The previous chapter examined the process of BGP neighbor negotiation at a fairly technical level. It emphasized the formats of messages exchanged during negotiation. This chapter now expands the examination to consider additional subtleties of the negotiation process. In addition, this section introduces distinctions between internal and external BGP, which have practical implications in building peer sessions. Although BGP is most commonly used to provide a loop-free inter..
Very soon after ratification of the 802.11b standard, 802.11b access points and radio cards began shipping. It was a fairly easy modification to existing 802.11 DSSS devices to become 802.11b-compliant. In fact, most users could upgrade their existing access points and radio cards with simple firmware upgrades. For several years, 802.11b devices were the best ones on the market, so they proliferated throughout the industry and became the most commonly installed wireless LAN h..
Monitoring and Troubleshooting Multilink Frame Relay
This section discusses the various show commands for monitoring and maintaining Multilink Frame Relay on a Cisco router. The end of this section looks at the IOS debug commands available for troubleshooting Multilink Frame Relay. The network diagram portrayed in Figure 14-1 and the base configurations shown in Example 14-1 are used for this discussion. Example 14-6 shows the output of the show interface mfr [mfr_number] command. This is executed on router R1 after the bundle..
Route summarization works best when the subnet planning process considers route summarization. To accommodate summarization, the engineer assigning subnets can assign larger address blocks to one part of the topology. The engineers working with that part of the internetwork can break the address blocks into individual subnets as needed. At the edge of that part of the network, the engineers can configure route summaries to be advertised to the other parts of the internetwork...
Access List Configuration Tasks
Whether you are creating a standard or extended access list, you need to complete the following two tasks: Step 1 Create an access list in global configuration mode by specifying an access list number and access conditions. Define a standard IP access list using a source address and wildcard, as shown later in this section. Define an extended access list using source and destination addresses, as well as optional protocol-type information for finer granularity of contro..
