Two Final Tiebreaker Steps in the BGP Decision Process
It is possible for BGP to fail to determine a best path to an NLRI using Steps 0 through 8, so BGP includes the following tiebreakers. These values would not typically be manipulated in a routing policy to impact the decision process. 9. Smallest advertising eBGP RID, or iBGP RID, with an exception—If some routes are eBGP routes, the router prefers the route that was advertised by the eBGP router with the lowest RID. If only iBGP routes exist, the same logic is used but fo..
For some time, the FCC has been encouraging the telephony industry, through legislation, to allow competition in both the long-distance and local-area markets. The Internet is already there without legislation, but certainly has used the help of government policy through the NSF. From a technological viewpoint, the peer-to-peer model of IP has contributed greatly to the ease with which competition has been introduced. Today, a number of national service provider..
The Cisco Intrusion Detection System (IDS) provides an in-depth, self-healing mechanism to provide network administrators a defense against attacks from inside and outside the network. The Cisco definition of a self-healing network is a network that is intelligent enough to stop unwanted traffic and correct any security vulnerabilities before they occur. Beginning with Cisco IDS 4.0, the network IDS sensors use the Remote Data Exchange Protocol (RDEP) for communication. With..
Disabling the Cisco Discovery Protocol
CDP can be an extremely useful feature because it tells you so much information about all of your neighboring devices. However, this can also represent a serious security problem. CDP packets are not encrypted in any way, so if somebody can just capture the CDP packets from a network segment as they pass between the routers, they can easily deduce a lot about your network architecture. And if they can get access to the router either via Telnet or SNMP, they can use the CDP ta..
Recall that, by definition, a switch must forward broadcast frames out all available ports in the broadcast domain because broadcasts are destined everywhere there is a listener. Unless forwarded by more intelligent means, multicast frames follow the same pattern. In addition, frames destined for an address that the switch has not yet learned or has forgotten (theMAC address has aged out of the address table) must be forwarded out all ports in an attempt to find the destinati..
