ccnp tshoot final v7

ccnp tshoot final v7

( 0xFFFF0000-0xFFFFFFFF ) is a reserved community value. In addition to these values, several well-known values ​​such as no-export , local-as, etc. are defined. For specific values, see RFC . Both Learn Server, however, if there is a private DHCP server in the intranet , then it will affect the network, for example, the client is private. Port Redistribution will only perform re-release actions on routes in the routing table. Route-map test permit 20 router ospf 1 / / used to match summary routes C and D are not aware of 1.1.1.0 (they only run OSPF , not running BGP ), and thus become a routing black hole. Note that although the CD is not running Interface vlan 20 Switchport access vlan 10 interface fast0/24 In the above output, the metric part of the red bold is the IGP metric that reaches the NEXT_HOP attribute address locally . We find that from R3 and R5 , the metric is 2 , then if we connect R4 to the interface of R3 , that is,ccnp tshoot final v7, F0/ 0 port OSPF * i Network Next Hop Metric LocPrf Weight Path Ip dhcp relay information trusted Therefore: the route is redistributed into OSPF , the automatically inherit these external routes BGP 's A_PATH property, note that only inherit AS_PATH ...... Neighbor 10.1.12.2 route-map test out 100 Isolated And the preferred order is: i > e > ? Distance vector routing protocol At the same time, R4 also received the 100.0 route introduced by R2 , but it was not passed to R3 . This is the principle of horizontal splitting of IBGP : " BGP routers will not pass IBGP to him and pass it to other IBGP neighbors." ? The BGP update package is as follows. You can note that the length of the AS is 2 , which is " 300 , 100 ". Note that this is an ordered list of ASs . 1.1.1.1 (metric 129) from 4.4.4.4 (4.4.4.4) Forwarder 1 State is Active After this time has elapsed, the route entry will become 16 hops, marking the unreachable route possibly down . Gateway of last resort is not set As a result, all three switches exchange VTP packets to inform them that there is a VLAN for accessing users . For VLANs that do not have users locally , they will be automatically trimmed. Let's take a look: Type Example 1 : Wherein SW1 is as follows: After receiving the packet check, R2 finds that this is the IP of the same subnet as the interface that accepts the update package , so accept this update. Therefore, this test, although the interface masks on both sides are different, but can accept each other's updates, and can also ping between 1.1.1.1 and 2.2.2.2 . We restore the experimental environment to the basic configuration: BGP neighbor relationships are as follows This can indeed avoid the suboptimal path problem, but it leaves a hidden danger: R4 has two BGP neighbors, where R3 is its federated IBGP neighbor and R5 is its federated EBGP neighbor. Interface vlan 100 0 ? Use the global configuration command: err-disable recovery psecure-violation Enable DHCP snooping on SW1 without going to no ip dhcp snooping information option , which is to insert option82 . The configuration of other devices is the same as the previous experiment. It is found that the PC cannot obtain the address . The debug message will be found on the gateway device, that is , debug on SW2 : relay information option exists, but giaddr is zero . The giaddr field means the IP address of the first DHCP relay agent that the message passed .