Re: Spanning Tree: %SW_MATM-4-MACFLAP_NOTIF

configs are off of internetworkexpert vol 2 (below)
Rack1SW1(config-if-range)#do sh run

spanning-tree mode pvst
spanning-tree etherchannel guard misconfig
spanning-tree extend system-id
!
interface FastEthernet0/13
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 46
 switchport mode trunk
!
interface FastEthernet0/15
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 46
 switchport mode trunk

-------------------

 Rack1SW2(config-if-range)#do sh run
!
spanning-tree mode pvst
spanning-tree etherchannel guard misconfig
spanning-tree extend system-id
!
interface FastEthernet0/13
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 46
 switchport mode trunk
!
interface FastEthernet0/15
 switchport trunk encapsulation dot1q
 switchport trunk native vlan 46
 switchport mode trunk

On Mon, Apr 27, 2009 at 11:13 PM, nAyYAR <nyrhh_at_hotmail.co.uk> wrote:

> Hi Kevin,
>
> can you post port and global spanning-tree configs on both sides?
> In my opinion this would be issue that needs to be fixed b4 moving on.
>
> --------------------------------------------------
> From: "kevin dalby" <ccieconsult_at_gmail.com>
> Sent: Tuesday, April 28, 2009 5:37 AM
> To: <ccielab_at_groupstudy.com>
> Subject: Spanning Tree: %SW_MATM-4-MACFLAP_NOTIF
>
> Hello All,
>>
>> I'm seeing the MACFLAP_NOTIF errors when I change my native vlan to 46
>> after
>> I trunk two ports together. If I put these back to vlan 1 the errors
>> stop.
>> I believe I have a spanning tree loop as both switch 1 & 2 are the roots
>> and ports 13 &15 on both switches are forwarding.
>>
>> sw1 f0/13----sw2 f0/13
>> sw1 f0/15----sw2 f0/15
>>
>> I have two questions:
>>
>> a) Why does this happen when I change the native vlan, what is it that
>> confuses spanning tree?
>> b) If I see this error on the CCIE lab and I have full connectivity should
>> I
>> try and troubleshoot or just move on to finish the lab? Will I lose
>> points
>> for this error if I have full connectivity?
>>
>> Thanks in advance
>>
>> ----Details Below
>>
>> 12:02:55: %SW_MATM-4-MACFLAP_NOTIF: Host 0010.2930.b701 in vlan 1 is
>> flapping between port Fa0/13 and port Fa0/15
>> 12:02:55: %SW_MATM-4-MACFLAP_NOTIF: Host 0007.eba9.df81 in vlan 1 is
>> flapping between port Fa0/13 and port Fa0/15
>> 12:02:55: %SW_MATM-4-MACFLAP_NOTIF: Host 0050.0f05.6a21 in vlan 1 is
>> flapping between port Fa0/13 and port Fa0/15
>> 12:02:55: %SW_MATM-4-MACFLAP_NOTIF: Host 000f.f780.eed0 in vlan 1 is
>> flapping between port Fa0/15 and port Fa0/13
>>
>> Rack1SW1(config)#do sh int trunk
>> Port Mode Encapsulation Status Native vlan
>> Fa0/13 on 802.1q trunking 46
>> Fa0/15 on 802.1q trunking 46
>>
>> -------------------------
>>
>> Rack1SW2(config-if-range)# do sh span det
>> VLAN0001 is executing the ieee compatible Spanning Tree protocol
>> Bridge Identifier has priority 32768, sysid 1, address 0014.6aa3.f880
>> Configured hello time 2, max age 20, forward delay 15
>> We are the root of the spanning tree
>> Topology change flag not set, detected flag not set
>> Number of topology changes 17 last change occurred 00:47:00 ago
>> from FastEthernet0/2
>> Times: hold 1, topology change 35, notification 2
>> hello 2, max age 20, forward delay 15
>> Timers: hello 0, topology change 0, notification 0, aging 300
>> Port 13 (FastEthernet0/13) of VLAN0001 is designated forwarding
>> Port path cost 19, Port priority 128, Port Identifier 128.13.
>> Designated root has priority 32769, address 0014.6aa3.f880
>> Designated bridge has priority 32769, address 0014.6aa3.f880
>> Designated port id is 128.13, designated path cost 0
>> Timers: message age 0, forward delay 0, hold 0
>> Number of transitions to forwarding state: 1
>> Link type is point-to-point by default
>> BPDU: sent 8162, received 71
>> Port 15 (FastEthernet0/15) of VLAN0001 is designated forwarding
>> Port path cost 19, Port priority 128, Port Identifier 128.15.
>> Designated root has priority 32769, address 0014.6aa3.f880
>> Designated bridge has priority 32769, address 0014.6aa3.f880
>> Designated port id is 128.15, designated path cost 0
>> Timers: message age 0, forward delay 0, hold 0
>> Number of transitions to forwarding state: 1
>> Link type is point-to-point by default
>> BPDU: sent 8166, received 69
>>
>> --------------------------------------------------------
>>
>> Rack1SW1(config)#do sh span det
>> VLAN0001 is executing the ieee compatible Spanning Tree protocol
>> Bridge Identifier has priority 32768, sysid 1, address 0014.f20d.7780
>> Configured hello time 2, max age 20, forward delay 15
>> We are the root of the spanning tree
>> Topology change flag not set, detected flag not set
>> Number of topology changes 24 last change occurred 00:47:10 ago
>> from FastEthernet0/3
>> Times: hold 1, topology change 35, notification 2
>> hello 2, max age 20, forward delay 15
>> Timers: hello 1, topology change 0, notification 0, aging 300
>> Port 13 (FastEthernet0/13) of VLAN0001 is designated forwarding
>> Port path cost 19, Port priority 128, Port Identifier 128.13.
>> Designated root has priority 32769, address 0014.f20d.7780
>> Designated bridge has priority 32769, address 0014.f20d.7780
>> Designated port id is 128.13, designated path cost 0
>> Timers: message age 0, forward delay 0, hold 0
>> Number of transitions to forwarding state: 1
>> Link type is point-to-point by default
>> BPDU: sent 7993, received 90
>> Port 15 (FastEthernet0/15) of VLAN0001 is designated forwarding
>> Port path cost 19, Port priority 128, Port Identifier 128.15.
>> Designated root has priority 32769, address 0014.f20d.7780
>> Designated bridge has priority 32769, address 0014.f20d.7780
>> Designated port id is 128.15, designated path cost 0
>> Timers: message age 0, forward delay 0, hold 0
>> Number of transitions to forwarding state: 2
>> Link type is point-to-point by default
>> BPDU: sent 7992, received 89
>>
>>
>> Blogs and organic groups at http://www.ccie.net
>>
>> _______________________________________________________________________
>> Subscription information may be found at:
>> http://www.groupstudy.com/list/CCIELab.html

Blogs and organic groups at http://www.ccie.net
Received on Mon Apr 27 2009 - 23:28:29 ART