34 Converged Enhanced Ethernet Administrator’s Guide
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High availability

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DRAFT: BROCADE CONFIDENTIAL

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
the HA failover occurs.
All telnet/ssh sessions are disconnected and need to be reestablished after
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
(learned via IGMP snooping)
This item is preserved during failover.
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 Thi s item is preserved during failover.
Interface counter s related to CoS,
Flow control, RED Alarms and other
configuration
This item is preserved during failover, however since interface counters are
not preserved, the alarms are restarted upon HA failover.
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
learned groups
This item is preserved during failover.
Static, Dynamic Standard, and
Brocade LAGs
This item is preserved during failover.
ACL policies This item is preserved during failover, however the ACL counters are not
preserved.
LLDP, neighbor information,
profiles, or DCBX state machine
This item is preserved during failover.
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.