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Vlan name length limitation of 30 characters #282

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opened 2025-12-29 16:20:29 +01:00 by adam · 6 comments
adam commented 2025-12-29 16:20:29 +01:00
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Originally created by @Zanthras on GitHub (Jul 23, 2016).

Not a huge deal, but why the limit of 30 not 32 characters on the VLAN model? The upper limit for IOS has historically been 32.

Originally created by @Zanthras on GitHub (Jul 23, 2016). Not a huge deal, but why the limit of 30 not 32 characters on the VLAN model? The upper limit for IOS has historically been 32.
adam added the type: feature label 2025-12-29 16:20:29 +01:00
adam closed this issue 2025-12-29 16:20:29 +01:00
adam commented 2025-12-29 16:20:30 +01:00
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@jeremystretch commented on GitHub (Jul 25, 2016):

We just happen to use a 30-character limit for most (all?) object names. AFAIK there's no official limit on the VLAN name length, since the name is never carried on the wire. (The exception to this is Cisco's proprietary VTP, which seems to enforce, or at least suggest, a 20-character maximum.)

I don't see any reason not to increase the VLAN name field to 32 characters.

@jeremystretch commented on GitHub (Jul 25, 2016): We just happen to use a 30-character limit for most (all?) object names. AFAIK there's no official limit on the VLAN name length, since the name is never carried on the wire. (The exception to this is Cisco's proprietary VTP, which seems to enforce, or at least suggest, a [20-character maximum](https://supportforums.cisco.com/discussion/11610686/vlan-names-exceeded-20-characters).) I don't see any reason not to increase the VLAN name field to 32 characters.
adam commented 2025-12-29 16:20:30 +01:00
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@Zanthras commented on GitHub (Jul 25, 2016):

NX-os forces 32 character vlan limits until a later version enabled a feature to make it longer, ios pre 15 seems to silently truncate on 32 chars. But in any case you want me to create a pull request to raise it? (I have a number of vlans names at 32 chars which i would like to import without modification)

@Zanthras commented on GitHub (Jul 25, 2016): NX-os forces 32 character vlan limits until a later version enabled a feature to make it longer, ios pre 15 seems to silently truncate on 32 chars. But in any case you want me to create a pull request to raise it? (I have a number of vlans names at 32 chars which i would like to import without modification)
adam commented 2025-12-29 16:20:31 +01:00
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@jeremystretch commented on GitHub (Jul 25, 2016):

Well, is 32 characters long enough?

@jeremystretch commented on GitHub (Jul 25, 2016): Well, is 32 characters long enough?
adam commented 2025-12-29 16:20:31 +01:00
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@Zanthras commented on GitHub (Jul 25, 2016):

Im sure there are "interesting" deployments that have vlan names at extreme levels, But a smaller sane limit of say 128 that fits most? cases probably isnt bad.

@Zanthras commented on GitHub (Jul 25, 2016): Im sure there are "interesting" deployments that have vlan names at extreme levels, But a smaller sane limit of say 128 that fits most? cases probably isnt bad.
adam commented 2025-12-29 16:20:31 +01:00
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@jeremystretch commented on GitHub (Jul 25, 2016):

Based on some feedback I upped the name length to 64 characters in d241cce. Should be sufficient.

@jeremystretch commented on GitHub (Jul 25, 2016): Based on [some feedback](https://www.reddit.com/r/networking/comments/4ujp9u/long_vlan_names/) I upped the name length to 64 characters in d241cce. Should be sufficient.
adam commented 2025-12-29 16:20:31 +01:00
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@Zanthras commented on GitHub (Jul 25, 2016):

Sounds good to me!

@Zanthras commented on GitHub (Jul 25, 2016): Sounds good to me!
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