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N5k and 3560 E

Vinayaka Raman
Level 1
Level 1

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
1 Accepted Solution

Accepted Solutions

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.

View solution in original post

7 Replies 7

evergreenajay
Level 1
Level 1

Hi raman,

Have checked that the stp is properly working?

Sent from Cisco Technical Support iPhone App

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

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

Regards Vinayak

the stp works fine

Regards Vinayak

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

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.

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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