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[orchagent]: VXLAN: Fix oper_status and tunnel encapsulation TTL #3383

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@bradh352 bradh352 commented Nov 20, 2024

What I did

This fixes 2 issues across a range of open tickets building upon patches created by others with modifications as requested by @VladimirKuk.

The first issue this resolves is the status shown for remote vteps which in the fact that it is wrong makes debugging nearly impossible:

# show vxlan remotevtep
+------------+------------+-------------------+--------------+
| SIP        | DIP        | Creation Source   | OperStatus   |
+============+============+===================+==============+
| 172.16.0.1 | 172.16.0.2 | EVPN              | oper_down    |
+------------+------------+-------------------+--------------+
Total count : 1

The remote VTEP is really up.

Original PR for that is #2080.

Also fixes sonic-net/sonic-buildimage#10004 or at least the error message which hurts debugging.

The next issue is in reachabiity across VXLANs. This fixes IP/MAC learning via ARP. The original PR for that is #3216, however it appears it has its origins in
sonic-net/sonic-buildimage#10050 which goes into greater detail about the issue itself. Also there is talk about it here kamelnetworks/sonic#9 as well as another similar patch here: kamelnetworks@02ee3e3

Why I did it

Fixes #3216
Fixes #2080
Fixes sonic-net/sonic-buildimage#10050
Fixes sonic-net/sonic-buildimage#10004

How I verified it

Pulled into my private sonic-swss fork:
https://github.com/bradh352/sonic-swss/commits/202405-broadcom

Which is pulled in by my private sonic-buildimage fork:
https://github.com/bradh352/sonic-buildimage/tree/202405-broadcom

Which is then automatically built when changes are made. Then the uploaded asset of sonic-broadcom.bin is installed onto Dell S5248F and N3248TE switches and tested.

Details if related

Signed-off-by: Brad House (@bradh352)

This should also be backported to 202405

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linux-foundation-easycla bot commented Nov 20, 2024

CLA Signed

The committers listed above are authorized under a signed CLA.

This fixes 2 issues across a range of open tickets building upon patches
created by others with modifications as requested by @VladimirKuk.

The first issue this resolves is the status shown for remote vteps
which in the fact that it is wrong makes debugging nearly impossible:
```
+------------+------------+-------------------+--------------+
| SIP        | DIP        | Creation Source   | OperStatus   |
+============+============+===================+==============+
| 172.16.0.1 | 172.16.0.2 | EVPN              | oper_down    |
+------------+------------+-------------------+--------------+
Total count : 1
```

The VTEP is really up.

Original PR for that is sonic-net#2080.

Also fixes sonic-net/sonic-buildimage#10004
or at least the error message which hurts debugging.

The next issue is in reachabiity across VXLANs.  This fixes IP/MAC
learning via ARP.  The original PR for that is sonic-net#3216, however it
appears it has its origins in
sonic-net/sonic-buildimage#10050
which goes into greater detail about the issue itself.  Also there
is talk about it here kamelnetworks/sonic#9 as well as another
similar patch here: kamelnetworks@02ee3e3

Fixes sonic-net#3216
Fixes sonic-net#2080
Fixes sonic-net/sonic-buildimage#10050
Fixes sonic-net/sonic-buildimage#10004
Signed-off-by: Brad House (@bradh352)
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Looks good to me

@bradh352
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@VladimirKuk any idea if those test failures are actually a symptom of the patch itself? Or is it just common for things to fail in the tests from time to time?

@VladimirKuk
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Tests do fail from time to time.
At least to me, these tests are unrelated to the change.

@bradh352
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@prsunny please review

@lukasstockner
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Thank you for pushing this forward!
For the record, we've been running these changes in production for ~2 years without issues, so I'd be quite confident that they work as expected.

@bradh352
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@prsunny ping

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