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Chapter 5: Switching Commands
333
spanning-tree
uplinkfast
Use this command to configure the rate at which gratuitous frames are sent (in
packets per second) after switchover to an alternate port on PVSTP configured
switches and enables uplinkfast on PVSTP switches. The range is 0-32000; the
default is 150. This command has the effect of accelerating spanning-tree
convergence after switchover to an alternate port.
Uplinkfast can be configured even if the switch is configured for MST(RSTP)
mode, but it only has an effect when the switch is configured for PVST mode.
Enabling FastUplink increases the priority by 3000. Path costs less than 3000
have an additional 3000 added when uplinkfast is enabled. This reduces the
probability that the switch will become the root switch.
Uplinkfast immediately changes to an alternate root port on detecting a root port
failure and changes the new root port directly to the fowarding state. A TCN is
sent for this event.
After a switchover to an alternate port (new root port), uplinkfast multicasts a
gratuitous frame on the new root port on behalf of each attached machine so that
the rest of the network knows to use the secondary link to reach that machine.
PVRSTP embeds support for backbonefast and uplinkfast. There is no provision
to enable or disable these features in PVRSTP configured switches.
no spanning-tree
uplinkfast
This command disables uplinkfast on PVSTP configured switches. All switch
priorities and path costs that have not been modified from their default values are
set to their default values.
show spanning-tree
This command displays spanning tree settings for the common and internal
spanning tree. The following details are displayed.
Default
150
Format
spanning-tree uplinkfast [max-update-rate
packets
]
Mode
Global Config
Format
no spanning-tree uplinkfast [max-update-rate]
Mode
Global Config
Format
show spanning-tree
Summary of Contents for CN1610
Page 3: ......
Page 31: ...28 Accessing the CLI ...
Page 309: ...306 Remote Monitoring Commands ...
Page 473: ...470 Port Mirroring Commands 100 ...
Page 487: ...484 DHCP L2 Relay Agent Commands Mode Privileged EXEC ...
Page 607: ...604 IPv6 Management Commands ...