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.
vlan 304 has a SVI IP of 192.168.4.1. all have a mask of 255.255.255.192 and all have the ip helper-address ip of 192.168.2.150. the IP of the router layer 3 port is 192.168.2.253 255.255.255.248. the IP of the router is 192.168.2.254 and all the routes back to the SVI are in the router.