05-16-2012 03:09 AM - edited 03-04-2019 04:22 PM
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 ?
Solved! Go to Solution.
05-17-2012 11:26 AM
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.
05-17-2012 05:35 AM
Hi raman,
Have checked that the stp is properly working?
Sent from Cisco Technical Support iPhone App
05-17-2012 06:29 AM
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
05-17-2012 07:11 AM
the vlan consistency issue is fixed now..however we continue to see the MAC flappings on 3560 E
05-17-2012 07:12 AM
the stp works fine
05-17-2012 07:36 AM
One question:
Should I have a different vPC instead of having one VPC 41 clubbing all the uplinks from Nexus 5k to 350E ??
05-17-2012 11:26 AM
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.
05-17-2012 11:49 AM
Thanks...I believe this is a reason I am seeing a bridging loop...
Sent from Cisco Technical Support iPad App
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