From: Brian McGahan (brian@cyscoexpert.com)
Date: Mon Dec 16 2002 - 15:13:04 GMT-3
Chris,
Check the cabling. Are you sure the trunk is actually up? Try
sending some traffic across. What version are you running? It's
possible that this is bug ID CSCdy21905, "Spanning-tree Protocol
failures in some Catalyst 3550 models".
http://www.cisco.com/warp/customer/770/fn20553.shtml
Symptom:
Spanning-tree BPDUs (802.1d and 802.1w/802.1s) are sent to the incorrect
destination MAC address. Consequently, other switches in the network
will not process the BPDUs. If the network has been designed with a
physical loop, spanning-tree will not correctly block the loop, causing
traffic levels to increase and users to not be able to send data. In
most cases, switch management will only be possible via the console port
due to looping packets.
The log might also contain %SYS-2-MALLOCFAIL messages, which indicate
that the switch is running out of I/O memory. Spanning-tree loops are
just one cause, but not the only one, of this message. Additional
testing (see Problem Identification section below) will help to confirm
that the log messages are generated due to a spanning-tree loop that
occurs as a result of this specific issue.
Conditions:
The network must be connected with a physical loop, and contain specific
Catalyst 3550 switches. The WS-C3550-24-DC-SMI and the
WS-C3550-24-FX-SMI switches are not affected.
Resolution:
Fixed in Cisco IOS software 12.1(11)EA1, available at the link below:
http://www.cisco.com/cgi-bin/tablebuild.pl/cat3550
Try upgrading to 12.1(11)EA1 and see if that helps.
HTH
Brian McGahan, CCIE #8593
Director of Design and Implementation
brian@cyscoexpert.com
CyscoExpert Corporation
Internetwork Consulting & Training
Voice: 847.674.3392
Fax: 847.674.2625
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
Of
> chrisa
> Sent: Monday, December 16, 2002 11:09 AM
> To: ccielab@groupstudy.com
> Subject: Re: spanning tree help please
>
> Sorry diagram did not come out.
>
> sw1 ------------------- :sw2
>
>
>
> sw1--------------------sw2
>
>
> isl trunk vlan 1 &100 on both connections.
>
>
> ----- Original Message -----
> From: "chrisa" <chris_atkins@blueyonder.co.uk>
> To: <ccielab@groupstudy.com>
> Sent: Monday, December 16, 2002 4:53 PM
> Subject: spanning tree help please.
>
>
> > Hi
> > I am going mad I have the following set up.
> >
> >
> >
> >
> > =20
> >
> > =20
> >
> > =20
> > =20
> > =20
> >
> > =20
> >
> > =20
> >
> >
> >
> >
> > Isl
> >
> > =20
> >
> > =20
> > Switch2=20
> > =20
> > =20
> > =20
> >
> >
> > =20
> >
> >
> >
> > =20
> > =20
> > =20
> >
> > =20
> >
> > =20
> >
> >
> >
> > There is a ISL trunk on both links but
spanning =
> > tree is not working on any vlan.
> >
> > Both 3550 are set up as below (identical results )
> >
> > On eiher switch you do not receive BPDU but do send so both become
=
> > roots.
> >
> > Am I missing something here should not one of the ports go into =
> > blocking mode for vlan 100????
> >
> >
> >
> >
> >
> > version 12.1
> > no service pad
> > service timestamps debug uptime
> > service timestamps log uptime
> > no service password-encryption
> > !
> > hostname switch1
> > !
> > !
> > ip subnet-zero
> > !
> > spanning-tree extend system-id
> > !
> > !
> > !
> > interface GigabitEthernet0/1
> > switchport trunk encapsulation isl
> > switchport mode trunk
> > no ip address
> > !
> > interface GigabitEthernet0/2
> > switchport trunk encapsulation isl
> > switchport mode trunk
> >
> >
> >
> > switch1#sh spanning-tree vlan 100=20
> >
> > VLAN100 is executing the ieee compatible Spanning Tree protocol
> > Bridge Identifier has priority 32768, sysid 100, address =
> > 000a.410b.ce80
> > 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 1 last change occurred 00:01:51 ago
> > from GigabitEthernet0/1
> > Times: hold 1, topology change 35, notification 2
> > hello 2, max age 20, forward delay 15=20
> > Timers: hello 1, topology change 0, notification 0, aging 300
> >
> > Port 1 (GigabitEthernet0/1) of VLAN100 is forwarding
> > Port path cost 4, Port priority 128, Port Identifier 128.1.
> > Designated root has priority 32868, address 000a.410b.ce80
> > Designated bridge has priority 32868, address 000a.410b.ce80
> > Designated port id is 128.1, designated path cost 0
> > Timers: message age 0, forward delay 0, hold 0
> > Number of transitions to forwarding state: 1
> > BPDU: sent 70, received 0
> >
> > Port 2 (GigabitEthernet0/2) of VLAN100 is forwarding
> > Port path cost 4, Port priority 128, Port Identifier 128.2.
> > Designated root has priority 32868, address 000a.410b.ce80
> > Designated bridge has priority 32868, address 000a.410b.ce80
> > Designated port id is 128.2, designated path cost 0
> > Timers: message age 0, forward delay 0, hold 0
> > Number of transitions to forwarding state: 1
> > BPDU: sent 70, received 0version 12.1
> >
> >
> >
> >
> >
> >
> >
> >
> > no service pad
> > service timestamps debug uptime
> > service timestamps log uptime
> > no service password-encryption
> > !
> > hostname switch2
> > !
> > !
> > ip subnet-zero
> > !
> > spanning-tree extend system-id
> > !
> > !
> > !
> > interface GigabitEthernet0/1
> > switchport trunk encapsulation isl
> > switchport mode trunk
> > no ip address
> > !
> > interface GigabitEthernet0/2
> > switchport trunk encapsulation isl
> > switchport mode trunk
> > no ip address
> >
> >
> >
> >
> >
> >
> >
> >
> >
> > VLAN100 is executing the ieee compatible Spanning Tree protocol
> > Bridge Identifier has priority 32768, sysid 100, address =
> > 000a.410b.d200
> > 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 1 last change occurred 00:06:29 ago
> > from GigabitEthernet0/1
> > Times: hold 1, topology change 35, notification 2
> > hello 2, max age 20, forward delay 15=20
> > Timers: hello 1, topology change 0, notification 0, aging 300
> > =20
> > Port 1 (GigabitEthernet0/1) of VLAN100 is forwarding
> > Port path cost 4, Port priority 128, Port Identifier 128.1.
> > Designated root has priority 32868, address 000a.410b.d200
> > Designated bridge has priority 32868, address 000a.410b.d200
> > Designated port id is 128.1, designated path cost 0
> > Timers: message age 0, forward delay 0, hold 0
> > Number of transitions to forwarding state: 1
> > BPDU: sent 209, received 0
> > =20
> > Port 2 (GigabitEthernet0/2) of VLAN100 is forwarding
> > Port path cost 4, Port priority 128, Port Identifier 128.2.
> > Designated root has priority 32868, address 000a.410b.d200
> > Designated bridge has priority 32868, address 000a.410b.d200
> > Designated port id is 128.2, designated path cost 0
> > Timers: message age 0, forward delay 0, hold 0
> > Number of transitions to forwarding state: 1
> > BPDU: sent 209, received 0
> >
> >
> >
> > =20
> >
> > =20
> >
> > [GroupStudy.com removed an attachment of type image/gif which had a
name
> of clip_image001.gif]
> > .
> .
.
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