how to master ccnp route rene molenaar

how to master ccnp route rene molenaar

Neighbor 5.5.5.5 update-source Loopback0 no auto-summary UDLD mode of operation None The dst-mac detects the received destination ARP packet. The destination MAC address of the Ethernet frame header is the same as the target MAC address in the ARP body . This check is for ARP response . When this option is enabled , ARP packets are discarded if the two MAC addresses are inconsistent. The idea of ​​configuration is that on R2 , you want to grab the fast0/0 port (that is, the one sent by R1 ) and go to the traffic of 30.30.30.0/24 . Verify again, instead of detailed routing, use a summary route of ip route 10.0.0.0 255.0.0.0 , the next hop is R3 , the effect is the same as above, also take R3 . Therefore, as long as it is not the default route, as long as there is such a matching route in the routing table, the route is taken preferentially, and the route-map is taken without the route . Is 2 , 3 with AS the first comparison, 2 is MED small it is preferable; 2 with a further comparison, since the opening of the always-compare-med Virtual-PPP Virtual PPP interface Maximum route entry Timer verification 5.5.5.5 There are class, classless routing protocol redistribute BGP has three management distances, 200 learned from IBGP and 20 learned from EBGP . This is because the design concept of BGP works. Nowadays, routing is almost as fast as switching, and it can also be forwarded based on hardware. At the same time, the routing design solves the Layer 2 loop problem of the switching network and the isolation problem of the LAN . The message contains: Incomplete ? Learned from other sources (confirm that the source of the route is incomplete), the re-routed origin is the tag Route-map test permit 20 router bgp 200 Since the AS_PATH attribute does not change within the AS (only when the route leaves the AS ), the AS inner loop has a horizontal splitting mechanism, and the route reflector actually relaxes the horizontal splitting principle . This will bring some hidden dangers to the loop. Therefore, the route reflector needs to use the following two attributes to prevent loops: Define a maximum value: define the maximum number of hops 15 hops, 16 hops unreachable to avoid routing loops MED Fa0/20 LocPrf In addition: when the spanning tree reconfigures the new root port,how to master ccnp route rene molenaar, other interfaces flood the network with Trunking R3 and R4 , R4 and R5 establish IBGP neighbor relationships, and R3 R4 R5 uses LOOPBACK as the update source and refers to the neighbor . 5.5.5.5 Fa0/20 100 Router bgp 345 O 2.2.2.2 [110/65] via 10.1.12.2, 00:05:16, Serial0/0 C 1.1.1.0 is directly connected, Loopback0 2.0.0.0/32 is subnetted, 1 subnets And the preferred order is: i > e > ? Additional instructions: Switch(config)# vlan 20 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. Switched network management The main routing table version is injected into the last table version in the main routing table. Incomplete ? Learned from other sources (confirm that the source of the route is incomplete), the re-routed origin is the tag Preferred routes sent by EBGP neighbors (relative to IBGP neighbors), preferred federated EBGP routes in federated EBGP and IBGP Aggregate-address 192.168.0.0 255.255.0.0 as-set advertise-map adv Neighbor 10.1.23.3 dmzlink-bw Configuring a VTP domain name 1 i Note that at this moment, although SW1 trims the traffic of vlan10 on the fa0/20 port , the fa0/20 port of SW3 does still release the traffic, but in any case, the PCs cannot communicate with each other. Demonstrate, know the role of allowed vlan . Of course, this is the way to manually trim. : ccnp The above match statement is used to match the neighbor IP that sent the summary route . If you specify a copy attributes option, is inject the specific routes will inherit the path attribute of the aggregated route, or breakdown will be as locally generated routes. Show ip bgp 10.10.10.0 on R3  open Interface fast0/1 When the GW loses the route to 10.1.12.2 and the connection to ISP2 is also lost, then the default route is taken. Or trunk Situation 2 Written in front of the words: Neighbor 10.1.12.2 route-map test out Displays all BGP routes received from the specified neighbor (original route before the local inbound policy is executed) 14 Switchport mode private-vlan host Via 10.1.13.3, FastEthernet1/0, 0 dependencies Preemption enabled, min delay 30 sec Commands In the above figure, there is a Layer 2 link between the customer and the carrier network. If the client's device is elected as the root bridge for some reason, it is troublesome. Therefore, the rootguard feature can be used to connect the client to the interface of the carrier. Deploy on. Then when these interfaces receive better from the customer Port Security : Enabled The security address entry thus formed (which is SecureSticky ) will not be lost even if the interface is flipped. If wr saves the configuration and the command is written to config.text , the security address will not be lost even if the device is restarted. Next Hop Clear ip bgp {neighbor-address} As mentioned earlier, DAI performs ARP legality verification by means of the DHCP snooping binding database . Another basis for legality verification is the manually configured ARP ACL . Ip address 3.3.3.3 255.255.255.0 Bgp confederation identifier 345 bgp confederation peers 64512 neighbor 4.4.4.4 remote-as 64512 32768 No synchronization no auto-summary 30.30.30.0/24 R1 and R2 run IBGP , use LOOPBACK as the update source, and refer to neighbors . R2 and R3 are EBGP relationships. R3 announces 3.3.3.0/24 into BGP , and configures next-hop-self for R1 on R2 . *>i10.1.12.0/24 To summarize on R3 , use aggregate-address summary-only as-set , then the BGP table on R3 : The cost of the route. In other words, R1 is not required to have a default route locally. Slot Slot unit 0 VC -1 If the currently configured keepalive timer is greater than min ( holdtime ) /3 , then int[min ( holdtime ) /3] R1 and R3 , R2, and R5 establish an EBGP neighbor relationship. HOLDTIME CISCO defaults to 180s ( 3 times KEEPLIVE timer ), which is included in the open message. R1 and R3 , R2, and R5 establish an EBGP neighbor relationship. Routing, accept updates. Second, rule 9 , 10 skips Delete a specific community value in the community list * i100.0.1.0/24 INDEX This port is the peer switch source port so the ISL frame is up to 1548bytes ( 1518+26+4 ) neighbor to mean), BGP The network command, only the local routing loaded into BGP one way process. federal Auto: passively wait for other side to ask As shown above, the position of the line is 16+4=20 , so we get the summary address: 192.168.0.0/20 , which is the most accurate summary address. Ip as-path access-list 1 permit _600$ route-map setCommu permit 10 R4#sh ip b When a BGP router sends a route update to its EBGP neighbor, it cannot carry the LP attribute. The LP value of the EBGP route received by the other party is null (even the LP field is there), but it will assign a default to this route locally. Value, that is / / This is used to delete the no-export attribute, is a list of commands So if we use a solution that re-releases static summary routes: Standby is 10.1.1.252, priority 100 (expires in 7.572 sec) R2 will "translate" the two OSPF routes 3.0/24 and 4.0/24 into RIP and pass it to R1 . R1 will also be able to learn 3.0 and 4.0 routes. Note that the re-released execution location is performed on R2 , that is, at the demarcation point of the routing domain. In addition, the route re-distribution is directional. For example, after we have performed the relevant action, R3 still has no R1 route. Need to further re-publish the RIP route on R2 .