Re: Spanning Tree: %SW_MATM-4-MACFLAP_NOTIF

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
>
>
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Received on Tue Apr 28 2009 - 06:13:39 ART