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164 PowerConnect B-Series FCX Configuration Guide
53-1002266-01
PowerConnect B-Series FCX hitless stacking
5
TABLE 37 Hitless-supported services and protocols – PowerConnect B-Series FCX
Traffic type Supported protocols and services Impact
Layer 2 switched traffic,
including unicast and
multicast
+
System-level
+
Layer 4
• 802.1p and 802.1Q
• 802.3ad – LACP
• DSCP honoring and Diffserv
• Dual-mode VLAN
• IGMP v1, v2, and v3 snooping
• IPv4 ACLs
• Layer 2 ACLs
• Layer 2 switching (VLAN and 802.1Q-in-Q)
• MAC-based VLANs
• MLD v1 and v2 snooping
• MRP
• Multiple spanning tree (MSTP)
• Physical port/link state
• PIM SM snooping
• Port mirroring and monitoring
• Port trunking
• Rapid spanning tree (RSTP)
• Spanning tree (STP)
• ToS-based QoS
• Traffic policies
• UDLD
• VSRP
Layer 2 switched traffic is not impacted during a hitless
stacking event. All existing switched traffic flows
continue uninterrupted.
New switched flows are not learned by the switch
during the switchover process and are flooded to the
VLAN members in hardware. After the new Active
Controller becomes operational, new switched flows
are learned and forwarded accordingly. The Layer 2
control protocol states are not interrupted during the
switchover process.
Layer 3 IPv4 routed traffic
(unicast)
• BGP4
• IPv4 unicast forwarding
• OSPF v2
• OSPF v2 with ECMP
• Static routes
• 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 930.
For details about BGP4 graceful restart, refer to “BGP4
graceful restart” on page 987.
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.