We have 5 N-series switches across various data rooms at one of our sites. In the main server room we have an N3024P (two switches come into the two SFP ports, Te1/0/1 and Te1/0/2), and an N2024P (one switch comes into its Te1/0/2). We wanted to connect these two server room switches via fibre; we need as many of the copper ports as are available. So we connected N3024P-Gi1/0/24 to N2024P-Te1/0/1; set the speed of Te1/0/1 to 1000; and brought up both ports. Everything seems to be working fine.
However, upon a reboot of the N3024P, its Gi1/0/24 goes into D-DOWN state. If I execute 'no shutdown' on the interface everything is fine.
I have searched for a solution, and have tried the suggestions regarding disabling spanning-tree and explicitly enabled portfast. Neither seems to work.
For the time being we have gone for a copper port uplink, but I'd like to get to the bottom of this issue.
Any guidance would be most appreciated.
advTHANKSance.
Here are the log entries that I pulled:
<189> Feb 24 01:51:24 F1-DEM-L3-1-1 TRAPMGR[dot1s_task]: traputil.c(777) 354 %% Spanning Tree Topology Change Received: MSTID: 0 Te1/0/1
<189> Feb 24 01:51:23 F1-DEM-L3-1-1 TRAPMGR[dot1s_task]: traputil.c(777) 353 %% Spanning Tree Topology Change Received: MSTID: 0 Te1/0/2
<189> Feb 24 01:51:23 F1-DEM-L3-1-1 TRAPMGR[trapTask]: traputil.c(735) 352 %% Gi1/0/4 is transitioned from the Forwarding state to the Blocking state in instance 0
<189> Feb 24 01:51:23 F1-DEM-L3-1-1 TRAPMGR[trapTask]: traputil.c(735) 351 %% Link on Gi1/0/24 is failed
<189> Feb 24 01:51:23 F1-DEM-L3-1-1 TRAPMGR[trapTask]: traputil.c(735) 350 %% Link Down: Gi1/0/24
<189> Feb 24 01:51:23 F1-DEM-L3-1-1 TRAPMGR[trapTask]: traputil.c(735) 349 %% Link Up: Gi1/0/4
<189> Feb 24 01:51:23 F1-DEM-L3-1-1 TRAPMGR[trapTask]: traputil.c(735) 348 %% Gi1/0/3 is transitioned from the Forwarding state to the Blocking state in instance 0
<189> Feb 24 01:51:23 F1-DEM-L3-1-1 TRAPMGR[trapTask]: traputil.c(735) 347 %% Link Up: Gi1/0/3
<189> Feb 24 01:51:23 F1-DEM-L3-1-1 TRAPMGR[trapTask]: traputil.c(735) 346 %% Gi1/0/24 is transitioned from the Forwarding state to the Blocking state in instance 0
<188> Feb 24 01:51:23 F1-DEM-L3-1-1 TRAPMGR[trapTask]: traputil.c(735) 345 %% INSERT_OPTICS_PLUS: Optics SFP+ inserted in Te1/0/2
<188> Feb 24 01:51:23 F1-DEM-L3-1-1 TRAPMGR[trapTask]: traputil.c(735) 344 %% INSERT_OPTICS_PLUS: Optics SFP+ inserted in Te1/0/1
<189> Feb 24 01:51:23 F1-DEM-L3-1-1 TRAPMGR[boxs Req]: traputil.c(777) 343 %% Temperature state change alarm: Unit Number: 1 Current: Normal, Previous: None
<189> Feb 24 01:51:23 F1-DEM-L3-1-1 TRAPMGR[dot1s_task]: traputil.c(777) 342 %% Spanning Tree Topology Change Received: MSTID: 0 Gi1/0/24
<189> Feb 24 01:51:23 F1-DEM-L3-1-1 TRAPMGR[trapTask]: traputil.c(735) 341 %% Gi1/0/24 is transitioned from the Learning state to the Forwarding state in instance 0
<189> Feb 24 01:51:23 F1-DEM-L3-1-1 TRAPMGR[trapTask]: traputil.c(735) 340 %% Gi1/0/24 is transitioned from the Forwarding state to the Blocking state in instance 0
<189> Feb 24 01:51:23 F1-DEM-L3-1-1 TRAPMGR[trapTask]: traputil.c(735) 339 %% Link Up: Gi1/0/24