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.
up vote 7 down vote. To add VLANs to a trunk you have to use the following syntax: To remove a VLAN from the trunk you need to use the remove syntax: When you don't use add/remove you're telling the port to only configure the new VLAN. This is a common error. If your platform supports it you can use the Cisco Embedded Event Manager to forbid this harmful syntax: