Switches in a non-stacking configuration support up to six sessions running SSH or Telnet concurrently. However, if stacking is configured, each stacking connection reduces the number of sessions available. For example, five connections into the stack leaves only one session available for SSH or Telnet.
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 these manuals:
For features that are configured on specific switch ports in a stack, the configuration procedures are the same as for stand-alone switches, but the 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 it is shown on the switch. For example, for a switch with stack member ID 3, port 10 on that switch would be identified as port 3/10.
Viewing show interfaces brief
output for port 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 3800 switch configured for stacking require the modified port designations. For example, to enter the port context for port 10 on stack member 2, type:
In the output containing designated port numbers for an HP 3800 switch configured for stacking, the port numbers are likewise listed in the modified format.
Viewing 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:
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):
Using a static IP address avoids these issues. 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 Management and Configuration Guide for your switch.