Cause If all OOBM ports in the stack are in the same VLAN, you can use the
show oobm commands to view the current state of all switches. For example, if you have a four-member chain and member 4 fails or loses power, a stack split occurs with an active fragment on members 1-2-3 and an inactive fragment on member 4.
There is one IP address for the active fragment, which can be statically set by assigning an IP address to the global OOBM port.
If the stack splits, you can connect to the Active Fragment using the global OOBM IP address and then enter the
show oobm discovery command to see if this active fragment has discovered any other members that are connected using the OOBM LAN.
Action-
In the following four member chain example, the user connected using the global IP address of 10.0.11.49, logged on, and entered the
show stacking command.
Displaying stacking member status
switch# show stacking
Stack ID : 00011cc1-de4d87c0
MAC Address : 1cc1de -4d87e5
Stack Topology : Chain
Stack Status : Fragment
Active Uptime : 0d 0h 5m
Software Version : WB.15.11.0000x
Mbr
ID Mac Address Model Pri Status
--- ------------- -------------------------------------- --- ---------------
1 1cc1de-4d87c0 HPE J9727A 2920-24G-PoE+-2SFP+ Switch 128 Commander
2 1cc1de-4dc740 HPE J9727A 2920-24G-PoE+-2SFP+ Switch 128 Member
3 1cc1de-4dbd40 HPE J9726A 2920-24G-2SFP+ Switch 128 Standby
4 1cc1de-4da900 HPE J9728A 2920-48G-4SFP+ Switch 200 Missing
.
-
The user then entered the
show oobm discovery command to see if the members were discoverable using OOBM
Displaying oobm discovery
switch# show oobm discovery
Active Stack Fragment(discovered) IP Address: 10.0.11.49
Mbr
ID Mac Address Status
--- -------------- ----------
1 1cc1de-4d87c0 Commander
2 1cc1de-4dc740 Member
3 1cc1de-4dbd40 Standby
Inactive Stack Fragment(discovered) IP Address : 10.0.10.98
Mbr
ID Mac Address Status
--- -------------- ----------
4 1cc1de-4da900 Commander
Member 4 is up but is an inactive fragment with an addressable IP address that can be used to connect to it.
-
Connecting to a stack fragment
switch# telnet 10.0.10.98 oobm
HPE J9728A 2920-48G-4SFP+ Switch
Software revision WB.15.11.0000x
Copyright (C) 1991-2013 Hewlett-Packard Development Company, L.P.
RESTRICTED RIGHTS LEGEND
Confidential computer software. Valid license from HPE required for possession,
use or copying. Consistent with FAR 12.211 and 12.212, Commercial
Computer Software, Computer Software Documentation, and Technical
Data for Commercial Items are licensed to the U.S. Government under
vendor's standard commercial license.
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
20555 State Highway 249, Houston, TX 77070
-
Displaying missing stack members
switch# show stacking
Stack Topology : Chain
Stack Status : Fragment Inactive
Uptime : 0d 0h 7m
Software Version : WB.15.11.0000x
Mbr
ID Mac Address Model Pri Status
--- ------------- -------------------------------------- --- ---------------
1 1cc1de-4d87c0 HPE J9727A 2920-24G-PoE+-2SFP+ Switch 128 Missing
2 1cc1de-4dc740 HPE J9727A 2920-24G-PoE+-2SFP+ Switch 128 Missing
3 1cc1de-4dbd40 HPE J9726A 2920-24G-2SFP+ Switch 128 Missing
4 1cc1de-4da900 HPE J9728A 2920-48G-4SFP+ Switch 200 Commander
-
Confirm by entering the
oobm discovery command. Member 4 is down.
Confirming stack member 4 is down
switch# show oobm discovery
Inactive Stack Fragment(discovered) IP Address: 10.0.10.98
Mbr
ID Mac Address Status
--- -------------- ----------
4 1cc1de-4da900 Commander
Active Stack Fragment(discovered) IP Address: 10.0.11.49
Mbr
ID Mac Address Status
--- -------------- ----------
1 1cc1de-4d87c0 Commander
2 1cc1de-4dc740 Member
3 1cc1de-4dbd40 Member