Our recent work on the regioselective synthesis of a number of heterocycles (4) prompted us to search for a simple and effi- cient reagent for this heterocyclization. We have recently achieved a facile entry to this ring system 6 (5) with the use of a well-known brominating agent, pyridine hydrobromide per- bromide, which we report here.
Voice VLAN. 1  Voice VLAN allows you to enhance VoIP service by configuring ports to carry IP voice traffic from IP phones on a specific VLAN. VoIP traffic has a preconfigured OUI prefix in the source MAC address. 2  You can configure VLANs on which voice IP traffic is forwarded.
When a switch port is configured with the default natave vlan, you will really not see a native vlan configured in the configuration on that port. This is the equivalent of switchport trunk native vlan 1.In this case any traffic on vlan 1 that is leaving the switch is untagged.. Re: Native VLAN. When a switch port is configured with the default natave vlan, you will really not see a native vlan configured in the configuration on that port. This is the equivalent of switchport trunk native vlan 1. In this case any traffic on vlan 1 that is leaving the switch is untagged.