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    

Deploying EIGRP on a Large-Scale Three-Layer Hierarchical Network

Many networks have been built around the core, distribution, and access layer model, because it provides a well-defined separation of functions into the various portions of the network. It also provides an excellent topology to apply scalability improvement techniques such as summarization. Using the network described in Figure 3-1, this section describes how you can implement the information hiding technique of summarization at each of the three layers: core, distribution..

Connecting VLAN Trunks with ISL

The following set of commands allows you to connect an ISL trunk to your router: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router1(config)#interface FastEthernet0/0 Router1(config-if)#no ip address Router1(config-if)#speed 100 Router1(config-if)#full-duplex Router1(config-if)#exit Router1(config)#interface FastEthernet0/0.1 Router1(config-subif)#encapsulation isl 1 Router1(config-subif)#ip address 172.25.1.5 255.255.255.0 R..

Cisco Implementations of Frame Relay Fragmentation

This section discusses the few fragmentation schemes supported by Cisco. Cisco has developed three different methods of performing fragmentation with Frame Relay: FRF.12 Fragmentation, Frame Relay Fragmentation using FRF.11 Annex C, and the Cisco Proprietary Fragmentation. Each fragmentation scheme uses a different data format or encapsulation. Frame Relay frames are fragmented based on one of the three formats, depending on how the Frame Relay PVC was set up. It is importan..