Brocade Communications Systems 53-1002163-02 manual High availability reference

5 High availability

Every configuration is either fully committed or not, but never “half-complete.” If you had started executing the copy startup running command, it will be resumed after failover before any new CLI is allowed to be executed.

High availability reference

This section contains reference tables for high availability.

TABLE 10 State preservation during CP failover

Operation, data, or state	Expected behavior
CLIs that are being executed when	All telnet/ssh sessions are disconnected and need to be reestablished after
the HA failover occurs.	failover.
	Any CLI operation under progress will either be fully committed if its
	execution had started on active CP or not executed completely.
	The vty timeout configuration is preserved across failover.
Running and Startup configurations	The running and startup configuration is preserved.
	All other configuration files are preserved.
L2 forwarding table	This item is preserved during failover.
VLAN table and state	This item is preserved during failover.
Static Multicast MAC DA	This item is preserved during failover.
Dynamic Multicast MAC DA	This item is preserved during failover.
(learned via IGMP snooping)
MAC learning process	MAC learning entries that are in the ASIC queue but yet to be processed by
	software is flushed.
MAC ageing timer	The timer is restarted after the failover.
Station moves during failover	Station moves are not detected.
Interface state	Preserved as long as the interfaces are either in a shut or no-shut state. Any
	interface which is not fully initialized is reset.
Interface counters	This item is preserved during failover.
Interface counters related to CoS,	This item is preserved during failover, however since interface counters are
Flow control, RED Alarms and other	not preserved, the alarms are restarted upon HA failover.
configuration
xSTP Port STP state	This item is preserved as long as the ports are in a steady state, otherwise
	the port state machine is reset.
IGMP snooping – Dynamically	This item is preserved during failover.
learned groups
Static, Dynamic Standard, and	This item is preserved during failover.
Brocade LAGs
ACL policies	This item is preserved during failover, however the ACL counters are not
	preserved.
LLDP, neighbor information,	This item is preserved during failover.
profiles, or DCBX state machine
QoS policies	This item is preserved during failover.
Port authentication state	Preserved during failover, as long as the ports are in a steady state,
	otherwise the port state machine are reset.
SNMP sessions	Reset during failover. SNMP manager must reconnect after the failover.

34	Converged Enhanced Ethernet Administrator’s Guide
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