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New Member

N5k and 3560 E

Attached is the topology,

3560E at distribution layer (Layer VLANs- Existing connection)

N5k at access layer (new connection),

We have a problem of network loop and packet loss.

Log from 3560E switch 1:

May 16 07:58:13.668: %SW_MATM-4-MACFLAP_NOTIF: Host 0000.c9db.1f5a in vlan 26 is flapping between port Po1 and port Po41

May 16 08:51:06.866: %SW_MATM-4-MACFLAP_NOTIF: Host 0000.c9db.1eda in vlan 26 is flapping between port Po1 and port Po41

May 16 08:57:47.368: %SW_MATM-4-MACFLAP_NOTIF: Host 0000.c9db.1eda in vlan 26 is flapping between port Po41 and port Po1

May 16 08:58:27.515: %SW_MATM-4-MACFLAP_NOTIF: Host 0000.c9db.1f5a in vlan 26 is flapping between port Po1 and port Po41

May 16 09:28:00.338: %SW_MATM-4-MACFLAP_NOTIF: Host 0000.c9db.1eda in vlan 26 is flapping between port Po41 and port Po1

May 16 09:32:10.033: %SW_MATM-4-MACFLAP_NOTIF: Host 0000.c9da.f29c in vlan 26 is flapping between port Po1 and port Po41

May 16 09:32:10.033: %SW_MATM-4-MACFLAP_NOTIF: Host 0000.c9da.f29c in vlan 26 is flapping between port Po1 and port Po41

Any suggestion is highly appreciated ?

Regards Vinayak
Everyone's tags (1)
1 ACCEPTED SOLUTION

Accepted Solutions
New Member

N5k and 3560 E

Yes, the VPC number should be unique per 3560 switch. This is because in your setup the 3560 switches are not part of a stack and are separate.

7 REPLIES
New Member

Re: N5k and 3560 E

Hi raman,

Have checked that the stp is properly working?

Sent from Cisco Technical Support iPhone App

New Member

N5k and 3560 E

APHUBN5K1# show vpc brie
Legend:
                (*) - local vPC is down, forwarding via vPC peer-link

vPC domain id                   : 13
Peer status                     : peer adjacency formed ok
vPC keep-alive status           : peer is alive
Configuration consistency status: success
Per-vlan consistency status     : success
Type-2 consistency status       : failed
Type-2 consistency reason       : QoSMgr Qos configuration incompatible
vPC role                        : primary
Number of vPCs configured       : 5
Peer Gateway                    : Enabled
Peer gateway excluded VLANs     : -
Dual-active excluded VLANs      : -
Graceful Consistency Check      : Enabled

vPC Peer-link status
---------------------------------------------------------------------
id   Port   Status Active vlans
--   ----   ------ --------------------------------------------------
1    Po51   up     1-3,8-11,13,15,20,23-27,35-39,41,45,99,200,401

vPC status
----------------------------------------------------------------------------
id     Port        Status Consistency Reason                     Active vlans
------ ----------- ------ ----------- -------------------------- -----------
41     Po41        up     success     success                    1-3,8-11,13
                                                                 ,15,20,23-2
                                                                 7,35-39,41,
                                                                 45,99,200,4
                                                                 01
100    Po100       up     success     success                    1-3,8-11,13
                                                                 ,15,20,23-2
                                                                 7,35-39,41,
                                                                 45,99,200,4
                                                                 01
110    Po110       up     success     success                    1-3,8-11,13
                                                                 ,15,20,23-2
                                                                 7,35-39,41,
                                                                 45,99,200,4
                                                                 01
120    Po120       up     success     success                    1-3,8-11,13
                                                                 ,15,20,23-2
                                                                 7,35-39,41,
                                                                 45,99,200,4
                                                                 01
130    Po130       up     success     success                    1-3,8-11,13
                                                                 ,15,20,23-2
                                                                 7,35-39,41,
                                                                 45,99,200,4
                                                                 01

Regards Vinayak
New Member

N5k and 3560 E

the vlan consistency issue is fixed now..however we continue to see the MAC flappings on 3560 E

Regards Vinayak
New Member

N5k and 3560 E

the stp works fine

Regards Vinayak
New Member

N5k and 3560 E

One question:

Should I have  a different vPC instead of having one VPC 41 clubbing all the uplinks from Nexus 5k to 350E ??

Regards Vinayak
New Member

N5k and 3560 E

Yes, the VPC number should be unique per 3560 switch. This is because in your setup the 3560 switches are not part of a stack and are separate.

New Member

Re: N5k and 3560 E

Thanks...I believe this is a reason I am seeing a bridging loop...

Sent from Cisco Technical Support iPad App

Regards Vinayak
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