FIX ASIC_STATE:SAI_OBJECT_TYPE_FDB_ENTRY key unavailable in database #3868
Conversation
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
When excessive MAC addresses are learned and MAC ageout occurs, pre-fetched keys may become out of sync with the actual state.
What I did
1. disable blocking , do not repeatedly try to get the value from the database
2. Implemented try-except to prevent nbrshow termination on database access failure.
3. Added checks for required keys in the dictionary to avoid access failures.
How to verify it
1. Use scapy sending 30k of diffent ARP request packets from another device to the DUT
2. wait the mac start ageout out or execute "nbrshow -4" on the DUT and delete some ASIC_STATE:SAI_OBJECT_TYPE_FDB_ENTRY key from the ASIC_DB same time
Results:
Before:
Key '{ASIC_STATE:SAI_OBJECT_TYPE_FDB_ENTRY:{"bvid":"oid:0x26000000000bd0","mac":"4E:5A:72:F3:09:04","switch_id":"oid:0x21000000000000"}}' unavailable in database '{ASIC_DB}'
After:
...
128.255.251.97 24:93:aa:8b:86:b1 - 100
192.168.0.254 78:18:ec:0d:83:eb eth0 -
192.168.3.46 ac:1f:6b:37:51:a2 eth0 -
Total number of entries 28572
|
/azp run |
|
Azure Pipelines successfully started running 1 pipeline(s). |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Add this suggestion to a batch that can be applied as a single commit.
This suggestion is invalid because no changes were made to the code.
Suggestions cannot be applied while the pull request is closed.
Suggestions cannot be applied while viewing a subset of changes.
Only one suggestion per line can be applied in a batch.
Add this suggestion to a batch that can be applied as a single commit.
Applying suggestions on deleted lines is not supported.
You must change the existing code in this line in order to create a valid suggestion.
Outdated suggestions cannot be applied.
This suggestion has been applied or marked resolved.
Suggestions cannot be applied from pending reviews.
Suggestions cannot be applied on multi-line comments.
Suggestions cannot be applied while the pull request is queued to merge.
Suggestion cannot be applied right now. Please check back later.
When excessive MAC addresses are learned and MAC ageout occurs, pre-fetched keys may become out of sync with the actual state.
What I did
How to verify it
nbrshow -4on the DUTnbrshow -4on the DUT and delete some ASIC_STATE:SAI_OBJECT_TYPE_FDB_ENTRY key from the ASIC_DB same timeResults:
Before:
After: