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Native routed VLAN breaks all other VLANs on the same trunk #421

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ipspace opened this issue Sep 9, 2022 · 1 comment
Closed

Native routed VLAN breaks all other VLANs on the same trunk #421

ipspace opened this issue Sep 9, 2022 · 1 comment

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@ipspace
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ipspace commented Sep 9, 2022

The following topology creates three routed segments on the R1-R2 link (native, red, and blue):

defaults.device: iosv
module: [ vlan ]
vlans:
  red:
  blue:
  pxeboot:
    mode: route

nodes:
  r1:
  r2:

links:
- r1:
  r2:
  vlan.trunk: [ red, blue, pxeboot ]
  vlan.native: pxeboot

Removing native VLAN results in correct data structure (two bridged VLANs, one routed VLAN on a VLAN-tagged subinterface). It looks like the vlan.mode from pxeboot VLAN is copied to the main interface (too soon?). Bad idea...
@ipspace
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ipspace commented Sep 9, 2022

See also #415

jbemmel pushed a commit to jbemmel/netlab that referenced this issue Sep 10, 2022
@ipspace @jbemmel
Create VLAN links from a VLAN trunk before handling access/native VLAN (
e13bf75 
fixes ipspace#421)

* VLAN trunk is created before changing any link attributes based on access/native VLAN
* On routed access/native VLANs, set vlan.mode on all interfaces, not just on link
  (because it won't be copied into interface attributes)
* Check whether routed native VLAN is supported by the platform
  (implements feature flag discussed in ipspace#415)
* Cisco IOSv is the only device so far known to support routed native VLANs.
  FRR/Cumulus should be able to do that as well, but that needs to be verified.
* Add 'routed native VLAN' test case
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@ipspace