ccnp route boson

ccnp route boson

Routing Policy // EBGP neighbor Switchport mode private-vlan host For example, in R3 viewed on R5 sent me 6.6.6.0 of this OSPF external routes, you can see the tag field is 600 (automatically inherit the AS_PATH ) And this time, R3 the OSPF redistributed into BGP , the default is not automatically restored AS_PATH attribute, so you need: Several problems with VTP Prefix list is much more controllable than access list, supports incremental modification, and is more flexible 1.1.1.1 Route-map PBR permit 10 match ip address 1 Verify the role of the match interface 2 SW1(config-if)# switchport nonegotiate None If the penalty value exceeds the pre-set threshold - the suppression limit: the penalty value reaches this threshold, the route is suppressed, ie not released, until the N half-life, the penalty value is reduced to another threshold: re-use threshold (de-suppression threshold) ), the suppression of the route is lifted. Ip prefix-list 1 permit 100.0.1.0/24 route-map test permit 10 description RootGuard DHCP static address binding The ip community-list is also like ACL . There are standard and extension points, 1-99 is the standard, and 100-199 is the extension. Extended community-list In general, we believe that the attack behavior is mostly from the terminal's PC , which may be poisoning or hacking. Therefore , the interface connected to the terminal PC is configured as a DAI untrust interface, and the interface between the switches is configured as a trust interface. UDP On: channel member without negotiation ( no protocol ) The case of RSTP : Known via "ospf 1", distance 110, metric 20 *>i1.1.1.0/24 Let's take a look at R4 : Layer 2 switching Neighbor 4.4.4.4 update-source Loopback0 neighbor 10.1.25.2 remote-as 200 R1#show ip cef 2.2.2.2 internal ? Interface configuration: spanning-tree bpdufilter enable ! Bgp confederation identifier 345 neighbor 4.4.4.4 remote-as 64512 neighbor 4.4.4.4 update-source Loopback0 *Mar 1 00:11:47.999: ICMP: echo reply rcvd, src 2.2.2.2, dst 192.168.123.3 Router(config-router)# distance eigrp internal-distance external-distance If there are multiple routes from the same neighboring AS and multiple paths are available through Maximum-paths , all routes with the same cost are added to Loc-RIB. Rule example ? BGP stipulates that routes learned through one IBGP are not propagated to all other IBGP neighbors. This is the horizontal split rule of BGP . B 3.3.3.3 Snooping can protect against DHCP spoofing. On the other hand, it will get DHCP snooping binding on the switch. As the next hop to 100.0.1.0 and 2.0 . In the R4 on ? R1 and R3 , R2, and R5 establish an EBGP neighbor relationship. Sw1(config-if-range)#switchport trunk encapsulation dot1q Next hop 10.1.13.3, FastEthernet1/0 valid adjacency 86025 Ip community-list standard del permit no-export route-map test permit 10 After the data transfer is completed, A to B transmits a data frame to tell B releasable attachment, the communication ends. !! Do not write to option82 Neighbor 10.1.12.1 remote-as 13 The process of processing a VLAN frame by a trunk port is as follows: Configuration command BGP routing table entry for 172.16.0.0/16, version 4 DNS , WWW , and SMTP servers belong to the same subnet Show ip bgp on R3 The BGP router appends its AS number to the AS_PATH only when the update message is sent to another AS ( EBGP peer ) . This sentence also implies another meaning, that is, if you want to modify the AS_PATH attribute, you must execute the policy on the AS border router, and the policy of modifying the AS_PATH for the IBGP neighbor is invalid. Set metric 1111 When a data frame is sent from the Access port, the switch strips the VLAN tag of the frame and then sends it out. Next Hop Notifacation packets , resulting in session is interrupted; it can be re- AS on the border router IN strategic direction. 200 i !! wherein 2.2.2.2 is R2 of Router-ID , attention since 100.1.1.0 in R3 of OSPF R3 associates the route-map with the redistribution of the direct route 3.3.3.3/32 , tag#11 , and the route is passed to R2 . On R2 ,ccnp route boson, the redistribution of RIP to OSPF is deployed. After the external route of 3.3.3.3 is injected into OSPF , the tag value is carried by default. These policy-lists can be called in the route-map / / There is a S entry in the routing table After SW3 receives this message, it knows that SW2 no longer has vlan10 users, and no longer needs vlan10 traffic, so it will trim vlan10 on its own FA0/22 port : ? 30 Convergence comparison between 802.1D and RSTP 3.3.3.3 New link Link1 between A and Root Ip route 172.16.1.0 255.255.255.224 192.168.23.3 !! Press the longest match, go this one ! Metric Know (configuration is only done on the RR ). Note that the RR only advertises or reflects the best path it knows. Before the DAI is deployed , if the ARP spoofing behavior occurs on the intranet , for example, the PC sends an invalid ARP packet, the switch cannot detect and defend the defensive action. The LP field is all there, but it will assign a default value to this route locally, which is 100 , and then pass it to its own IBGP. ------------- s> 172.16.11.0/24 If R1 starts auto-summary and introduces 1.1.1.0/24 in the way of re-distribution direct connection , the subnet will be automatically summarized to R2. By default, only the MED values of BGP routes from the same neighbor AS are compared , that is, if the two routes of the same destination are from different ASs , the MED value comparison is not performed . MED only affects the traffic between directly connected autonomous systems, and does not pass through the AS . The smaller the MED, the higher the priority. Source of routing information: How is this route learned, for example, static, or through OSPF , IS-IS , Device ID Router bgp x None Next Hop Topology change mechanism (delivery) 10.1.23.2 from 10.1.23.2 (10.1.23.2) 100 0 0 In summary, for IBGP to work properly, you must implement one of the following configuration options: In the above example, the phenomenon we mentioned, R4 will know the route from OSPF and RIP to 192.168.1.0/24 , and finally R4 will choose OSPF route. This is a phenomenon we don't want to see in this environment, because it creates a sub-optimal path. The AD values ​​for several common routing protocols are listed below: This type of data transmission service does not need to establish a connection, but it adds an acknowledgment mechanism to the transmission of data, which greatly increases the reliability. Response message and check Route 1 : AS_PATH : 500 *Mar 16 17:09:21.858: DHCPD: relay information option exists, but giaddr is zero. The Length field defines the number of bytes that the Data field contains. LocPrf If the BGP route is learned from other BGP peers , the MED does not carry the MED when it is advertised to the EBGP peer . Network 20.20.20.0 mask 255.255.255.0 Match ip address 1 Router bgp 100 Passive-interface 50 Private-vlan association 101,102 When a data frame is sent from the Access port, the switch strips the VLAN tag of the frame and then sends it out. Router bgp x Path New link Link1 between A and Root 10 FastEthernet0/1 BGP routing table entry for 172.16.0.0/16, version 4 * Experiment continued, after the above configuration, R4 has passed BGP learned from the R1 two of BGP routes. Apply the configured ARP ACL to the DAI. When the route-map is executed, the match statement contained in the policy-list called by it will be traversed and the match action will be executed . Matching as long as the contents of a , b , c , d appear 8 bits Router bgp 345 The election of the root port, SW2 and SW3 are relatively simple. The key is SW4 . There are two interfaces. Both interfaces will receive BPDUs . First, the root cost is seen . Because the root costs of the two BPDUs are equal, and the bandwidth of the SW4 interfaces is equal, this is the same.