Dynamic Virtual IP Address
A virtual IP address (VIPA) refers to an Internet address on a z/OS host that is not associated with a physical adapter. A Dynamic VIPA (DVIPA) is a virtual Internet address that can move dynamically to other TCP/IP stack members in a sysplex.
A VIPA is configured on a TCP/IP stack. When you configure multiple paths to a stack by using VIPA and conventional IP addresses, you can eliminate hardware and transmission media as single points of failure for many connections. If a TCP/IP or its host operating system suffers an outage (for example, a power failure), you can move the VIPA to another TCP/IP stack. DVIPA automatically moves a VIPA to other TCP/IP stack members in a sysplex.
MainView for IP provides the Dynamic VIPA views that you can use to monitor the DVIPAs on your z/OS host. These views display details about DVIPA configuration, DVIPA routing connection tables, and DVIPA destination port tables. You can use these views to identify the distribution of your TCP/IP resources that are attached to z/OS TCP/IP stacks.
The SYSPLEX views show all the dynamic VIPA’s for all the TCP/IP stacks in the sysplex. You can drill down on each dynamic VIPA and get more detailed information.
The following table describes the views that provide information about your DVIPAs:
Dynamic VIPA views
View | Description |
|---|---|
EZVIPA | Provides access to the Dynamic VIPA menu |
SYSPLEX | Displays dynamic virtual IP addresses (VIPAs) for all the TCP/IP stacks in the same sysplex as the current stack. |
SYSPLXCF | Displays all TCP/IP stacks in the sysplex, and the dynamic cross-system coupling facility (XCF) address that each stack is using. |
VIPACFG1 | Displays VIPA backup configuration information |
VIPACFG2 | Displays VIPA definition configuration information |
VIPACFG3 | Displays VIPA range configuration information |
VIPADST | Displays VIPA distribution configuration information |
VIPACFG5 | Displays VIPA service level agreement policy information |
VIPACFG6 | Displays VIPA route configuration information |
VIPACONN | Displays all the connections that are being routed through the sysplex distributor to the dynamic VIPA |
VIPADYN | Displays general information about DVIPA |
VIPAPORT | Displays the VIPA destination port table information, which exists only on distributing stacks |
VIPAROUT | Displays route information |
The VIPCONN view displays all the connections that are being routed through the sysplex distributor to the dynamic VIPA.
VIPACONN view
COMMAND ===> SCROLL ===> PAGE
CURR WIN ===> 1 ALT WIN ===>
M1 =VIPACONN=========TCPIP2======*=======19FEB2012==02:45:05=====MVIP=====D====0
Dest Dest Source Source Destination Stack
IPAddr Port IPAddr Port XCFAddr Name
172.19.170.20 21 172.18.198.67 3150 172.19.170.130 TCPIP2
172.19.170.20 21 172.18.198.67 3157 172.19.170.130 TCPIP2
172.19.170.20 21 172.18.198.67 3161 172.19.170.130 TCPIP2
172.19.170.20 21 172.18.198.67 3159 172.19.170.130 TCPIP2
172.19.170.20 21 172.18.198.67 3301 172.19.170.130 TCPIP2
172.19.170.20 21 172.18.198.67 3141 172.19.170.130 TCPIP2
The VIPAPORT view displays the VIPA destination port table information. The destination port table exists only on distributing stacks.
VIPAPORT view
COMMAND ===> SCROLL ===> PAGE
CURR WIN ===> 1 ALT WIN ===>
>W1 =VIPAPORT==========TCPIP2======*=====19FEB2012==02:04:05====MVIP=====D====0
Dest Dest Destination Total Active Dist
IPAddr Port XCF Address RDY Conns Conns WLM Method
172.24.49.130 3049 172.24.49.141 0 0 1 Roundrobin
172.24.49.130 3049 172.24.49.142 0 0 1 Roundrobin
172.24.49.131 20 172.24.49.142 0 0 0 ServerWLM
172.24.49.131 21 172.24.49.142 1 0 12 ServerWLM