Fast Switching (ip route-cache) during a route change.
The basic definition of fast switching says that whenever there is a new packet on the ingress interface the first packet is always process switched and
outbound interface and a MAC header for this destination is tsored in a fast cache. The next time and every subsequent time a simlar packet arrives the interface
consults the Fast Cache directly to determine whether an outbound interface and a MAC header have been cached for this destination and if there is, the CPU is not interrupted and the data in the fast cache table is used to forward the packet.
I assume that the fast cache table is not updated dynamically when there is a route change like in case of CEF and is only updated when the first packet is process switched.
1) If any time after the entry is stored in the fast cache if there is route changes to a different interface what will happen ?
2) The fast cache contains the old entry so will the subsequest packets be dropped becasuse that route is no more valid?
3) How will the interface on which the packet arrives realize that the entry for this destination is now stale and the packet needs to be process switched again to revalidate the fast cache data?
I've got a one problem. Me and my friend have the same ISP. I checked my External IP address at WhatIsMyIp.com and my friend do it to. And we saw we have the same External IP.So my question is can 2 routers have the same External IP address?If i'm right 2...
LISP Protocol (Location Identifier Separation Protocol)! - The LISP protocol has become a brilliant stardom with the digital transformation that we are now experiencing. - Today we will talk about the LISP protocol and its advantages and method of p...
SD-Access provides automated end-to-end services (such as segmentation, quality of service, and analytics) for user, device, and application traffic. SD-Access automates user policy so organizations can ensure the appropriate access control and applicati...
Purpose: This document shows you how to create a group-based security policy in Cisco DNA Center.
Security policies determine the types of network traffic permitted or denied between scalable groups. Scalable groups are a critical compo...
Are you an experienced network professional?
If yes, we'd like to understand how we can better organize network management activities in a way that makes sense to you. Your response will help Cisco improve a product feature that could benefit you.&nb...