Filtering Subnets of a Summary Using the aggregate-address Command
Manual BGP route summarization, using the aggregate-address BGP router subcommand, provides the flexibility to allow none, all, or a subset of the summary’s component subnets to be advertised out of the BGP table. By allowing some and not others, the aggregate-address command can in effect filter some routes. The filtering options on the aggregate-address command are as follows: ■ Filtering all component subnets of the summary from being advertised, by using the summary-..
Proprietary and Open Protocols
The important aspects of routing protocols are that they are fast and that they are classless. Three routing protocols fit that description: OSPF, IS-IS, and EIGRP. All three protocols are wholly acceptable; however, there are some small differences between them from a support perspective. OSPF and IS-IS are public standards, and are therefore supported on a wider variety of equipment than proprietary protocols. This protects against incompatibilities with legacy equipment ..
Enhanced IGRP uses five metrics to determine the best path to a destination: lowest bandwidth, total delay, reliability, load, and MTU: Lowest bandwidth is calculated based on the minimum bandwidth to the destination network. Total delay is the sum of all the delays to the destination network. Reliability refers to how much the information can be trusted or how reliable the path is. This is not activated, by default. Load refers to how congested the outgoing link ..
SSL is an encryption technology for web host devices used to process secure transactions. For example, a secure transaction is required when a client enters their credit card number for e-commerce via their browser. When the end user enters a web address via an Internet browser, such as Internet Explorer, instead of entering HTTP://web address in the address window, the end user enters HTTPs://web address. Note Secure Hypertext Transfer Protocol (S-HTTP) transports HTTP-bas..
It's important to remember that unlike EIGRP and RIP, OSPF uses a link state rather than a distance vector algorithm. One place where this difference becomes clear is in route filtering. At a minimum, every router in an area must see the LSAs for every other router in the same area. Depending on the type of area, it may also see summary LSAs representing routing information from other areas or other autonomous systems. These LSA packets are flooded throughout the area, with e..
