From: George Goglidze (goglidze@gmail.com)
Date: Sat Dec 15 2007 - 07:54:08 ART
Hello Patrick,
Do you have the same problem?
the IOS is: c3725-adventerprisek9-mz.124-17.bin
Regards,
On Dec 14, 2007 9:55 PM, Laidlaw, Patrick A. <Patrick.Laidlaw@wwt.com>
wrote:
> Which IOS version are you usering for the 3725? Could you send the
> binary name?
>
> Patrick Laidlaw
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> George Goglidze
> Sent: Friday, December 14, 2007 11:21 AM
> To: Cisco certification
> Subject: Re: SPT flapping
>
> Hi all,
>
> If someone is interested, I've solved it.
> By just changing the router version and IOS on dynamips.
> before I had 3640 now I have 3725 with 16ESW module.
>
> With the same config, I have no errors.
>
> Thanks,
>
>
> On Dec 12, 2007 5:38 PM, George Goglidze <goglidze@gmail.com> wrote:
>
> > Hello group,
> >
> > I'm trying to resolve this problem for couple hours already, and
> > cannot find anything that could help.
> >
> > let me describe my lab first:
> >
> > I've got two 3550's which I've connected to my PC.
> > on ubuntu with br interfaces I bridge physical interface and tap
> > interface.
> >
> > now in dynamips I create another 2 switches(NM-16ESW), and I connect
> > switches all together.
> > (dynamips)SW1 F0/1 -> (dynamips) SW2 f0/1 <<<---trunk
> > (dynamips)SW1 F0/3 -> (REAL) SW3 f0/3 <<<---trunk
> > (dynamips)SW1 F0/15 -> (REAL) SW4 f0/21 <<<---trunk
> >
> > (dynamips)SW2 F0/1 -> (dynamips) SW1 f0/1 <<<---trunk
> > (dynamips)SW2 F0/3 -> (REAL) SW4 f0/3 <<<---trunk
> > (dynamips)SW2 F0/15 -> (REAL) SW3 f0/21 <<<---trunk
> >
> > (REAL)SW3 F0/3 -> (dynamips) SW1 F0/3
> > (REAL)SW3 (f0/11,f0/12,f0/13) Po1 -> (REAL) SW4 (f0/11,f0/12,f0/13)
> > Po1
> > (REAL)SW3 F0/21 -> (dynamips) SW2 F0/15
> >
> > (REAL)SW4 F0/3 -> (dynamips) SW2 F0/3
> > (REAL)SW4 (f0/11,f0/12,f0/13) Po1 -> (REAL) SW3 (f0/11,f0/12,f0/13)
> > Po1
> > (REAL)SW4 F0/21 -> (dynamips) SW1 F0/15
> >
> > ---------------------------------
> >
> > Ok, I hope the physical config is clear.
> >
> > I've got many NIC's in computer and each of them bridged to particular
>
> > TAP interface which is linked to dynamips appropriate routers.
> >
> > now the configs:
> >
> > SW1:
> >
> > spanning-tree vlan 10 priority 4096
> > spanning-tree vlan 20 priority 4096
> > spanning-tree vlan 30 priority 4096
> > spanning-tree vlan 40 priority 4096
> > spanning-tree vlan 55 priority 4096
> > spanning-tree vlan 60 priority 4096
> > spanning-tree vlan 100 priority 4096
> > !
> > interface FastEthernet1/0
> > switchport mode trunk
> > !
> > interface FastEthernet1/3
> > switchport mode trunk
> > !
> > interface FastEthernet1/15
> > switchport mode trunk
> > !
> >
> >
> > SW2:
> >
> > !
> > interface FastEthernet1/0
> > switchport mode trunk
> > !
> > interface FastEthernet1/3
> > switchport mode trunk
> > !
> > interface FastEthernet1/15
> > switchport mode trunk
> > !
> >
> >
> > SW3:
> >
> > spanning-tree mode pvst
> > spanning-tree extend system-id
> > spanning-tree vlan 1 priority 4096
> > !
> > !
> > interface Port-channel1
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > !
> > interface FastEthernet0/3
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > !
> > interface FastEthernet0/11
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > channel-group 1 mode desirable
> > !
> > interface FastEthernet0/12
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > channel-group 1 mode desirable
> > !
> > interface FastEthernet0/13
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > channel-group 1 mode desirable
> > !
> > interface FastEthernet0/21
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > !
> >
> >
> > ----------------
> >
> > SW4:
> >
> >
> > spanning-tree mode pvst
> > spanning-tree extend system-id
> > spanning-tree vlan 70 priority 4096
> > !
> > interface Port-channel1
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > !
> > interface FastEthernet0/3
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > !
> > interface FastEthernet0/11
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > channel-group 1 mode desirable
> > !
> > interface FastEthernet0/12
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > channel-group 1 mode desirable
> > !
> > interface FastEthernet0/13
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > channel-group 1 mode desirable
> > !
> > interface FastEthernet0/21
> > switchport trunk encapsulation dot1q
> > switchport mode trunk
> > !
> >
> >
> > ----------------------------------------------------------------------
> > ---------------------------------
> >
> >
> > now the problem:
> >
> > on sw4 I've got
> > debug spanning-tree events
> >
> > and the output is:
> >
> >
> > 02:35:58: STP: VLAN0040 new root port Po1, cost 28
> > 02:35:58: STP: VLAN0040 Po1 -> listening SW4#
> > 02:36:02: STP: VLAN0040 new root port Fa0/21, cost 19
> > 02:36:02: STP: VLAN0040 Po1 -> blocking SW4#
> > 02:36:15: STP: VLAN0055 new root port Po1, cost 28
> > 02:36:15: STP: VLAN0055 Po1 -> listening SW4#
> > 02:36:18: STP: VLAN0055 new root port Fa0/21, cost 19
> > 02:36:18: STP: VLAN0055 Po1 -> blocking SW4#
> > 02:36:22: STP: VLAN0020 new root port Po1, cost 28
> > 02:36:22: STP: VLAN0020 Po1 -> listening SW4#
> > 02:36:23: STP: VLAN0040 new root port Po1, cost 28
> > 02:36:23: STP: VLAN0040 Po1 -> listening SW4#
> > 02:36:25: STP: VLAN0020 new root port Fa0/21, cost 19
> > 02:36:25: STP: VLAN0020 Po1 -> blocking
> > 02:36:25: STP: VLAN0040 new root port Fa0/21, cost 19
> > 02:36:25: STP: VLAN0040 Po1 -> blocking SW4#
> > 02:36:45: STP: VLAN0100 Po1 -> listening
> > 02:36:46: STP: VLAN0100 new root port Fa0/3, cost 38
> > 02:36:46: STP: VLAN0100 Fa0/3 -> listening SW4#
> > 02:36:46: STP: VLAN0100 new root port Po1, cost 28
> > 02:36:46: STP: VLAN0100 Fa0/3 -> blocking
> > 02:36:46: STP: VLAN0100 new root port Fa0/21, cost 19
> > 02:36:46: STP: VLAN0100 Po1 -> blocking SW4#
> > 02:37:04: STP: VLAN0020 new root port Po1, cost 28
> > 02:37:04: STP: VLAN0020 Po1 -> listening SW4#
> > 02:37:09: STP: VLAN0020 new root port Fa0/21, cost 19
> > 02:37:09: STP: VLAN0020 Po1 -> blocking SW4#
> > 02:37:29: STP: VLAN0020 new root port Po1, cost 28
> > 02:37:29: STP: VLAN0020 Po1 -> listening
> >
> >
> >
> > on sw3 the same:
> >
> > 02:30:56: STP: VLAN0100 Fa0/21 -> blocking
> > 02:31:02: STP: VLAN0030 we are the spanning tree root
> > 02:31:02: STP: VLAN0030 heard root 4096-cc01.1abe.0003 on Fa0/3
> > 02:31:02: supersedes 32798-0013.7ff5.f280
> > 02:31:02: STP: VLAN0030 new root is 4096, cc01.1abe.0003 on port
> > Fa0/3, cost 19
> > 02:31:02: STP: VLAN0030 sent Topology Change Notice on Fa0/3
> > 02:31:02: STP: VLAN0030 Fa0/21 -> blocking
> > 02:31:11: STP: VLAN0055 new root port Fa0/21, cost 38
> > 02:31:11: STP: VLAN0055 Fa0/21 -> listening
> > 02:31:13: STP: VLAN0055 new root port Fa0/3, cost 19
> > 02:31:13: STP: VLAN0055 Fa0/21 -> blocking
> > 02:31:20: STP: VLAN0030 Fa0/21 -> listening
> > 02:31:26: STP: VLAN0030 Fa0/21 -> blocking
> > 02:31:27: STP: VLAN0020 new root port Fa0/21, cost 38
> > 02:31:27: STP: VLAN0020 Fa0/21 -> listening
> > 02:31:29: STP: VLAN0020 new root port Fa0/3, cost 19
> > 02:31:29: STP: VLAN0020 Fa0/21 -> blocking
> > 02:31:31: STP: VLAN0100 new root port Fa0/21, cost 38
> > 02:31:31: STP: VLAN0100 Fa0/21 -> listening
> > 02:31:32: STP: VLAN0100 new root port Fa0/3, cost 19
> > 02:31:32: STP: VLAN0100 Fa0/21 -> blocking
> > 02:32:09: STP: VLAN0055 new root port Fa0/21, cost 38
> > 02:32:09: STP: VLAN0055 Fa0/21 -> listening
> > 02:32:09: STP: VLAN0055 new root port Fa0/3, cost 19
> > 02:32:09: STP: VLAN0055 Fa0/21 -> blocking
> > 02:33:01: STP: VLAN0100 new root port Fa0/21, cost 38
> > 02:33:01: STP: VLAN0100 Fa0/21 -> listening
> > 02:33:01: STP: VLAN0100 new root port Fa0/3, cost 19
> > 02:33:01: STP: VLAN0100 Fa0/21 -> blocking
> >
> >
> > ----------------------------------------------------------------
> >
> >
> > I think for some reason real switches stop receiving BPDU's but why
> > could that be?
> > has anyone experienced that kind of behavior?
> >
> > P.S. by the way the brctl is configured without STP it just forwards
> > all traffic.
>
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