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Cisco Bug: CSCup75539 - WS-C2960CG-8TC-L dual root bridge occur when execute "show tech"

Last Modified

Nov 27, 2020

Products (171)

  • Cisco Catalyst 2960-C Series Switches
  • Cisco Catalyst 3560X-48T-E Switch
  • Cisco Catalyst 3560X-48P-S Switch
  • Cisco Catalyst 3560X-48U-S Switch
  • Cisco Catalyst 2960C-12PC-L Switch
  • Cisco Catalyst 2960S-F48FPS-L Switch
  • Cisco Catalyst 3560E-24TD-S Switch
  • Cisco Catalyst 3560E-12D-E Switch
  • Cisco Catalyst 3560E-48PD-SF Switch
  • Cisco Catalyst 2960-48TT-S Switch
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Known Affected Releases


Description (partial)

The two 2960CG-2 were bundled by port-channel.
In general, the  2960CG-2 is the root.
WS-C2960CG-8TC-L dual root bridge issue occur when execute "show tech" on 2960CG-1 or 2960CG-2.

+---------------+G1/9         G1/9+---------------+
|    2960CG-1   +-----------------+    2960CG-2   |
|               +-----------------+               |
+---------------+G1/10       G1/10+---------------+

It also can be reproduced by only one connection.

execute "show tech"

Related Community Discussions

WS-C2960CG-8TC-L で show tech-support を実行するとパケットを受信できなくなる場合があります
2016年1月24日(初版) TAC SR Collection 主な問題 以下の IOS が稼動する WS-C2960CG-8TC-L で show tech-support コマンド、もしくは、show controllers ethernet-controller phy detail コマンドを実行すると、パケットを受信できなくなる場合があります。 15.0(2)SE 15.0(2)SE1 15.0(2)SE2 15.0(2)SE3 15.0(2)SE4 15.0(2)SE5 15.0(2)SE6 15.0(2)SE7 原因 この問題は <key>CSCup75539</key> として報告されております。 解決策 不具合の暫定回避策 : この問題が発生した場合、コンソール経由でのシステムの再起動、もしくは、電源のオフオンで復旧します 改修版ソフトウェア : <key>CSCup75539</key> の修正が適用されたソフトウェアの使用
Latest activity: Mar 21, 2019
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