A 6-to-4 tunnel works similarly to a manual tunnel, except that the tunnel is set up automatically. 6-to-4 tunnels use IPv6 addresses that concatenate 2002::/16 with the 32- bit IPv4 address of the edge router, creating a 48-bit prefix. An example of 6-to-4 tunneling is shown in Figure 21-5. The tunnel interface on Router A has an IPv6 prefix of 2002:C0A8:501::/48, where C0A8:501 is the hexadecimal equivalent of 192.168.5.1, the IPv4 address of its interface in the IP..
Establishing Adjacencies on an NBMA Link
The creation and maintenance of adjacencies becomes more complicated when used over non-broadcast links. An NBMA link is neither a broadcast medium nor a point-to-point link; it is a little of both. Furthermore, IS-IS does not have an NBMA link type. Using PVCs, NBMAs provide multiple connections, which could be viewed as a LAN. The confusion occurs when Integrated IS-IS sees the link is multiaccess. Having no knowledge of multiaccess WAN clouds, Integrated IS-IS believes tha..
Catalyst Configuration File Management
For complete system recovery, make sure that you have a copy of each Catalyst's configuration file stored somewhere other than on the Catalyst itself. If anything happens to the Catalyst Supervisor module, you might not be able to recover the configuration file. It is a crime to have to rebuild the entire configuration file from scratch during a system outage when it is easy to create a backup on a network accessible machine. Through TFTP, you can store your configuration fi..
The IEEE 802.1Q protocol also can carry VLAN associations over trunk links. However, this frame-identification method is standardized, allowing VLAN trunks to exist and operate between equipment from multiple vendors. In particular, the IEEE 802.1Q standard defines an architecture for VLAN use, services provided with VLANs, and protocols and algorithms used to provide VLAN services. You can find further information about the 802.1Q standard at http://grouper.ieee.org/groups/ ..
You enable RIP for an interface by associating its IP address with a network. For example, the Serial0.1 subinterface in this example has an IP address of 172.25.2.2. So if you want this subinterface to take part in RIP route distribution, you just need to include a network statement that includes its address: Router2(config)#router rip Router2(config-router)#network 172.25.0.0 If you have other interfaces that are also part of 172.25.0.0/16 on this router, they will take par..
