Understanding WAN Quality of Service

The time has come, CCIE Collaboration hopefuls, to focus my blog on Quality of Service (QoS). I know, it’s everyone’s favorite subject, right? Well, you don’t have to like it; you just have to know it! I would specifically like to focus on WAN QoS policies as they are going to be an essential piece of the lab blueprint to understand. Typically, the goal on a WAN interface is to queue traffic in such a way as to prioritize certain types of traffic over other types of traffic. Voice traff

Configure a Highly-Available IPSec VPN tunnel on IOS

It is possible to configure Highly-Available IPSec VPN tunnel on IOS so that the SA information is replicated between the routers. This ensures that a potential failover will be transparent to users and it will not require adjustments or reconfiguration of any remote peers. There are two protocols used to deploy this feature, HSRP and Stateful Switchover (SSO). HSRP is one of the First Hop Redundancy Protocols that provide network redundancy for IP networks, ensuring that user traffic immedia