Installation guide

A Sample VLAN Topology

Chapter 7

# Failover Modes:

# switch-failover, vlan-failover or port-failover are mutually exclusive.

# They describe what occurs if a port fails. For switch-failover, if any port

# fails, all functionality of the current switch is moved to the backup

# For vlan-failover, if a port fails in the VLAN, then all the ports that

# are a member of that VLAN are failed over. For port-failover, each port

# can failover independently. For VLAN and port-failover the interconnect

# will need to be used to maintain connectivity, requiring all VLANs to

# include the interconnect ports.

failover_mode: switch;

# vrrp_msg_rate is the time in milliseconds between transmissions of

# VRRP messages on the interconnect. The VRRP protocol requires the

# absence of 3 VRRP messages before concluding that the remote Switch Blade

# has failed. The msg_rate must match the msg_rate of all siblings.

# Anything other than multiples of seconds is non-conformant

# with the VRRP specification and will only run with ZNYX supplied

# vrrpd.

vrrp_msg_rate: 100;

# vrrp_def_priority is the base priority used for resolving VRRP mastership

# conflicts. It does not need to be modified unless one Switch Blade is pre-

ferred.

vrrp_def_priority: 254;

After the configuration file is populated, you must enter the following Switch Blade shell command:

zspconfig -f /etc/rcZ.d/surviving_partner/zsp.conf

The zspconfig shell command first checks for syntax errors, and then processes the surviving partner

configuration file. If no errors are discovered, zspconfig creates a new startup script called

/etc/rcZ.d/S70Surviving_partner.

When enabling the Switch Blades to run in HA mode, you must disable any other user created startup scripts

(such as S21cross-shmm, S22mgmt, S23base, and S24isl) because S70Surviving_partner replaces all of

them. The best way to disable a startup script is to rename it with the prefix off . For example:

mv /etc/rcZ.d/S21cross-shmm /etc/rcZ.d/off.S21cross-shmm

mv /etc/rcZ.d/S22mgmt /etc/rcZ.d/off.S22mgmt

mv /etc/rcZ.d/S23base /etc/rcZ.d/off.S23base

mv /etc/rcZ.d/S24isl /etc/rcZ.d/off.S24isl

The zspconfig shell command also packages a counterpart zsp.conf file for the sibling Switch Blade, and

places it in a known location (/tftpboot) where the sibling Switch Blade can find it. After running

zspconfig, the Switch Blade will be running the vrrpd daemon and the dhcpd daemon. The vrrpd daemon