Enabling Uplinkfast - Cisco 7609 Configuration Manual
Cisco ios software configuration guide—12.1e
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Enabling UplinkFast
This example shows how to verify the configuration:
Router# show spanning-tree summary totals default
Root bridge for:VLAN0010
EtherChannel misconfiguration guard is enabled
Extended system ID
Portfast
PortFast BPDU Guard
Portfast BPDU Filter is enabled by default
Loopguard
UplinkFast
BackboneFast
Pathcost method used is long
Name
---------------------- -------- --------- -------- ---------- ----------
2 vlans
Router#
Enabling UplinkFast
UplinkFast increases the bridge priority to 49152 and adds 3000 to the STP port cost of all Layer 2 LAN
interfaces on the Cisco 7600 series router, decreasing the probability that the router will become the root
bridge. The max_update_rate value represents the number of multicast packets transmitted per second
(the default is 150 packets per second). UplinkFast cannot be enabled on VLANs that have been
configured for bridge priority. To enable UplinkFast on a VLAN with bridge priority configured, restore
the bridge priority on the VLAN to the default value by entering a no spanning-tree vlan vlan_ID
priority command in global configuration mode.
Note
When you enable UplinkFast, it affects all VLANs on the Cisco 7600 series router. You cannot configure
UplinkFast on an individual VLAN.
To enable UplinkFast, perform this task:
Command
Step 1
Router(config)# spanning-tree uplinkfast
[max-update-rate max_update_rate]
Router(config)# no spanning-tree uplinkfast
max-update-rate
Router(config)# no spanning-tree uplinkfast
Step 2
Router(config)# end
Step 3
Router# show spanning-tree vlan vlan_ID
This example shows how to enable UplinkFast with an update rate of 400 packets per second:
Router# configure terminal
Router(config)# spanning-tree uplinkfast max-update-rate 400
Router(config)# exit
Router#
Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
16-12
is disabled
is enabled by default
is disabled by default
is disabled by default
is disabled
is disabled
Blocking Listening Learning Forwarding STP Active
0
0
Purpose
Enables UplinkFast.
Reverts to the default rate.
Disables UplinkFast.
Exits configuration mode.
Verifies that UplinkFast is enabled.
Chapter 16
Configuring Optional STP Features
0
3
3
78-14064-04
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Troubleshooting
