Nexus 7000 Ethernet 1/7: Config not allowed, as first port in the port-grp is dedicated Error Message

Introduction

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.

Prerequisites

Requirements

Cisco recommends that you have knowledge of the Cisco Nexus CLI.

Components Used

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.

Problem

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

Solution

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:

1. Gather the output from these commands:
   • show version
   • show module
   • show running-config
2. Review the show module in order to ensure that the configuration is attempted on an N7K-M132XP-12 port.
3. 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

4.  Verify that the ports in the second column are in dedicated mode:

   interface Ethernet1/1 <<<<<<<
     switchport
     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
     no shutdown

   If the ports are in dedicated mode, you see the error message mentioned.
5. Change the rate-mode to shared in order to fix the problem.

Caution: This is a disruptive change.

Related Information

• Nexus 7000 M132 Linecard Datasheet - Cisco
• Technical Support & Documentation - Cisco Systems