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DuaBell
Beginner

ACI EPG's in a freeze state

Hi Everyone,

 

Below is an error message that i detected on the ACI fabric and was not very descriptive to investigate on which EPG's are in the freeze state.

I had a look on the internet and could not find much information, besides a 'show command' to check the EPG's (no name was provided in the output) on the spine switches.

 

Below is the error message:

F3696
Severity:
major
Last Transition:
2021-10-09T01:48:27.348+02:00
Lifecycle:
Raised
Affected Object:
topology/pod-1/node-301/sys/coop/inst/dom-overlay-1
Description:
7 EPs are in freeze state.
Type:
Operational
Cause:
coop-ep-dampening
Change Set:
noOfDampenedEPs (New: 7)
Created:
2021-10-09T01:46:00.778+02:00
Code:
F3696
Number of Occurrences:
1
Original Severity:
major
Previous Severity:
major
Highest Severity:
major

 

Output from the show command:

spine303# show coop internal info repo ep dampening


EP bd vnid : 16449434
EP mac : 00:1E:67:AC:04:81
num of ipv4 addresses : 1
num of ipv6 addresses : 0
Damp penalty : 4359
Damp status : FREEZE

------------------------------------------
EP bd vnid : 16154559
EP mac : 00:50:56:B1:2E:39
num of ipv4 addresses : 1
num of ipv6 addresses : 0
Damp penalty : 10300
Damp status : FREEZE

------------------------------------------
EP bd vnid : 16449434
EP mac : 00:50:56:B1:6F:7D
num of ipv4 addresses : 2
num of ipv6 addresses : 0
Damp penalty : 13056
Damp status : FREEZE

------------------------------------------
EP bd vnid : 16449434
EP mac : 00:50:56:B1:50:12
num of ipv4 addresses : 1
num of ipv6 addresses : 0
Damp penalty : 4390
Damp status : FREEZE

------------------------------------------
EP bd vnid : 16449434
EP mac : 00:50:56:99:4E:44
num of ipv4 addresses : 1
num of ipv6 addresses : 0
Damp penalty : 5309
Damp status : FREEZE

------------------------------------------

 

May anyone please advise as to why the EPG's freeze and how can i check and confirm which EPG's are in the freeze state?

2 ACCEPTED SOLUTIONS

Accepted Solutions
Sergiu.Daniluk
VIP Advocate

Most likely the EPs were flapping. Check what other faults you have related to those EPs. You should resolve that first.

 

Stay safe,

Sergiu

View solution in original post

4 REPLIES 4
Sergiu.Daniluk
VIP Advocate

Most likely the EPs were flapping. Check what other faults you have related to those EPs. You should resolve that first.

 

Stay safe,

Sergiu

View solution in original post

Hi Sergiu,

 

Thanks for your response.

 

I had a look and it is related to an issue that we are busy resolving.

My only concern was the error message; stating that the EP's are in a freeze state.

Is there any impact on the endpoints?

 

 

 

 

The effect of EP dampening is to make all leafs to ignore any updates coming from the freezed endpointes. This way, no additional COOP updates will be sent to spines and will prevent problems in COOP and/or control plane.

Basically, if there are changes to the EPs (different interface, different MAC_IP mapping) the fabric will not be informed about it, and it will keep the previous known state.

If this will create a problem or not in the fabric, it all depends on what is generating the EPs to freeze.

 

Stay safe,

Sergiu