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PXE boot SG500-28 with LACP configured

I've got a SG500-28 that I'm trying to create a dynamic LACP bundle but still have it be able to PXE boot on a primary interface without manual intervention. I've discovered that the following configuration works, as long as I physically disconnect the second (1/20) interface so that the primary(1/8) is the only one with link during the PXE process. The biggest issue from what I can tell is there is no way to tell the second (1/20) interface to be passive. This is covered on pages 192-193 of this guide https://www.cisco.com/c/dam/en/us/td/docs/switches/lan/csbms/Sx500/administration_guide/Cisco_500Sx_v1_4_AG.pdf but it doesn't appear to work as designed or I'm completely missing something.

 

 

interface gigabitethernet1/8
 flowcontrol auto
 negotiation preferred master
 description "Port 1"
 lacp timeout short
 spanning-tree portfast
 channel-group 8 mode auto
 no macro auto smartport
!
interface gigabitethernet1/20
 flowcontrol auto
 description "Port 2"
 lacp timeout short
 no spanning-tree portfast
 channel-group 8 mode auto
 no macro auto smartport
!
interface Port-channel8
 flowcontrol auto
 description "Port-Channel"
 spanning-tree portfast
 switchport trunk allowed vlan add 732
 switchport trunk native vlan 70
!

 

1 REPLY 1
Cisco Employee

Re: PXE boot SG500-28 with LACP configured

Hi,

Please change the LACP port priority to 2 for the second interface (1/20) and check the status once (the default priority is 1). I think you want to achieve the below mentioned output (please check the partner section output for the port gi1/1/20)…

 

switchc6f8a9#show lacp parameters gi1/1/8

gi1/1/8 LACP parameters:

      Actor

              system priority:       1

              system mac addr:       00:8e:73:c6:f8:a9

              port Admin key:        1000

              port Oper key:         1000

              port Oper number:      56

              port Admin priority:   1

              port Oper priority:    1

              port Admin timeout:    LONG

              port Oper timeout:     LONG

              LACP Activity:         ACTIVE

              Aggregation:           AGGREGATABLE

              synchronization:       TRUE

              collecting:            TRUE

              distributing:          TRUE

              expired:               FALSE

      Partner

              system priority:       1

              system mac addr:       20:37:06:33:ee:6f

              port Admin key:        0

              port Oper key:         1000

              port Oper number:      56

              port Admin priority:   0

              port Oper priority:    1

              port Oper timeout:     LONG

              LACP Activity:         ACTIVE

              Aggregation:           AGGREGATABLE

              synchronization:       TRUE

              collecting:            TRUE

              distributing:          TRUE

              expired:               FALSE

switchc6f8a9#show lacp parameters gi1/1/20

gi1/1/20 LACP parameters:

      Actor

              system priority:       1

              system mac addr:       00:8e:73:c6:f8:a9

              port Admin key:        1000

              port Oper key:         1000

              port Oper number:      68

              port Admin priority:   2

              port Oper priority:    2

              port Admin timeout:    LONG

              port Oper timeout:     LONG

              LACP Activity:         ACTIVE

              Aggregation:           AGGREGATABLE

              synchronization:       FALSE

              collecting:            FALSE

              distributing:          FALSE

              expired:               FALSE

      Partner

              system priority:       0

              system mac addr:       00:00:00:00:00:00

              port Admin key:        0

              port Oper key:         0

              port Oper number:      0

              port Admin priority:   0

              port Oper priority:    0

              port Oper timeout:     LONG

              LACP Activity:         PASSIVE

              Aggregation:           AGGREGATABLE

              synchronization:       FALSE

              collecting:            FALSE

              distributing:          FALSE

              expired:               FALSE

switchc6f8a9#

And make sure the switch firmware is latest 1.4.10.6.

switchc6f8a9#show version

 

       Unit             SW version         Boot version         HW version

------------------- ------------------- ------------------- -------------------

         1               1.4.10.6            1.4.0.02               V03

 

switchc6f8a9#show system

 

Unit          Type

---- ----------------------

 1        SG500-28MPP

 

Unit   FAN

       Status

----   ---------

 1        OK

 

Unit   Temperature (Celsius)   Temperature Sensor Status

---- ------------------------- -------------------------

 1              28                        OK

 

 

Unit     Up time

---- ---------------

 1     00,00:31:23

 

switchc6f8a9#s

 

Note: Please take a configuration back-up (working condition) from the mentioned switches before changing any configuration on the switch.

Please check the attached snapshot as well.