Physical Versus Logical Connections

External BGP neighbors have a restriction in that they must be physically connected, adjacent to one another. BGP drops any UPDATE message from its external BGP peer if the peer is not physically connected, unless otherwise specified. However, some situations arise in which external neighbors cannot...

Neighborship and Reliable Incremental Updates

EIGRP produces reliable updates by identifying its packets using IP protocol 88. Reliable, in a networking context, means that the receiver acknowledges that the transmission was received and understood. EIGRP only repeats itself if an advertisement is lost, so EIGRP is less "chatty" than other prot...

Understanding QoS

Appreciating what QoS tools and methods do to packets in a network is fundamental to appreciating the effect of individual QoS tools discussed in later chapters, and ultimately understanding the network designs and methods that constitute the material in this book. End-to-End QoS Regardless of h...

Rate-Limiting Syslog Traffic

Use the logging rate-limit configuration command to limit the number of syslog packets sent to your server: Router#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router(config)#logging host 172.25.1.1 Router(config)#logging rate-limit 30 except warnings Ro...

Dynamically Allocating Client IP Addresses via DHCP

The following set of configuration commands allows the router to dynamically allocate IP addresses to client workstations: Router1#configure terminal Enter configuration commands, one per line.  End with CNTL/Z. Router1(config)#service dhcp Router1(config)#ip dhcp pool 172.25.1.0/24 ...

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