Avoiding Problems with Network Convergence When Redistributing
A major concern is the computation of the routing table and how long it takes the network to converge. Although EIGRP is renowned for its speed in convergence, RIP is fairly slow. Sharing network information between the two might cause problems. For example, the network converges at the speed of the slower protocol. At some point, this will create timeouts and possibly routing loops. Adjusting the timers might solve the problems, but any routing protocol configu..
This section covers the concepts behind four separate methods for finding the RP. Three are specific configuration features, namely static configuration, Auto-RP, and BSR. The fourth, Anycast RP, actually uses any of the first three methods, but with the design that includes having the RPs use the same unicast IP address to achieve better redundancy features. Table 20-3 summarizes the methods of finding the RP with PIM-SM. Table 20-3 Comparison of Methods of Finding the RP
The remainder of this chapter will focus on troubleshooting some common problems when using the Cisco VPN Client software. The first topic I'll discuss is the logging abilities of the software client: the Log Viewer component of the VPN Client. Then I'll discuss some common problems you'll typically come across and what to look for on your computer (or concentrator) to troubleshoot these problems: • Authentication Problems • ISAKM..
A Message Digest 5 (MD5) hash is computed on a portion of each HSRP message and a secret key known only to legitimate HSRP group peers. The MD5 hash value is sent along with HSRP messages. As a message is received, the peer recomputes the hash of the expected message contents and its own secret key; if the hash values are identical, the message is accepted. MD5 authentication is more secure than plain-text authentication because the hash value contained in the HSRP messages i..
Monitoring and Troubleshooting Tail Drop and WRED
The show interface privileged EXEC mode command can be used to display the queuing strategy used on the interface, as shown in Example 21-4. Example 21-4. Output of show interface Command on Router R2 R2#show interface serial2/2 Serial2/2 is up, line protocol is up Hardware is CD2430 in sync mode MTU 1500 bytes, BW 128 Kbit, DLY 20000 usec, reliability 255/255, txload 11/255, rxload 1/255 Encapsulation FRAME-RELAY, loopback not ..
