Tài liệu Intermittent broadcast storms ppt

Here is the top bugs instructors like to use from someone whose been on the inside and has friends still there. 1. Config registers. Know them by heart. They laugh when a candidate fails and leaves in frustration because of the surprising results they're getting during troubleshooting, and it won't be the obvious, and it can happen to more than one router. 2.Hold downs and NBMA. They're amazed how many guys fail when they manipulate the timers. Be sure you know the hello intervals, updates, hold downs, ect on the various protocols between medias such as NBMA and broadcast, so you don't fall into that trap. 3. Intermittent broadcast storms A tough one, especially when it's gone as fast as it came before you can bring your guns to bare. One minute a pc is locked up on network neighborhood, the next everything's fine. Windows NT is good for this, but what about coming from a router or a switch. You know the deal, divide and conquer. Setting broadcast supression on those port to see which broadcasts got dropped comes in handy. 4. Summarization, summarization, summarization. If some of those hosts are not being reached from outside an ASBR, look for this. 5. Wrong BGP Paths. With the web so popular, it's common bug. ( If you're going to the lab in NC, study BGP reflector. This lab has just been added after finding out this info. 6. NAT and Pat. Another common bug. 7. Access-lists. Sounds simple. Troubleshooting a missconfigured list to exclude a subnet, a protocol, or a host: instructors say"too easy". They like lists that excludes 1/4 of a subnet, or creating an environment where an app gets through sometimes, other tomes it's blocked. 8. The first thing you do when you configure anything is password all your vty ports, because if you don't , they'll go right in the back door and change your configs on you. Too many guys failed because they forgot to do this simple task. The instructors hold network security in high regards. . protocols between medias such as NBMA and broadcast, so you don't fall into that trap. 3. Intermittent broadcast storms A tough one, especially when it's. switch. You know the deal, divide and conquer. Setting broadcast supression on those port to see which broadcasts got dropped comes in handy. 4. Summarization,