Znyx Networks bh5700 - Manual (Page 30)

The configuration and runtime scripts created are as follows:
• S70Surviving_partner Switch initialization script that is run at boot time. This
script will restart the switch with the original configuration given to zspconfig.
Optionally, zspconfig will run this script from the initial invocation.
• zsp.conf.<n> - zspconfig configuration file that contains the configuration of
the sibling backup switches. The <n> is used to distinguish potentially more than one
backup switch. This configuration file is placed in /tftpboot, and is retrieved via
DHCP during configuration of the backup switch by zspconfig with the “-u” option
or, by a replacement switch on boot up.
• vrrpd.conf - Configuration script for the VRRP daemon. This configuration is
used when the S70Surviving_partner script launches vrrpd. There is a line in this file for
each virtual router address vrrpd will manage.
• dhcpd.conf - Configuration script used by dhcpd when the switch becomes
master. dhcpd is also used to give replacement switches their configuration scripts.
Namely a zsp_.conf<n> file that can be input to zspconfig with the -u flag.
• dhclient.conf - If zspconfig is executed with the -u flag, a dhclient.conf file
is created, and then dhclient is used to retrieve a zspconfig configuration file from the
/tftpboot area of the Master switch.
• vrrpd.script - Runtime script that executes each time the vrrpd changes state.
This script starts and stops dhcpd, and toggles down RAINlink ports to force the
RAINlink nodes to a new Master switch.
• zlmd.script - Runtime script executed by zlmd when a link goes up or down. This
script modifies the priority of the vrrpd that in turn may cause the VRRP Master to move
from one sibling switch to another.
After the scripts are created, zspconfig may run the S70Surviving_partner script to start
the Surviving Partner tasks. The tasks started are vrrpd, zlmd, and dhcpd.
The vrrpd and zlmd daemons run scripts to perform their actions. When vrrpd changes state
between Master and Backup, it runs a script that starts and stops dhcpd. When zlmd sees a link
go up or down, it runs a script that communicates with vrrpd via vrrpconfig.
Example HA Switch Configuration
The following walks through a basic Surviving Partner configuration typical for an HA setup.
Assume an HA chassis with multiple hosts, such as single-board CPUs, and two switches
configured for Surviving Partner. Each of the hosts has two Base Ethernet ports providing a link
to each of the Base switches and up to four fabric Ethernet ports providing links to each of the
Fabric switches.
Each host runs Linux bonding drivers (or ZNYX OA Node software with embedded RAINlink)
with the ports configured for failover. An interlink provides communication between the Base
switches. Another interlink provides communication between the Fabric switches.
Ethernet Switch Blade User's Guide release 3.2.2j page 30