My problem is that I need to provide full tunnelling for the dmvpn users behind ISR 881. Is PBR a good option? Is it not gonna kill the router's CPU? My understanding is if Cef is enabled then it should not affect CPU load at every packet, only at the first ones. Thanks
There are subtle aspects to the question and its answer and we need to be careful in how we understand them. It is absolutely true that this class of router forwards everything in software and that every packet will be handled by the CPU, and therefore that every packet will contribute to CPU busy. However it is not the same as a process switched packet which can impose a higher load on the CPU. With CEF enabled the search of the forwarding table is made more efficient and the adjacency table already has the layer 2 rewrite data calculated. So the forwarding of a packet in CEF is much more efficient (lower CPU burden) than a process switched packet would be.
It seems to me that the original question really has two parts:
- hardware or software forwarding and the answer is software
- CEF or process switching and the answer is CEF.
We have no information about how many dmvpn peers, how many users, or how much traffic will be generated. These factors would need to be considered to determine whether the 881 is an appropriate platform for this deployment.
We have 3 identical switches configured by someone else and would like to claim some of the Gigabit ports(G1/G2/G3/G4) for use on servers. When we try to change the wiring and configuration, we run in to connectivity issues. Attached is a des...
This is actually a pretty cool feature, i didn't even know it existed until I was looking for a solution to advertise a subnet (prefix in BGP talk), only if a certain condition existed. This is exactly what conditional advertisements does
j ai une question j ai achete un routeur cisco 887VA-k9 , je le configuré avec la configuration ci- dessous
si je le lier avec mon pc portable sur l un de ses ports directement ça marche toute est bien ( la connexion internet + m...