Managing interactions with other switch features

Managing switch-level configuration interactions

In a stack, the Commander functions as a single switch and the Standby and Members function as additional network ports for that switch. Switch configuration is performed in the same manner as for any other switch, as described in the other HP 2920 manuals.

Managing port-level configuration interactions

For features configured on specific switch ports in a stack, configuration procedures are the same as for stand-alone switches, but port designations for the ports in the stack are modified. Each port is identified by the stack member ID of its switch followed by a slash and then the port number as shown on the switch. For example, for a switch with stack member ID 3, port 10 on that switch is identified as port 3/10.

Displaying show interfaces brief output for stack member 3 port 10, interface 3/10

HP Switch(config)#: show interfaces brief 3/10

 Status and Counters - Port Status

                         | Intrusion                           MDI  Flow Bcast
  Port         Type      | Alert     Enabled Status Mode       Mode Ctrl Limit
  ------------ --------- + --------- ------- ------ ---------- ---- ---- -----
  3/10         100/1000T | No        Yes     Down   1000FDx         off  0

Similarly, CLI commands requiring specific port (interface) numbers on an HP 2920 switch configured for stacking require modified port designations. For example, to enter the port context for port 10 on stack member 2, enter this command:

HP Switch(config)#: interface 2/10   HP Switch(eth-2/10)#:_

In the output containing designated port numbers for an HP 2920 switch configured for stacking, port numbers are likewise listed in the modified format.

Displaying show interfaces config output

HP Switch(config)#: show interfaces config

 Port Settings

  Port   Type      | Enabled Mode         Flow Ctrl MDI
  ------ --------- + ------- ------------ --------- ----
  1/1    100/1000T | Yes     Auto         Disable   Auto
  1/2    100/1000T | Yes     Auto         Disable   Auto
  1/3    100/1000T | Yes     Auto         Disable   Auto
   .
   .
   .
  2/1    100/1000T | Yes     Auto         Disable   Auto
  2/2    100/1000T | Yes     Auto         Disable   Auto
  2/3    100/1000T | Yes     Auto         Disable   Auto
  2/4    100/1000T | Yes     Auto         Disable   Auto
.
.
.

Attempting to enter a CLI command for a port on a stack member without using the modified port number format generates a “Module not present...” message such as the following:

HP Switch(config)#: interface 10
Module not present for port or invalid port: 10
HP Switch(config)#:

Troubleshooting stacking problems

The show logging command troubleshoots problems in stacking.

Syntax

show logging [a|r|m|p|w|i|d|substring]

The options a|r|substring can be used in combination with an event class option.

`a`	Instructs the switch to display all recorded log events, which includes events from previous boot cycles.
`r`	Instructs the switch to display recorded log events in reverse order (most recent first.)
`substring`	Instructs the switch to display only those events that match the substring.

The remaining event class options are listed in order of severity with lowest severity first. The output of the command is confined to event classes of equal or higher severity.

Only one of options d|i|w|e|p|m can be used in the command at a time.

`m`	Displays major type of messages.
`p`	Displays major and error type of messages.
`w`	Displays major, error and warning type of messages.
`i`	Displays major, error, warning and information.
`d`	Displays major, error, warning, information and debug messages.

Logging output

HP Stack 3800 #: show logging -r -s
I 10/02/00 00:46:56 02558 chassis: ST1-STBY: Stack port 3 is now on-line.
I 10/02/00 00:46:56 02558 chassis: ST2-CMDR: Stack port 2 is now on-line.

Managing OOBM ports

Each OOBM port of a member is assigned one MAC address from that member's manufacturing allocated range. The OOBM port also can be assigned an IP address (IPv4 /v6/DHCP/Manual/Auto-Config/LinkLocal). The Commander's OOBM IP address (called the Global IP address) is used for managing the Commander through the OOBM port.

After switchover/failover of control from the Commander to the Standby, the OOBM port IP address of the new Commander is the Global IP address. This change in address causes some undesirable behavior (after failover):

When using DHCP or DHCPv6, the new Commander requests a new lease and typically receives a new network address (IPv4 or IPv6). With OOBM high availability (HA), it will seem as if a new link has come up requesting a network address.
IPV6 link-local or auto-config addresses will change.

To avoid these issues, use a static IP address. During failover, it will be as if the IP address is reconfigured. All ARP entries are updated automatically.

For more information on OOBM operation, see the appendix, “Network Out-of-Band for the HP 2920 Switches,” in the latest Management and Configuration Guide for your HP 2920 switch.

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