No layer 2 traffic on several ports on a 4507

[Charles Hill]

No layer 2 traffic on several ports on blade 7 on a 4507.  The trouble is isolated to blade 7 only and only 8 to 10 ports are not working at layer 2.  We have reloaded the switch and replaced the blade.  Two sup engines one is active and the other is standby hot.  We have plugged laptops and a 7945 into the port and layer one is working, but not layer 2.  It show up and up, but when you show mac-address-table, there are no entries.  Currently a 7945 is plugged into one of the ports and it is stuck at configuring ip and of course show mac shows nothing.  Any assistance would greatly be appreciated!!!

These ports worked fine until about a week ago, when the switch was powered down.

Catalyst 4500 L3 Switch Software (cat4500e-IPBASEK9-M)

Mod Ports Card Type                              Model
---+-----+--------------------------------------+------------------
1    48  10/100/1000BaseT POE E Series          WS-X4648-RJ45V-E
2    48  10/100/1000BaseT POE E Series          WS-X4648-RJ45V-E
3     6  Sup 6-E 10GE (X2), 1000BaseX (SFP)     WS-X45-SUP6-E
4     6  Sup 6-E 10GE (X2), 1000BaseX (SFP)     WS-X45-SUP6-E
5    48  10/100/1000BaseT POE E Series          WS-X4648-RJ45V-E
6    48  10/100/1000BaseT POE E Series          WS-X4648-RJ45V-E
7    48  10/100/1000BaseT POE E Series          WS-X4648-RJ45V-E

interface GigabitEthernet7/38
switchport access vlan 5
switchport mode access
switchport voice vlan 4
spanning-tree portfast

CYTN_4507#sh int g7/38 switchport
Name: Gi7/38
Switchport: Enabled
Administrative Mode: static access
Operational Mode: static access
Administrative Trunking Encapsulation: dot1q
Operational Trunking Encapsulation: native
Negotiation of Trunking: Off
Access Mode VLAN: 5 (VLAN0005)
Trunking Native Mode VLAN: 1 (default)
Administrative Native VLAN tagging: enabled
Voice VLAN: 4 (VLAN0004)
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL

Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Appliance trust: none

[Reza Sharifi]

You have a lots of POE ports.  Are your power supplies big enough to support all theses POE ports?

HTH

Reza

[Charles Hill]

Yes.

We haven't had any issues with any poe devices coming up.  I have ran into that issue before and to temporarily resolve the issue, I was able to modify the power supply settings.  I changed the power from "power redundancy-mode redundant" to power redundancy-mode combined.  This got us by until we got larger power supplies.  But back to my issue.  Any ideas why layer 2 is not working?

CYTN_4507#sh power status
Power                                             Fan      Inline
Supply  Model No          Type       Status       Sensor   Status
------  ----------------  ---------  -----------  -------  -------
PS1     PWR-C45-2800AC    AC 2800W   good         good     good
PS2     PWR-C45-2800AC    AC 2800W   good         good     good

CYTN_4507#sh power available
Power Summary                      Maximum
(in Watts)              Used     Available
----------------------   ----     ---------
System Power (12V)       1040        1360
Inline Power (-50V)       970        1400
Backplane Power (3.3V)     40          40
----------------------   ----     ---------
Total                    2050        2800

[Charles Hill]

The issue was related to the hw-module uplink mode shared-backplane

command.

I have experienced the trouble twice on 4507s and its after entering the hw-module uplink mode shared-backplane and not doing a cold reboot.  A single reload on one sup engine will not suffice.  To eliminate a cold reboot, you can perform a reload on both sup engines, which should work as well.