Configuring the Default Metric for OSPF, IS-IS, RIP, or BGP
It is possible to redistribute the routing protocol and then, with a separate command, to state the default metric. There is no advantage to handling metric assignment within the redistribute command or separately. IS-IS cannot define a default metric. The metric must be stated when redistributing. If no metric is stated, the default (0 cost) is entered and the route discarded. To configure the default metric for OSPF, RIP, or BGP, use the following command syntax: Ro..
The Cisco SAFE Blueprint document (available at http://www.cisco.com/go/safe) suggests a wide variety of best practices for switch security. In most cases, the recommendations depend on one of three general characterizations of the switch ports, as follows: ■ Unused ports—Switch ports that are not yet connected to any device—for example, switch ports that are pre-cabled to a faceplate in an empty cubicle ■ User ports—Ports cabled to end-user devices, or any cablin..
The purpose of the default route in any routing protocol is to forward traffic to destinations that are not in the router's routing table. It is not possible for all the routers in a network to have full Internet routes. For this purpose, routers without full routes to all the destinations forward traffic to the default originating router. Level 1 routers never maintain information about any destination that is outside their area, so all level 1 routers merely s..
Now plan a road trip from Chicago to San Jose. Assume you have just moved to Chicago, you are not yet familiar with the area, and you need help getting out of the city. Before you plan your route, you first need to know where you are going and where you are coming from. Does that sound familiar? This is not unlike using the source and destination addresses in your postal system. Certainly to begin planning the route, you must know where you are starting; but after you begin t..
Converting Ethernet and Token Ring MAC Addresses
The Perl script in Example 15-1 converts Ethernet addresses to the way they will appear when connected through a bridge to a Token Ring. It also performs the reverse translation of Token Ring addresses to Ethernet, which is identical. Example 15-1. eth-tok-mac.pl #!/usr/local/bin/perl # # eth-tok-mac.pl -- a script to convert Ethernet to Token Ring MAC # addresse..
