538 CHAPTER 40: T UNNELING CONFIGURATIONDAD transmits 0default site prefix length 48# A link-local address (fe80::5efe:2.1.1.2) in the ISATAP format was automaticallygenerated for the ISATAP interface. Configure the IPv4 address of the ISATAPswitch on the ISATAP interface.C:\>ipv6 rlu 2 2.1.1.1# After carrying out the above command, look at the information on the ISATAPinterface.C:\>ipv6 if 2Interface 2: Automatic Tunneling Pseudo-InterfaceGuid {48FCE3FC-EC30-E50E-F1A7-71172AEEE3AE}does not use Neighbor Discoveryuses Router Discoveryrouting preference 1EUI-64 embedded IPv4 address: 2.1.1.2router link-layer address: 2.1.1.1preferred global 2001::5efe:2.1.1.2, life 29d23h59m46s/6d23h59m46s (public)preferred link-local fe80::5efe:2.1.1.2, life infinitelink MTU 1500 (true link MTU 65515)current hop limit 255reachable time 42500ms (base 30000ms)retransmission interval 1000msDAD transmits 0default site prefix length 48# By comparison, it is found that the host acquires the address prefix 2001::/64and automatically generates the address 2001::5efe:2.1.1.2. Meanwhile, “usesSwitch Discovery” is displayed, indicating that the switch discovery function isenabled on the host. At this time, ping the IPv6 address of the tunnel interface ofthe switch. If the address is successfully pinged, an ISATAP tunnel is established.Configuration verificationAfter the above configurations, the ISATAP host can access the host in the IPV6network.Displaying andMaintaining TunnelingConfigurationTroubleshootingTunnelingConfigurationSymptom: After the configuration of related parameters such as tunnel sourceaddress, tunnel destination address, and tunnel type, the tunnel interface is stillnot up.Solution: Follow the steps below:1 The common cause is that the physical interface of the tunnel source is not up.Use the display interface tunnel or display ipv6 interface tunnel commandsto view whether the physical interface of the tunnel source is up. If the physicalTo do… Use the command… RemarksDisplay information abouta specified tunnel interfacedisplay interface tunnel [ number ] Available in any viewDisplay IPv6 informationrelated to a specifiedtunnel interfacedisplay ipv6 interface tunnelnumberAvailable in any view
