11-19-2013 08:48 AM - edited 03-07-2019 04:40 PM
Referencing to this doc:
https://supportforums.cisco.com/docs/DOC-16177
which was very helpful, I noticed that I'm getting this error message:
%SW_MATM-4-MACFLAP_NOTIF: Host d067.e5cc.2e49 in vlan 1 is flapping between port Po11 and port Po12
I have Dell PC6248 connected to C3560 with two port channels. In fact, I have two Dell switches in a stack. As document describes, I configured MST on both switches and that resolved slow convergence of network, but above message now appears.
That MAC address is no host:
Cisco switch | Dell switch |
---|---|
Cisco switch: Router_Switch#sh mac address-table Mac Address Table ------------------------------------------- Vlan Mac Address Type Ports ---- ----------- -------- ----- All 0100.0ccc.cccc STATIC CPU All 0100.0ccc.cccd STATIC CPU All 0180.c200.0000 STATIC CPU All 0180.c200.0001 STATIC CPU All 0180.c200.0002 STATIC CPU All 0180.c200.0003 STATIC CPU All 0180.c200.0004 STATIC CPU All 0180.c200.0005 STATIC CPU All 0180.c200.0006 STATIC CPU All 0180.c200.0007 STATIC CPU All 0180.c200.0008 STATIC CPU All 0180.c200.0009 STATIC CPU All 0180.c200.000a STATIC CPU All 0180.c200.000b STATIC CPU All 0180.c200.000c STATIC CPU All 0180.c200.000d STATIC CPU All 0180.c200.000e STATIC CPU All 0180.c200.000f STATIC CPU All 0180.c200.0010 STATIC CPU All ffff.ffff.ffff STATIC CPU 1 d067.e5cc.2e49 DYNAMIC Po11 255 d067.e5cc.2e47 DYNAMIC Po11 Total Mac Addresses for this criterion: 22 | WSS_Dell_PC6248#show bridge address-table Aging time is 300 Sec Vlan Mac Address Port Type -------- --------------------- ---------- -------------------- 1 04C5.A464.301F ch1 Dynamic 1 04C5.A464.3025 ch2 Dynamic 1 04C5.A464.3028 ch1 Dynamic 255 04C5.A464.3045 ch1 Dynamic 255 D067.E5CC.2E47 cpu Management Total MAC Addresses in use:5 |
VLAN 255 is mgmt vlan. I didn't get that message before using mst.
Configuration of trunk ports on Dell:
!
interface port-channel 1
description 'TRUNK_3560_1'
switchport mode general
switchport general allowed vlan add 10,255 tagged
exit
!
What seems to be the problem here?
Solved! Go to Solution.
11-20-2013 01:27 AM
Cisco
##### MST0 vlans mapped: 1-4094
Dell
###### MST 0 Vlan Mapped: 1, 10, 20, 255
MSTP BPDUs contain a digest of the VLANs-to-instance mapping table and this digests have to match on all switches within the Region (in addition with the revision number and the name). You can check the digest on the Cisco switch with "show spanning-tree mst configuration digest", I guess there is also a command to show it available for the Dell.
I'm not sure if this is really an issue in your scenario because the Dell has accepted the Cisco as the root bridge.
[]EDIT:
WSS_Dell_PC6248#show spanning-tree mst-configuration
Name: D0-67-E5-CC-2E-47
Revision: 0
Names and Revisions also have to match.
HTH
Rolf
11-19-2013 12:59 PM
show spanning-tree mst 0
show etherchannel summary
Check the same on Dell side.
Check the port channel cabling to make sure the member links form the same pairs on both sides.
11-20-2013 12:59 AM
CISCO 3560:
Router_Switch#show spanning-tree mst 0
##### MST0 vlans mapped: 1-4094
Bridge address 04c5.a464.3000 priority 32768 (32768 sysid 0)
Root this switch for the CIST
Operational hello time 2 , forward delay 15, max age 20, txholdcount 6
Configured hello time 2 , forward delay 15, max age 20, max hops 20
Interface Role Sts Cost Prio.Nbr Type
---------------- ---- --- --------- -------- --------------------------------
Fa0/25 Desg FWD 200000 128.29 P2p
Po11 Desg FWD 100000 128.136 P2p
Po12 Desg FWD 100000 128.144 P2p
Router_Switch#show etherchannel summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator
M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port
Number of channel-groups in use: 2
Number of aggregators: 2
Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
11 Po11(SU) - Fa0/33(P) Fa0/35(P)
12 Po12(SU) - Fa0/27(P) Fa0/36(P)
-------------------------------------------------------------------------------------------------------------------------------------------------
DELL:
WSS_Dell_PC6248#show interfaces port-channel
Channel Ports Hash Algorithm Type
------- ----------------------------- -------------------
ch1 Active: 1/g48, 2/g48 3
ch2 Active: 1/g47, 2/g47 3
(output omited)
WSS_Dell_PC6248#show spanning-tree mst-configuration
Name: D0-67-E5-CC-2E-47
Revision: 0
Instance Vlan Mapped
---------- -----------------------------------------------
0 1, 10, 20, 255
WSS_Dell_PC6248#show spanning-tree
Spanning tree Enabled BPDU flooding Disabled Portfast BPDU filtering Disabled mode mstp
CST Regional Root: A0:00:D0:67:E5:CC:2E:47
Regional Root Path Cost: 0
###### MST 0 Vlan Mapped: 1, 10, 20, 255
ROOT ID
Address 04:C5:A4:64:30:00
Path Cost 100000
Root Port ch2
Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec
Bridge ID
Priority 40960
Address D0:67:E5:CC:2E:47
Hello Time 2 Sec Max Age 20 sec Forward Delay 15 sec TxHoldCount 6 sec
(output omited)
1/g47 Enabled 128.47 0 FWD Disb No No
1/g48 Enabled 128.48 0 FWD Disb No No
(output omited)
ch1 Enabled 96.626 100000 DSC Altn No No
ch2 Enabled 96.627 100000 FWD Root No No
(output omited)
11-20-2013 01:27 AM
Cisco
##### MST0 vlans mapped: 1-4094
Dell
###### MST 0 Vlan Mapped: 1, 10, 20, 255
MSTP BPDUs contain a digest of the VLANs-to-instance mapping table and this digests have to match on all switches within the Region (in addition with the revision number and the name). You can check the digest on the Cisco switch with "show spanning-tree mst configuration digest", I guess there is also a command to show it available for the Dell.
I'm not sure if this is really an issue in your scenario because the Dell has accepted the Cisco as the root bridge.
[]EDIT:
WSS_Dell_PC6248#show spanning-tree mst-configuration
Name: D0-67-E5-CC-2E-47
Revision: 0
Names and Revisions also have to match.
HTH
Rolf
11-20-2013 02:14 AM
Today I started scenario again and it didn't show the flapping message and I even didn't configure mst instances to be same on both switches. However, just in case I will configure instances to be equal on both sides. Thanks.
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