Troubleshooting RIPv2 and RIPng
Two configuration problems common to RIPv2 are mismatched versions and misconfigured authentication. Both difficulties are easy to discover with debugging, as Example 6-29 shows. Example 6-29. Debugging reveals mismatched versions and misconfigured authentication. Jemez#debug ip rip events RIP event debugging is on Jemez# RIP: ignored v1 packet from 172.25.150.249 (illegal version) RIP: ignored v2 packet from 172.25.150.249 (invalid authentication) Jemez# A more likel..
Network Security Promotes Good Network Design
Although it happens far less often now, I still occasionally sit down with a customer who says, "OK, the network design is done, now we need to think about security. We're certain we need a firewall and have also heard something about IDS." Designing secure networks in this manner puts you on a fast track to a network design in which the security is tacked on, interferes with the performance of the network, and is viewed by the rest of the Information Technology (IT) staff a..
Configuring Frame Relay RTP Header Compression
RTP, defined in RFC 1889, is designed specifically for transporting audio and video traffic in packets over an IP-based network. RTP provides end-to-end transport for applications that support audio, video, multicast, or unicast network services. The RTP protocol format includes both header and data portions. The data portion of RTP provides support for real-time applications, such as continuous media streaming, loss detection, timing reconstruction, and content identificati..
If a switch does not seem to be receiving updated information from a VTP server, consider these possible causes: ■ The switch is configured for VTP transparent mode. In this mode, incoming VTP advertisements are not processed; they are relayed only to other switches in the domain. ■ If the switch is configured as a VTP client, there might not be another switch functioning as a VTP server. In this case, configure the local switch to become a VTP server itself. ■ T..
Baseline Configuration for EIGRP Redistribution Examples
The best method to see the results of redistribution is to use examples, so this section explains the sample internetwork used in the upcoming EIGRP redistribution examples. Figure 9-6 shows the sample internetwork. In this case, the EIGRP domain on the left uses subnets of class B network 172.30.0.0, and the OSPF domain on the right uses subnets of class B network 172.16.0.0. Note that all OSPF subnets reside in area 0 in this example internetwork, although that is not a re..
