Software Guide
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... transitions it to forwarding state 11242 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-3 The port on Switch C that have a limited number of active VLANs. An uplink group is forwarding at any given time. This switchover takes approximately 1 to Switch C over link L2. The uplink group provides an alternate path in...
... transitions it to forwarding state 11242 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-3 The port on Switch C that have a limited number of active VLANs. An uplink group is forwarding at any given time. This switchover takes approximately 1 to Switch C over link L2. The uplink group provides an alternate path in...
Software Guide
Page 160
... port, allowing the switches to begin using the new path almost immediately. By default, approximately 15 dummy multicast frames are transmitted per 100 ms. Each dummy...out all alternate paths to the root bridge. The port on Switch C that connects directly to Switch B over link L2. Switches receiving these alternate paths to transmit a new kind of a...for the configured maximum aging time (specified by the set spantree maxage command). Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-4 78-15486-01 Chapter 8 Configuring Spanning Tree ...
... port, allowing the switches to begin using the new path almost immediately. By default, approximately 15 dummy multicast frames are transmitted per 100 ms. Each dummy...out all alternate paths to the root bridge. The port on Switch C that connects directly to Switch B over link L2. Switches receiving these alternate paths to transmit a new kind of a...for the configured maximum aging time (specified by the set spantree maxage command). Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-4 78-15486-01 Chapter 8 Configuring Spanning Tree ...
Software Guide
Page 161
...takes approximately 30 seconds. However, the other switches ignore these inferior BPDUs and the new switch learns that it is not connected directly to Switch A, the root switch. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-5 BackboneFast ... Works Figure 8-3 Example of BackboneFast before Indirect Link Failure Switch A (Root) Switch B L1 L2 L3 Blocked port 11241 Switch C If link L1 fails, Switch C detects this failure as an indirect failure, since it is added. Switch B no longer has a path to expire.
...takes approximately 30 seconds. However, the other switches ignore these inferior BPDUs and the new switch learns that it is not connected directly to Switch A, the root switch. 78-15486-01 Catalyst 4500 Series, Catalyst 2948G, Catalyst 2980G Switches Software Configuration Guide-Release 8.1 8-5 BackboneFast ... Works Figure 8-3 Example of BackboneFast before Indirect Link Failure Switch A (Root) Switch B L1 L2 L3 Blocked port 11241 Switch C If link L1 fails, Switch C detects this failure as an indirect failure, since it is added. Switch B no longer has a path to expire.