Firewall protection vpn support mpls support vlan support syslog support ipv6 support class based weighted fair queuing cbwfq the cisco 1921 builds on the best in class all cisco 1900 series integrated services routers offer embedded hardware encryption acceleration and advanced security services in addition the platforms support the industrys widest range of wired and wireless connectivity options such as serial t1e1 xdsl gigabit ethernet and third generation 3g wireless