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MAC Flapping & VLAN Issues

MAC Flapping & VLAN Issues

Hi

I've got two issues

1) MAC Flapping. The MAC Addreseses seem to be coming from the stacking link of the VC modules and it shows in VLAN999 which is our dummy native vlan. Ports 12/16/20/24 on the 4 stacked Catalyst switches are what we use Shared Uplink Sets.


333808: Mar 11 12:19:39.803: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.cc91 in vlan 999 is flapping between port Po16 and port Gi2/0/12
333809: Mar 11 12:19:42.101: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.2cf7 in vlan 999 is flapping between port Gi1/0/16 and port Po12
333810: Mar 11 12:19:58.526: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.7c85 in vlan 999 is flapping between port Gi3/0/16 and port Po11
333811: Mar 11 12:20:02.343: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.bcbd in vlan 999 is flapping between port Gi4/0/16 and port Po15
333812: Mar 11 12:20:09.826: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.cc91 in vlan 999 is flapping between port Po16 and port Gi2/0/12
333813: Mar 11 12:20:12.107: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.2cf7 in vlan 999 is flapping between port Gi1/0/16 and port Po12
333814: Mar 11 12:20:28.524: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.7c85 in vlan 999 is flapping between port Gi3/0/16 and port Po11
333815: Mar 11 12:20:32.341: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.bcbd in vlan 999 is flapping between port Gi4/0/16 and port Po15
333816: Mar 11 12:20:33.129: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.2cf7 in vlan 999 is flapping between port Po12 and port Gi1/0/12
333817: Mar 11 12:20:39.823: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.cc91 in vlan 999 is flapping between port Po16 and port Gi2/0/12


2) When I use our ALL_VLAN,1,2,3,4 which carry the trunk and then the host does the tagging and try to connect to it via NAT it doesnt seem to work, yet when I used a SuS with the vlan defined it works fine. The exception to the rule is a server I use for mamangement which uses all VLANS and I can connect to it via NAT & RDP which is very odd.


Onboard Administrator 2.2
Blade iLO2’s 1.6
Virtual Connect 1.31
Blade BIOS I15 04/08/2008

2 Enclosures
4x 1/10GB VC-Enet Modules per enc (and stacking cables)
2x 4Gb VC-FC Modules per enc

BL460c blades, 4 NICS (2 Onboard 2 from Mezz),

4 x 24 port Catalyst 3750's with stacking cables.

Each VC module is plugged into the same physical switch with a 802.1Q trunk.

So for example g1/0/16 - g1/0/24 Enc 1 VC Bay 1 ports 1-8.

Ports 4 & 8 are used in the SuS and are not part of the active etherchannel we have setup for each bay.


description WF1 Bay5 Port1
switchport trunk encapsulation dot1q
switchport trunk native vlan 999
switchport mode trunk
channel-group 12 mode active
spanning-tree portfast trunk

In virtual connect we have serveral networks defined ALL_VLANS_1,2,3,4 with VLAN tunneling on.

Each network is then made up of 6 ports from a bay so ALL_VLans_1 is port 1-3 & 5-7 from Bay 1 (with the exception of bays 1 & 6 on p8 for the SuS)

The SuS have all our vlans defined except the native vlan.

Could anyone shed some light on my two above questions?

Is it possible to export my config out of VC to explain this better?

Doug
2 REPLIES

Re: MAC Flapping & VLAN Issues

I was thinking this could be because the SuS ports are not in an etherchannel on the cisco switch?

Re: MAC Flapping & VLAN Issues

Well I put the SuS ports in an ether channel and still getting this issue.

I also upgraded to the latest build of OA/VC firmware available on the HP site.

Anyone have any clues?

Thanks

Doug

1130443: May 21 14:32:53.177: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.9c89 in vlan 999 is flapping between port Po34 and port Po14
1130444: May 21 14:32:58.269: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.dc27 in vlan 999 is flapping between port Po33 and port Po13
1130445: May 21 14:33:04.485: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.2cf7 in vlan 999 is flapping between port Po32 and port Po12
1130446: May 21 14:33:05.550: %SW_MATM-4-MACFLAP_NOTIF: Host 0018.fe82.8f2d in vlan 999 is flapping between port Po37 and port Po17
1130447: May 21 14:33:06.263: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.bcbd in vlan 999 is flapping between port Po35 and port Po15
1130448: May 21 14:33:21.908: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.cc91 in vlan 999 is flapping between port Po36 and port Po16
1130449: May 21 14:33:22.780: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.dc0b in vlan 999 is flapping between port Po30 and port Po10
1130450: May 21 14:33:23.166: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.9c89 in vlan 999 is flapping between port Po34 and port Po14
1130451: May 21 14:33:28.258: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.dc27 in vlan 999 is flapping between port Po33 and port Po13
1130452: May 21 14:33:34.474: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.2cf7 in vlan 999 is flapping between port Po32 and port Po12
1130453: May 21 14:33:35.556: %SW_MATM-4-MACFLAP_NOTIF: Host 0018.fe82.8f2d in vlan 999 is flapping between port Po37 and port Po17
1130454: May 21 14:33:36.253: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.bcbd in vlan 999 is flapping between port Po35 and port Po15
1130455: May 21 14:33:51.881: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.cc91 in vlan 999 is flapping between port Po36 and port Po16
1130456: May 21 14:33:52.787: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.dc0b in vlan 999 is flapping between port Po30 and port Po10
1130457: May 21 14:33:53.181: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.9c89 in vlan 999 is flapping between port Po34 and port Po14
1130458: May 21 14:33:58.256: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.dc27 in vlan 999 is flapping between port Po33 and port Po13
1130459: May 21 14:34:05.571: %SW_MATM-4-MACFLAP_NOTIF: Host 0018.fe82.8f2d in vlan 999 is flapping between port Po37 and port Po17
1130460: May 21 14:34:06.250: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.bcbd in vlan 999 is flapping between port Po35 and port Po15
1130461: May 21 14:34:08.482: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.2cf7 in vlan 999 is flapping between port Po12 and port Po32
1130462: May 21 14:34:21.903: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.cc91 in vlan 999 is flapping between port Po36 and port Po16
1130463: May 21 14:34:22.776: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.dc0b in vlan 999 is flapping between port Po30 and port Po10
1130464: May 21 14:34:23.178: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.9c89 in vlan 999 is flapping between port Po34 and port Po14
1130465: May 21 14:34:28.270: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.dc27 in vlan 999 is flapping between port Po33 and port Po13
1130466: May 21 14:34:35.568: %SW_MATM-4-MACFLAP_NOTIF: Host 0018.fe82.8f2d in vlan 999 is flapping between port Po37 and port Po17
1130467: May 21 14:34:36.248: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.bcbd in vlan 999 is flapping between port Po35 and port Po15
1130468: May 21 14:34:38.479: %SW_MATM-4-MACFLAP_NOTIF: Host 001b.786d.2cf7 in vlan 999 is flapping between port Po12 and port Po32