Configuration Guide User guide

FastIron Configuration Guide 331
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Hitless stacking
Layer 3 IPv4 routed traffic
(unicast)
• IPv4 unicast forwarding
• Static routes
• OSPF v2
• OSPF v2 with ECMP
• VRRP
• VRRP-E
Layer 3 routed traffic for supported protocols is not
impacted during a hitless stacking event.
All existing Layer 3 IPv4 multicast flows and receivers
may be interrupted. Traffic will converge to normalcy
after the new active module becomes operational.
Other Layer 3 protocols that are not supported will be
interrupted during the switchover or failover.
If BGP4 graceful restart or OSPF graceful restart is
enabled, it will be gracefully restarted and traffic will
converge to normalcy after the new active module
becomes operational. For details about OSPF graceful
restart, refer to “OSPF graceful restart” on page 1234.
For details about BGP4 graceful restart, refer to “BGP4
graceful restart” on page 1347.
Management traffic N/A All existing management sessions (SNMP, TELNET,
HTTP, HTTPS, FTP, TFTP, SSH etc.), are interrupted
during the switchover process. All such sessions are
terminated and can be re-established after the new
Active Controller takes over.
TABLE 56 Hitless-supported services and protocols
Traffic type Supported protocols and services Impact