Extreme Networks ExtremeWare XOS Guide User Manual

Managing the Switch
ExtremeWare XOS 11.3 Concepts Guide
78
Hitless Failover Caveats
This section describes the caveats for hitless failover. Please check the latest version of the ExtremeWare
XOS release notes for additional information.
Caveats for All Modular Switches
The following is a summary of hitless failover caveats for all modular switches:
● A brief traffic interruption (less than 1/2 of a second) can occur when the failover happens due to
reprogramming of the I/O modules to bypass the original primary MSM’s switch chips.
● There is a 50% reduction in backplane bandwidth during a failover.
Caveats for the BlackDiamond 8800 Family of Switches
The following is a summary of hitless failover caveat s for only the BlackDiamond 8800 family of
switches:
● MSM I/O ports on the original primary MSM are not available during the failover and this
MSM I/O subsection is power cycled. It takes about 2 minutes for these MSM I/O ports to be able to
pass traffic again.
● I/O modules not yet in the Operational state are powered off and the card state machine is restarted
to bring them to the Operational state. This results in a delay in the I/O module becoming
Operational.
Understanding Power Supply Management
This section describes how ExtremeWare XOS manages power consumption on the switch and contains
the following topics:
● Using Power Supplies—Modular Switches Only on page 79
● Using Power Supplies—Summit X450 Switch Only on page 81
● Displaying Power Supply Information on page 82
Table 12: Platform support for hitless failover
Platform Protocol ExtremeWare XOS Version
BlackDiamond 10K ESRP ExtremeWare XOS 11.0
BlackDiamond 10K OSPF graceful restart ExtremeWare XOS 11.3
BlackDiamond 10K Network login ExtremeWare XOS 11.3
BlackDiamond 10K STP ExtremeWare XOS 11.0
BlackDiamond 8800 family ESRP ExtremeWare XOS 11.3
BlackDiamond 8800 family Network login ExtremeWare XOS 11.3
BlackDiamond 8800 family OSPF graceful restart ExtremeWare XOS 11.3
BlackDiamond 8800 family PoE ExtremeWare XOS 11.3
BlackDiamond 8800 family STP ExtremeWare XOS 11.3

Extreme Networks ExtremeWare XOS Guide Specifications

General

Brand	Extreme Networks
Model	ExtremeWare XOS Guide
Category	Software
Language	English