[c-nsp] Catalyst 2950 freezing

[Christian Kratzer]

Hi,

On Mon, 19 Dec 2011, Henry-Nicolas Tourneur wrote:

> After doing a bit more of troubleshooting and debugging, I got the following
> error message on my term:
>
> 01:10:45: pm_flap_timer_start: Fa0/2 dtp
> 01:10:29: pm_flap_timer_start: Fa0/1 dtp
> 01:10:41: pm_flap_timer_start: Fa0/12 dtp
>
>
> Also, all errdisable detection are enabled but no recovery mechanism is
> active.
> So, I'm considering the following command to enable dtp-flap recovery:
> errdisable recovery cause dtp-flap
>
> Yet, I'm not sure what dtp-flap really is, any clue on this?

dynamic trunking ?

Add a switchport mode access to force the ports into access mode.

Greetings
Christian

>
> Regards,
>
>
> -----Original Message-----
> From: cisco-nsp-bounces at puck.nether.net
> [mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Henry-Nicolas
> Tourneur
> Sent: lundi 19 décembre 2011 12:05
> To: 'Christian Kratzer'
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Catalyst 2950 freezing
>
> Hello,
>
> Switch configuration for customer ports is below.
> If you have any recommendations, they are welcome :-)
>
> Current configuration : 190 bytes
> !
> interface FastEthernet0/1
> description #customer: CUST01i_L2 [4M]
> switchport access vlan 115
> load-interval 30
> speed 10
> duplex full
> no cdp enable
> spanning-tree bpdufilter enable
> end
>
> SWITCH#sri fa0/2
> Building configuration...
>
> Current configuration : 167 bytes
> !
> interface FastEthernet0/2
> description #customer: CUST01v_L2 [1M]
> switchport access vlan 340
> load-interval 30
> no cdp enable
> spanning-tree bpdufilter enable
> end
>
> And for the switchport:
>
> SWITCH#show int fa0/1 switchport
> Name: Fa0/1
> Switchport: Enabled
> Administrative Mode: dynamic desirable
> Operational Mode: static access
> Administrative Trunking Encapsulation: dot1q
> Operational Trunking Encapsulation: native
> Negotiation of Trunking: On
> Access Mode VLAN: 115 (CUST01i)
> Trunking Native Mode VLAN: 1 (default)
> Voice VLAN: none
> Administrative private-vlan host-association: none
> Administrative private-vlan mapping: none
> Administrative private-vlan trunk native VLAN: none
> Administrative private-vlan trunk encapsulation: dot1q
> Administrative private-vlan trunk normal VLANs: none
> Administrative private-vlan trunk private VLANs: none
> Operational private-vlan: none
> Trunking VLANs Enabled: ALL
> Pruning VLANs Enabled: 2-1001
> Capture Mode Disabled
> Capture VLANs Allowed: ALL
> Protected: false
> Appliance trust: none
>
> SWITCH #show int fa0/2 switchport
> Name: Fa0/2
> Switchport: Enabled
> Administrative Mode: dynamic desirable
> Operational Mode: static access
> Administrative Trunking Encapsulation: dot1q
> Operational Trunking Encapsulation: native
> Negotiation of Trunking: On
> Access Mode VLAN: 340 (#mgt/voice)
> Trunking Native Mode VLAN: 1 (default)
> Voice VLAN: none
> Administrative private-vlan host-association: none
> Administrative private-vlan mapping: none
> Administrative private-vlan trunk native VLAN: none
> Administrative private-vlan trunk encapsulation: dot1q
> Administrative private-vlan trunk normal VLANs: none
> Administrative private-vlan trunk private VLANs: none
> Operational private-vlan: none
> Trunking VLANs Enabled: ALL
> Pruning VLANs Enabled: 2-1001
> Capture Mode Disabled
> Capture VLANs Allowed: ALL
> Protected: false
> Appliance trust: none
>
>
> -----Original Message-----
> From: Christian Kratzer [mailto:ck-lists at cksoft.de]
> Sent: lundi 19 décembre 2011 11:56
> To: Henry-Nicolas Tourneur
> Cc: cisco-nsp at puck.nether.net
> Subject: Re: [c-nsp] Catalyst 2950 freezing
>
> Hi,
>
> On Mon, 19 Dec 2011, Henry-Nicolas Tourneur wrote:
>
>> Hi all,
>>
>>
>>
>> For one of our customer, we'v a Cisco Catalyst 2950 located in their
>> premises, through this switch we deliver an internet access as well as a
>> voice service.
>>
>> The switch has a really basic cfg: 3 ports connected, 1 trunk and 1 port
> per
>> service.
>>
>>
>>
>> From time to time, the switch freezes completely (all services down,
> switch
>> unreachable).
>>
>> Obviously, we already swapped the switch several times, check the logs,
>> errors counters . and nothing solved our issue.
>>
>>
>>
>> Even more weird, this morning we saw a traffic spike at 50mbps (services
> are
>> 4mbps and 1mbps) on every ports while they are inside separated VLAN (so
>> even an L2 loop shouldn't do this).
>
> can you show how the customer facing ports have been configured ?
>
> Also you might want to check the output of "show interface Gi0/x switchport"
> and look for config issues in the current state of the port.
>
> Possible the customer has something strange in their network.
>
>
> <snipp/>
>
> Greetings
> Christian
>
>

-- 
Christian Kratzer                      CK Software GmbH
Email:   ck at cksoft.de                  Wildberger Weg 24/2
Phone:   +49 7032 893 997 - 0          D-71126 Gaeufelden
Fax:     +49 7032 893 997 - 9          HRB 245288, Amtsgericht Stuttgart
Web:     http://www.cksoft.de/         Geschaeftsfuehrer: Christian Kratzer