Sunday, November 29, 2020

Voice VLAN / LLDP for Voip Question

Hi r/networking

First timing posting and this is quite possibly a silly question (i'll preface this with i'm pretty network savvy, but far from being an expert, i did my CCNA many years ago because the knowledge helped with understanding more network related issues within my role of cloud/virtual infrastructure), but here it goes?

If a switch is configured to have its ports as access vlan 100 and voice vlan 120 does this mean that any device plugged directly into the switch (that is not a phone supporting lldp) is using access vlan 100 by default?

For context, when dealing with VoIP we always went the way of trunking the ports and running a vlan for data/voip (tag voip untag data or in cisco terms trunk+native) along with manual config or DHCP options. With a new building we are in the early stage of designing the network, and the provider we will be using (Avaya) suggested using LLDP along with a voice vlan command (which is fine) but personally I have no exp with (first time I'll implementing it).

Are there also any additional hidden things enabled in the background when running the access/voice vlan commands (i've seen stp mentioned a few times for some vendors)

TLDR: I might be over thinking this, but is setting access/voice commands just setting a tag/untag (or trunk with native vlan) pair and LLDP is just telling the phone "hey buddy, voice vlan is 120 you should use that instead..."?



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