Guest

Preview Tool

Cisco Bug: CSCup94206 - Spanning-tree uplinkfast doesn't work on connection GE to FE

Last Modified

Aug 01, 2017

Products (1)

  • Cisco 800 Series Routers

Known Affected Releases

15.4(1.24)T

Description (partial)

Symptom:
Spanning-tree uplinkfast doesn't work on connection GE to FE

Conditions:
[Test Procedure]
1. Connect UUT's GE switchport1 to PEER's GE switchport1
2. Connect UUT's GE switchport2 to PEER2's FE switchport1
3. Connect PEER's GE switchport2 to PEER2's FE switchport2
4. Configure above 6 interfaces "switchport access vlan 1"
5. Enable "spanning-tree vlan 1" on above 3 devices
6. Enable "spanning-tree uplinkfast" on UUT
7. Let PEER2 become spanning-tree router and UUT's GE switchport2 "FWD", GE switchport1 "BLK"
8. Shutdown PEER2's FE switchport1

[The Observation]
For uplinkfast enabled, blocked GE switchport1 should become "FWD" in 5 seconds. However, it needs 30 seconds.
Bug details contain sensitive information and therefore require a Cisco.com account to be viewed.

Bug Details Include

  • Full Description (including symptoms, conditions and workarounds)
  • Status
  • Severity
  • Known Fixed Releases
  • Related Community Discussions
  • Number of Related Support Cases
Bug information is viewable for customers and partners who have a service contract. Registered users can view up to 200 bugs per month without a service contract.