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AOS-CX 8325 Port Speed Settings (following "Group speed mismatch" error)

Overview

The (newish) 8325 switch has SFP28 ports that support 1, 10, 25Gb connections. These are organised into interface groups of 12 ports each, and the default speed setting is 25Gb. You may not find the command to change it by looking around the CLI, hence this post.

 

Group speed mismatch Error

The flashing orange port light or this error is likely to be first indication you have that the port is not configured to support 1 or 10Gb transceivers.

 

8325 group speed mismatch.jpg

 

 

8325# sh int brief
----------------------------------------------------------------------------------
Port      Native  Mode   Type        Enabled Status  Reason                 Speed
          VLAN                                                              (Mb/s)
----------------------------------------------------------------------------------
1/1/1     --      routed --          no      down    No XCVR installed      --
1/1/2     --      routed --          no      down    No XCVR installed      --
1/1/3     --      routed SFP+DA3     no      down    Group speed mismatch   --
1/1/4     --      routed --          no      down    No XCVR installed      --
1/1/5     --      routed --          no      down    No XCVR installed      --
1/1/6     --      routed --          no      down    No XCVR installed      --
1/1/7     --      routed --          no      down    No XCVR installed      --
1/1/8     --      routed --          no      down    No XCVR installed      --
1/1/9     --      routed --          no      down    No XCVR installed      --
1/1/10    --      routed --          no      down    No XCVR installed      --
1/1/11    --      routed --          no      down    No XCVR installed      --
1/1/12    --      routed --          no      down    No XCVR installed      --
1/1/13    --      routed 1000BT      no      down    Group speed mismatch   --
1/1/14    --      routed --          no      down    No XCVR installed      --
1/1/15    --      routed --          no      down    No XCVR installed      --
1/1/16    --      routed --          no      down    No XCVR installed      --

In this example, there is a 10Gb DAC in 1/1/3, and a 1Gb RJ45 transceiver in 1/1/13 that are mismatched.

 

Standard commands do not show anything, and there are no pointers in the running config.

 

8325# sh int 1/1/3

Interface 1/1/3 is down (Administratively down)
 Admin state is down
 State information: Group speed mismatch
 Description:
 Hardware: Ethernet, MAC Address: 54:80:28:fc:86:00
 MTU 1500
 Type SFP+DA3
 qos trust none
 Speed 0 Mb/s
 Auto-Negotiation is on
 Flow-control: off
 Error-control: off
 Rx
             0 input packets               0 bytes
             0 input error                 0 dropped
             0 CRC/FCS
 Tx
             0 output packets              0 bytes
             0 input error                 0 dropped
             0 collision

8325# sh run int 1/1/3
[nothing at all in a default config]

Interface Group

We need to look specifically at the interface-group.

 

8325# sh system interface-group
------------------------------------------------
Group  Speed  Member Ports      Mismatched Ports
------------------------------------------------
1      25g    1/1/1-1/1/12      1/1/3
2      25g    1/1/13-1/1/24     1/1/13
3      25g    1/1/25-1/1/36
4      25g    1/1/37-1/1/48

 

8325 Interface groups.png

 

 

We need to change the config to 10g (which also supports 1Gb).

 

8325(config)# system interface-group 1 speed 10g
Changing the group speed will disable all member interfaces that
do not match the new speed.

Continue (y/n)? y
8325(config)# system interface-group 2 speed 10g
Changing the group speed will disable all member interfaces that
do not match the new speed.

Continue (y/n)? y
8325(config)# system interface-group 3 speed 10g
Changing the group speed will disable all member interfaces that
do not match the new speed.

Continue (y/n)? y
8325(config)# system interface-group 4 speed 10g
Changing the group speed will disable all member interfaces that
do not match the new speed.

Continue (y/n)? y

Working!

It now works OK.

 

8325(config)# sh int brief
----------------------------------------------------------------------------------
Port      Native  Mode   Type        Enabled Status  Reason                 Speed
          VLAN                                                              (Mb/s)
----------------------------------------------------------------------------------
1/1/1     --      routed --          no      down    No XCVR installed      --
1/1/2     --      routed --          no      down    No XCVR installed      --
1/1/3     --      routed SFP+DA3     no      down    Administratively down  --
1/1/4     --      routed --          no      down    No XCVR installed      --
1/1/5     --      routed --          no      down    No XCVR installed      --
1/1/6     --      routed --          no      down    No XCVR installed      --
1/1/7     --      routed --          no      down    No XCVR installed      --
1/1/8     --      routed --          no      down    No XCVR installed      --
1/1/9     --      routed --          no      down    No XCVR installed      --
1/1/10    --      routed --          no      down    No XCVR installed      --
1/1/11    --      routed --          no      down    No XCVR installed      --
1/1/12    --      routed --          no      down    No XCVR installed      --
1/1/13    --      routed 1000BT      no      down    Administratively down  --
1/1/14    --      routed --          no      down    No XCVR installed      --
1/1/15    --      routed --          no      down    No XCVR installed      --
1/1/16    --      routed --          no      down    No XCVR installed      --

 

And you can also see the commands in the config.

 

8325# sh run
Current configuration:
!
!Version ArubaOS-CX GL.10.03.0030
!
!
!
ssh server vrf mgmt
!
!
!
!
!
vlan 1
spanning-tree config-name 54:80:28:fc:86:00
interface mgmt
    no shutdown
    ip dhcp
! interface group 1 contains ports 1/1/1-1/1/12
system interface-group 1 speed 10g
! interface group 2 contains ports 1/1/13-1/1/24
system interface-group 2 speed 10g
! interface group 3 contains ports 1/1/25-1/1/36
system interface-group 3 speed 10g
! interface group 4 contains ports 1/1/37-1/1/48
system interface-group 4 speed 10g
interface 1/1/3
interface 1/1/55
   no shutdown

1Gb Optical Transceivers

There is an additional setting for 1Gb optical transceivers to force them to 1000-full. In fact this is the only parameter for "speed".

speed 1000-full

 



Richard Litchfield, HPE Aruba
Consulting System Engineer
Network Ambassador
MVP Expert

Re: AOS-CX 8325 Port Speed Settings (following "Group speed mismatch" error)

Greetings! great article!

 

Worth to add just a little note (IIRC): SFP Transceivers (Optical/Copper) are supported on Aruba 8325 starting from the ArubaOS-CX 10.03 CPE release (10.03.0001).

MVP Expert

Re: AOS-CX 8325 Port Speed Settings (following "Group speed mismatch" error)

Thans Richard !!!




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