[c-nsp] Mac address flapping..
Jeff Crowe
listacct at genhex.net
Fri Jul 10 14:02:17 EDT 2009
Hi James,
I have actually recently created this situation when I setup a 2651 router
to bridge vlan's. Our provider delivers vlans a,b,c,d,e on a trunk port
that I put through a router configured for irb, this caused the mac's on any
vlan to start jumping around on interfaces on their network.
Hope this helps find the cause.
Regards,
Jeff.
-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of James Ashton
Sent: Friday, July 10, 2009 1:48 PM
To: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] Mac address flapping..
Alan,
Po1 is the connection from 6509-a to 6509-b.
G1/7 goes to port G1/1 on 4506-a.
G1/8 goes to G1/1 on 4506-b.
As for them creating a loop locally, If I disable one of the ports facing
them, the errors persist. Them having a loop in their switch, if it only
has a single connection to my network, shouldn't effect me. Unless I am
missing something..
Could their configuration actually effect my spanning tree if I am only
running one link to them??
James
-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of James Ashton
Sent: Friday, July 10, 2009 11:57 AM
To: cisco-nsp at puck.nether.net
Subject: [c-nsp] Mac address flapping..
Hello all.
I am seeing a log of Mac_Move log entries for one vlan on my 6509s. (I have
a pair doing redundant gateways for a DataCenter network)
%MAC_MOVE-SP-4-NOTIF: Host 00d0.009e.2400 in vlan 42 is flapping
between port Po1 and port Gi1/7
I see about 20 of these for this one vlan each minute.
Spanning tree is not reconverging. It hasn't had a topology change in over
48 hours.
HSRP has not changed state.
I have over 120 vlans set up in this exact manor and this is the only one
going this.
I have default timers set on HSRP and Spanning tree.
Gateways are all on SVIs.
Trunks between the 6509s and then a full mesh out to a pair of 4506s doing
customer distro.
The above log entries are the only ones I am seeing from all 4 devices.
And they are only coming from 6509-a
I am running out of ideas as to the cause. If I disconnect the customer
from 4506-b or -a so they only have one link and are no longer part of
spanning tree. It doesn't stop. So I assume that their switch is not the
cause.
Any thoughts??
=================================================
The vlan interface config is:
interface Vlan42
description Customer1
ip address xxx.xxx.xxx.xxx 255.255.255.224 secondary
ip address xxx.xxx.xxx.xxx 255.255.255.224
no ip redirects
no ip unreachables
no ip proxy-arp
standby 42 ip xxx.xxx.xxx.xxx
standby 42 ip xxx.xxx.xxx.xxx secondary
standby 42 priority 110
standby 42 preempt
On the second 6509 the config is:
interface Vlan42
description Customer1
ip address xxx.xxx.xxx.xxx 255.255.255.224 secondary
ip address xxx.xxx.xxx.xxx 255.255.255.224
no ip redirects
no ip unreachables
no ip proxy-arp
standby 42 ip xxx.xxx.xxx.xxx
standby 42 ip xxx.xxx.xxx.xxx secondary
standby 42 preempt
6509-a:
VLAN0042
Spanning tree enabled protocol ieee
Root ID Priority 24618
Address 00d0.00a7.f000
This bridge is the root
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 24618 (priority 24576 sys-id-ext 42)
Address 00d0.00a7.f000
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Gi1/7 Desg FWD 4 128.7 P2p
Gi1/8 Desg FWD 4 128.8 P2p
Po1 Desg FWD 3 128.1665 P2p
6509-b:
VLAN0042
Spanning tree enabled protocol ieee
Root ID Priority 24618
Address 00d0.00a7.f000
Cost 3
Port 1665 (Port-channel1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 28714 (priority 28672 sys-id-ext 42)
Address 00d0.009e.2400
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Gi1/7 Desg FWD 4 128.7 P2p
Gi1/8 Desg FWD 4 128.8 P2p
Po1 Root FWD 3 128.1665 P2p
4506-a:
VLAN0042
Spanning tree enabled protocol ieee
Root ID Priority 24618
Address 00d0.00a7.f000
Cost 3004
Port 1 (GigabitEthernet1/1)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 49194 (priority 49152 sys-id-ext 42)
Address 0013.c405.7dc0
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Uplinkfast enabled
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Gi1/1 Root FWD 3004 128.1 P2p
Gi1/2 Altn BLK 3004 128.2 P2p
Fa3/25 Desg FWD 3019 128.153 P2p
4506-b:
VLAN0042
Spanning tree enabled protocol ieee
Root ID Priority 24618
Address 00d0.00a7.f000
Cost 3004
Port 2 (GigabitEthernet1/2)
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Bridge ID Priority 49194 (priority 49152 sys-id-ext 42)
Address 0014.6aed.3b80
Hello Time 2 sec Max Age 20 sec Forward Delay 15 sec
Aging Time 300
Uplinkfast enabled
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- --------
--------------------------------
Gi1/1 Altn BLK 3004 128.1 P2p
Gi1/2 Root FWD 3004 128.2 P2p
Fa3/25 Desg FWD 3019 128.153 P2p
James P. Ashton
Sr. Network Engineer
E Solutions Corporation
813.301.2642 Direct
813.301.2600 Main
813.301.2699 Fax
813.301.2620 Support
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