cisco ccna prep

cisco ccna prep

The O position 1 indicates whether the entry in the NA message overwrites the existing one, and the neighbor who receives the message overwrites the existing entry. The GW configuration is as follows: Related points Version The configuration of R2 is as follows: 1 : Request message, requesting all or part of the routing information from the neighbor; Async Async interface Size Do not send full router address in prefix advert Access-list 2 permit 192.168.3.0 (2) By default, the routing entry of 1.0.0.0 updated by R1 is ignored. After configuring ip rip receive v 1 on S0, you can learn. ! When both the primary and secondary addresses exist, RIP will use both the primary and secondary addresses as the source to send routing updates. So R1 and R3 will learn the routing update of 2.2.2.0 . But R3 ca n't learn 1.1.1.0 , on the one hand, because R1 sends updates to R3 and is ignored by R3. Access-list 1 permit 192.168.1.0 !! Connect the interface of CE2 Metric 0, originator 0.0.0.0, path 300, community , extended community So how do you perform an accurate calculation of the summary route ? Let's look at an example: In order to allow R1 to access the rest of the network, once and for all, send a RIPng default route to R1 : The configuration of R2 is as follows: Network 192.168.23.2 0.0.0.0 area 0 distribute-list route-map test in Valid lifetime 25 preferred lifetime 10 !! The two times are decreasing. When the preferred lifetime first reaches 0 , the status changes to [DEP] . When the valid time becomes 0 , the address is erased. Address-family ipv6 neighbor 2.2.2.2 activate Route-target export 234:2 IPv4- compatible address or Ipv6 enable Image Ipv6 address 2001:0001::FFFF/64 ! OSPF can let R3 learn 1.0/24 and 2.0/24 routes. RIP and IGRP the passive-interface does not send routing updates, but to accept routing updates Ipv route 2222::/64 fastEthernet 0/0 FE80::CE00:1AFF:FEE4:0 IPv4 Application The router interface is configured with new and old prefixes, and both are advertised. The old prefix has a shorter lifetime, so that the nodes in the station can use two addresses at the same time. When the old prefix fails, only the new prefix is ​​used. Switching is possible. Interface fast1/0 ipv6 enable RFC2080 Ipv6 address 2001:23::2/64 10.1.13.3 Se0/1 ! Valid lifetime 25 preferred lifetime 10 !! The two times are decreasing. When the preferred lifetime first reaches 0 , the status changes to [DEP] . When the valid time becomes 0 , the address is erased. :: Interface-level command to join a multicast group, that is, the interface becomes a member of the multicast group. Test description: ping FF04::1 on R2 , Fa0/0 on the outbound interface Image Image 2 : Reponse message, send all or part of its routing information, a Response DAD The destination IP address of the route can only be the address of the natural network segment. ! Ipv6 address 2001:0001::FFFF/64 Segment header Fragment Header (Protocol 44 ) Image ! The IP configuration is as above. The R2 interface is configured with two IP addresses, and both have announced that the entire network runs RIP . The extended header is optional. Only the function corresponding to the extended header is required, and the sending host adds the corresponding extended header. Install the IPv6 protocol stack. At this time, Win7 will automatically generate an ISATAP tunnel virtual interface: Configure RIP unicast updates: Ipv6 ospf 100 area 1 Image And fe80:0000:0000:0000: 0000:5efe : for private addresses with the 32 bits of the host's IPv4 address. ". Looks like there is a globally unique and private point, but more than 0200 found in the relevant draft of the IETF :5efe description, in my test environment, the system used on the Windows host is 0200:5ede , and the CISCO router uses 0000:5efe . No synchronization Undoubtedly, R3 will preferably OSPF the B route, since OSPF the AD small, so that R3 is formed suboptimal paths, which go B segment will choose R1-R2 -R4-R5 this path. Furthermore, in the routing table of R3 , the route on the B network segment is O , then even if R3 does a re-release from RIP to OSPF , the re-release is definitely a failure, because we have said before,cisco ccna prep, the routing protocol is heavy. The release will only live in the routing table, and the routing table on the B is OSPF , so the re-issue fails.