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..
The behavior of link-state protocols is different when handling non-broadcast multiaccess networks. In this situation, a difference always exists between physical and logical topology. For broadcast networks, for example, a pseudonode is created and is flooded with the ID set to the ID of the DIS. The broadcast model will also be successful in the frame or ATM cloud, as long as all the virtual circuits are operating properly. When a PVC breaks down, forwarding and routing is ..
Comparison of the OSPF Restart Mechanisms
The two approaches share many similarities, including the following: • Both have the goals of retaining adjacencies with neighbors and continuing to forward across the restart. • Both require protocol extensions. • Both require support from neighbors. • Both can be used for unplanned and planned restarts. In terms of mechanics, however, these restart approaches differ significantly, as follows: ..
Defining DHCP Configuration Options
You can configure a wide variety of DHCP parameters for configuring client workstations: Router1#configure terminal Enter configuration commands, one per line. End with CNTL/Z. Router1(config)#ip dhcp pool ORAserver Router1(dhcp-config)#host 172.25.1.34 255.255.255.0 Router1(dhcp-config)#client-name bigserver Router1(dhcp-config)#default-router 172.25.1.1 172.25.1.3 Router1(dhcp-config)#domain-name oreilly.com Router1(dhcp-config)#dns-server 172.25.1.1 10.1.2.3..
