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Natural ordering issue (Cisco Nexus) #5139
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opened 2025-12-29 19:24:44 +01:00 by adam
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Reference: starred/netbox#5139
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Originally created by @candlerb on GitHub (Aug 4, 2021).
NetBox version
v2.11.10
Python version
3.6
Steps to Reproduce
Ethernet1/[1-54], type SFP28Ethernet1/[49-54], type QSFP28Ethernet1/[49-53]/[1-4], type SFP28This is representative of a Cisco Nexus 93180. There are 48 SFP28 ports and 6 QSFP28 ports. In the last step you've configured the first five of those as breakout to
10g-4x.Expected Behavior
I expected interfaces to sort as:
Ethernet1/1Ethernet1/48Ethernet1/49Ethernet1/49/1Ethernet1/49/2Ethernet1/49/3Ethernet1/49/4Ethernet1/50Ethernet1/50/1Ethernet1/50/2Ethernet1/50/3Ethernet1/50/4Ethernet1/53/4Ethernet1/54Observed Behavior
Interfaces are shown in the following order:
Ethernet1/49/1Ethernet1/49/2Ethernet1/49/3Ethernet1/49/4Ethernet1/50/1Ethernet1/53/4Ethernet1/1Ethernet1/2Ethernet1/54That is, all the breakout interfaces as shown before all the main interfaces (including the ports they are associated with).
This is how they are represented in the database:
@jeremystretch commented on GitHub (Aug 12, 2021):
Marking this as open for volunteers, however it may be challenging to accomplish. Any proposed solutions would need to include a passing test for the above mentioned condition, and must not alter any of the existing tests under
dcim.tests.test_natural_ordering.@zombah commented on GitHub (Aug 13, 2021):
Maybe something like per platform custom ordering switch.
Create platform fe NX-OS, enable custom ordering there and add regexp strings
for required ordering.
If this is somehow possible it will suit all possible natural ordering
problems.
@jeremystretch commented on GitHub (Aug 13, 2021):
@zombah we've tried that in past releases and it imposes a lot of problems.
@candlerb commented on GitHub (Aug 13, 2021):
Cross-reference older issues: #2134 #2872; and the existing code which naturalizes interface names is here. Note that there used to be an "interface ordering" option on the device type, but it has gone.
In #2872 I proposed an algorithm here which was simply to split all interface names into alternating string and numeric part. The first part is always a string, but may be empty. Then you get a part-by-part comparison like this:
This is certainly a very, very dumb algorithm, and it hard-codes no knowledge about vendor conventions. A trial implementation, complete with the Netbox unit tests, is here - I've just brought it up to date, although the tests haven't changed much.
Now, this fails on the junos and ios test cases.
whereas mine puts all the GigabitEthernet interfaces before the TenGigabitEthernet interfaces.
I think the last one is the substantive point. I expect the reason is because the first number indicates the "line card" in Cisco terms, and if a line card has a mix of interface types you want to see them together. That's fair enough, although I think the test case would be clearer like this:
otherwise it's ambiguous whether the results are grouped because TenGigabit comes after Gigabit, or because 20 comes after 10.
What about these?
I have tested this with Netbox 2.11.10, and I get:
(which is essentially the issue I'm reporting here with Nexus).
Anyway: it seems these approaches to sorting are not reconcilable without the user providing some extra information. So what I'm thinking is:
naturalize_interfacefunctions which mapnameto_name. I think we need only two: the current one, and one which works better with non-IOS devices. However further ones could be added if necessary._nameon all devices of that type.Aside: having both
0/0and0/0/0can happen in real life even on IOS. Here's a 2901 that I have access to:However these are three separate ports, 0/0/0 is not a sub-interface of 0/0.
@github-actions[bot] commented on GitHub (Oct 13, 2021):
This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. NetBox is governed by a small group of core maintainers which means not all opened issues may receive direct feedback. Please see our contributing guide.
@github-actions[bot] commented on GitHub (Nov 12, 2021):
This issue has been automatically closed due to lack of activity. In an effort to reduce noise, please do not comment any further. Note that the core maintainers may elect to reopen this issue at a later date if deemed necessary.