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Link flapping/down issue with Nexus 7K
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04-12-2014 04:41 AM - edited 03-07-2019 07:04 PM
Hi , We have a pair of nexus 7K in VPC environment. From past few days it has been noticed that randomly any interface on any 7K goes down . To recover the same we do shut & no shut the interface which brings it back.
Would like to know if some one has experienced the same issue or is there any preventive measures to keep this away in future .
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04-12-2014 10:57 AM
Hi,
Is STP configured correctly with primary VPC being root and the backup device being backup root?
also, what does the log show when this happens?
Can you post VPC and VPC peer link config from both switch?
What is the output of "sh vpc"?
What version of Nexus-OS are you running?
HTH
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04-13-2014 11:50 PM
Hi ,
We get normal link down alerts when interface goes down.
Below are required output .
## Primary Config #######
Switch is in rapid-pvst mode
Root bridge for: VLAN0010, VLAN0020, VLAN0040
Port Type Default is edge
Edge Port [PortFast] BPDU Guard Default is enabled
Edge Port [PortFast] BPDU Filter Default is enabled
Bridge Assurance is enabled
Loopguard Default is enabled
Pathcost method used is short
STP-Lite is enabled
Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0001 0 0 0 134 134
VLAN0010 0 0 0 5 5
VLAN0020 0 0 0 4 4
VLAN0030 0 0 0 10 10
VLAN0040 0 0 0 4 4
VLAN0104 0 0 0 5 5
---------------------- -------- --------- -------- ---------- ----------
6 vlans 0 0 0 162 162
show vp[Jc
Legend:
(*) - local vPC is down, forwarding via vPC peer-link
vPC domain id : 1
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 : success
vPC role : secondary, operational primary
Number of vPCs configured : 74
Peer Gateway : Disabled
Dual-active excluded VLANs : -
Graceful Consistency Check : Enabled
Auto-recovery status : Enabled (timeout = 240 seconds)
vPC Peer-link status
---------------------------------------------------------------------
id Port Status Active vlans
-- ---- ------ --------------------------------------------------
1 Po1 up 1,10,20,30,40,104
vPC status
----------------------------------------------------------------------
id Port Status Consistency Reason Active vlans
-- ---- ------ ----------- ------ ------------
8 Po8 up success success 1
9 Po9 up success success 1
10 Po10 up success success 1,10,30
11 Po11 up success success 1,10,20,30,
40,104
17 Po17 up success success 1
21 Po21 down* success success -
22 Po22 up success success 1
28 Po28 up success success 1
29 Po29 up success success 1
30 Po30 up success success 1
31 Po31 up success success 1
32 Po32 up success success 1
33 Po33 up success success 1
35 Po35 up success success 1
36 Po36 up success success 1
37 Po37 up success success 1
38 Po38 down* success success -
39 Po39 up success success 1
interface port-channel1
description ***Connected to Secondary NEXUS SW2 port-channel 1***
switchport mode trunk
spanning-tree port type network
vpc peer-link
kickstart image file is: bootflash:///n7000-s1-kickstart.6.1.4.bin
kickstart compile time: 12/25/2020 12:00:00 [05/16/2013 07:14:08]
system image file is: bootflash:///n7000-s1-dk9.6.1.4.bin
system compile time: 3/11/2013 23:00:00 [05/16/2013 08:21:50]
###### Secondary config ###########
show spanning-tree sum[Jmary
Switch is in rapid-pvst mode
Root bridge for: none
Port Type Default is edge
Edge Port [PortFast] BPDU Guard Default is enabled
Edge Port [PortFast] BPDU Filter Default is enabled
Bridge Assurance is enabled
Loopguard Default is enabled
Pathcost method used is short
STP-Lite is enabled
Name Blocking Listening Learning Forwarding STP Active
---------------------- -------- --------- -------- ---------- ----------
VLAN0001 0 0 0 127 127
VLAN0010 0 0 0 5 5
VLAN0020 0 0 0 4 4
VLAN0030 0 0 0 15 15
VLAN0040 0 0 0 7 7
VLAN0104 0 0 0 5 5
---------------------- -------- --------- -------- ---------- ----------
6 vlans 0 0 0 163 163
sho[Jw vpc
Legend:
(*) - local vPC is down, forwarding via vPC peer-link
vPC domain id : 1
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 : success
vPC role : primary, operational secondary
Number of vPCs configured : 74
Peer Gateway : Disabled
Dual-active excluded VLANs : -
Graceful Consistency Check : Enabled
Auto-recovery status : Enabled (timeout = 240 seconds)
vPC Peer-link status
---------------------------------------------------------------------
id Port Status Active vlans
-- ---- ------ --------------------------------------------------
1 Po1 up 1,10,20,30,40,104
vPC status
----------------------------------------------------------------------
id Port Status Consistency Reason Active vlans
-- ---- ------ ----------- ------ ------------
8 Po8 up success success 1
9 Po9 up success success 1
10 Po10 up success success 1,10,30
11 Po11 up success success 1,10,20,30,
40,104
17 Po17 up success success 1
21 Po21 down* success success -
22 Po22 up success success 1
28 Po28 up success success 1
29 Po29 down* Not Consistency Check Not -
Applicable Performed
30 Po30 up success success 1
31 Po31 up success success 1
32 Po32 up success success 1
33 Po33 up success success 1
35 Po35 up success success 1
36 Po36 up success success 1
37 Po37 up success success 1
38 Po38 down* success success -
39 Po39 up success success 1
42 Po42 down* Not Consistency Check Not -
Applicable Performed
43 Po43 down* Not Consistency Check Not -
Applicable Performed
44 Po44 down* Not Consistency Check Not -
Applicable Performed
interface port-channel1
description ***Connected to Primary NEXUS SW1 port-channel 1***
switchport mode trunk
spanning-tree port type network
vpc peer-link
kickstart image file is: bootflash:///n7000-s1-kickstart.6.1.4.bin
kickstart compile time: 12/25/2020 12:00:00 [05/16/2013 07:14:08]
system image file is: bootflash:///n7000-s1-dk9.6.1.4.bin
system compile time: 3/11/2013 23:00:00 [05/16/2013 08:21:50]
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