Users may encounter a mixed-speed error and commit failure when adding a member link to the AE bundle from a different PIC on the same Flexible PIC Concentrator (FPC) or different FPC.

This article explains that the error could be due to incorrect values being configured for speed on the Physical Interface Card (PIC) of an FPC.

A mixed-speed error is encountered while adding a member link to the AE bundle from a different PIC on the same FPC or a different FPC.

In the following example, PIC 1 is configured for oc48-stm16 speed.

FPC 4            REV 06   750-063184   CAGJ5975          MPC2E NG PQ & Flex Q
  CPU            REV 13   711-045719   CAGD7850          RMPC PMB
  MIC 0          REV 31   750-028387   CAGB3200          3D 4x 10GE  XFP
    PIC 0                 BUILTIN      BUILTIN           2x 10GE  XFP
      Xcvr 0     REV 01   740-031833   UW11Q63           XFP-10G-LR
      Xcvr 1     REV 01   740-031833   UW11Q64           XFP-10G-LR
    PIC 1                 BUILTIN      BUILTIN           2x 10GE  XFP
      Xcvr 0     REV 01   740-031833   UW11PH5           XFP-10G-LR
      Xcvr 1     REV 01   740-031833   UW11GCV           XFP-10G-LR
  MIC 1          REV 05   750-060557   CAKS8425          MIC-3D-8OC3OC12-4OC48
    PIC 2                 BUILTIN      BUILTIN           MIC-3D-8OC3OC12-4OC48
      Xcvr 0     REV 01   740-016069   PYH21UN           SFP-IR
      Xcvr 1     REV 01   740-016069   PYH21V6           SFP-IR
      Xcvr 2     REV 01   740-016069   PYH21UA           SFP-IR
      Xcvr 3     REV 01   740-016069   PXS00E9           SFP-IR


set chassis fpc 4 pic 1 port 0 speed oc48-stm16
set chassis fpc 4 pic 1 port 1 speed oc48-stm16
set chassis fpc 4 pic 1 port 2 speed oc48-stm16
set chassis fpc 4 pic 1 port 3 speed oc48-stm16


lab-re0> show lacp interfaces ae4
Aggregated interface: ae4
    LACP state:       Role   Exp   Def  Dist  Col  Syn  Aggr  Timeout  Activity
      xe-7/0/0       Actor    No    No   Yes  Yes  Yes   Yes     Fast    Active
      xe-7/0/0     Partner    No    No   Yes  Yes  Yes   Yes     Slow    Active
      xe-4/1/1       Actor    No    No   Yes  Yes  Yes   Yes     Fast    Active
      xe-4/1/1     Partner    No    No   Yes  Yes  Yes   Yes     Slow    Active
      xe-8/1/0       Actor    No    No   Yes  Yes  Yes   Yes     Fast    Active
      xe-8/1/0     Partner    No    No   Yes  Yes  Yes   Yes     Slow    Active
      xe-9/1/0       Actor    No    No   Yes  Yes  Yes   Yes     Fast    Active
      xe-9/1/0     Partner    No    No   Yes  Yes  Yes   Yes     Slow    Active
    LACP protocol:        Receive State  Transmit State          Mux State
      xe-7/0/0                  Current   Slow periodic Collecting distributing
      xe-4/1/1                  Current   Slow periodic Collecting distributing
      xe-8/1/0                  Current   Slow periodic Collecting distributing
      xe-9/1/0                  Current   Slow periodic Collecting distributing
      

When you add a new member link to the existing AE bundle, an error is reported as follows:

{MASTER}[edit]
lab-re0# set interfaces xe-2/1/1 gigether-options 802.3ad ae4

{MASTER}[edit]
lab-re0# commit check
error: Interface ae4 with child links of mixed speed but link-speed mixed is not configured
error: configuration check-out failed

The Physical Interface Card (PIC) of the FPC is misconfigured with incorrect values for speed.

In the above example, instead of configuring PIC2 for oc48-stm16 speed, PIC1 is configured with this speed. PIC1 is a 10GE port and so does not support this speed, which is why the mixed-speed error is output.

To resolve this problem, correct the speed configuration of the PIC as shown:

lab-re0#set chassis fpc 4 pic 2 port 0 speed oc48-stm16
lab-re0#set chassis fpc 4 pic 2 port 1 speed oc48-stm16
lab-re0#set chassis fpc 4 pic 2 port 2 speed oc48-stm16
lab-re0#set chassis fpc 4 pic 2 port 3 speed oc48-stm16

{MASTER}[edit]
lab-re0# set interfaces xe-2/1/1 gigether-options 802.3ad ae4

{MASTER}[edit]
lab-re0# commit check

{MASTER}[edit]
lab-re0# commit check
configuration check succeeds