Building BGP Neighbor Relationships

BGP neighbors form a TCP connection with each neighbor, sending BGP messages over the connections—culminating in BGP Update messages that contain the routing information. Each router explicitly configures its neighbors’ IP addresses, using these definitions to tell a router with which IP addresses to attempt a TCP connection. Also, if a router receives a TCP connection request (to BGP port 179) from a source IP address that is not configured as a BGP neighbor, the router ..

RTS/CTS and Fragmentation Summary

Table 22-3 summarizes some of the benefits and drawbacks of both RTS/CTS and fragmentation when trying to improve throughput in a wireless network. Table 22-3 Improving Throughput Using RTS/CTS and Fragmentation    

Understanding the IS-IS Area Concepts

Routers with common area IDs belong to the same area. By the nature of its addressing system, IS-IS forces this hierarchy. IS-IS has two layers of hierarchy: level 1 and level 2 (backbone). The backbone must be contiguous. In IS -IS, the area border is on the links instead of the router. Routers that connect multiple areas maintain two separate link-state databases: one for level 1 areas, and the other for level 2 areas. The routers also run two separate SPF algorithms. ..

Deploying EIGRP on a Two-Layer Hierarchical Network

Now that you have had an opportunity to consider many of the techniques that are available to improve EIGRP stability and scalability in a three-layer hierarchical network design, you can explore another common design choice. Many companies that have smaller networks either geographically or topologically, or networks that have stricter latency requirements, use a two-layer network design instead of the traditional three-layer design. This section discusses how to use some of..

Using Route Maps to Refine Static Translation Rules

One of the best uses of this feature appears when you have two Internet Provider connections and you want to use distinct NAT rules for each: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#interface FastEthernet0/0 Router(config-if)#ip address 172.16.1.5 255.255.255.252 Router(config-if)#ip nat outside Router(config-if)#exit Router(config)#interface FastEthernet0/1 Router(config-if)#ip address 172.16.2.5 25..