropriate data for verification and to fix the problem:
- Gather the output from these commands:
- show version
- show module
- show running-config
- Review the show module in order to ensure that the configuration is attempted on an N7K-M132XP-12 port.
- If the port is on the N7K-M132XP-12, then review this table:
|Port Groups that Can Share Bandwidth ||Ports that Can be Dedicated to Each 10Gb Ethernet of Bandwidth|
|1, 3, 5, 7 ||1|
|2, 4, 6, 8||2|
|9, 11, 13, 15 ||9|
|10, 12, 14, 16 ||10|
|17, 19, 21, 23 ||17|
|18, 20, 22, 24 ||18|
|25, 27, 29, 31 ||25|
|26, 28, 30, 32 ||26|
- Verify that the ports in the second column are in dedicated mode:
interface Ethernet1/1 <<<<<<<If the ports are in dedicated mode, you see the error message mentioned.
switchport mode trunk
switchport trunk native vlan 1
switchport trunk allowed vlan all
spanning-tree port type network
rate-mode dedicated force <<<<<<<
channel-group 1 mode active
- Change the rate-mode to shared in order to fix the problem.