ccnp tshoot guide

ccnp tshoot guide

Ip route 0.0.0.0 0.0.0.0 192.168.23.3 200 100 The DAI is deployed on the switch to ensure that legitimate ARP requests or responses are released and illegal ARP messages are discarded. The main actions of the switch after deploying DAI are as follows: BGP table version is 1, local router ID is 12.12.12.12 No confirmation mechanism, anyone can initiate an arp request or response 2.0 and 3.0 . Now we can by R2 deployment of a distribution list on the distribute-List , so that R2 update to R1 filter out routing information in BVI Bridge-Group Virtual Interface The number of addresses. The switch assigns MAC addresses in order 100 So R2 can ping through 3.3.3.3 The port mac of the Layer 2 switch is used here :) If an external route carrying a tag is advertised on R1 and OSPF is redeployed to EIGRP on R2 , then the route is advertised. The configuration of R3 is as follows: Network Next Hop Metric LocPrf Weight Path R2 's F0/0 port is configured with proxy ARP , 3.3.3.0 network R2 itself is reachable, so R2 will respond to this ARP request with its own F0/0 port MAC . In fact, this is an ARP spoofing behavior: ) Floating static route 23 Network 200 i ? Optimum and Distributed Switching And SW3 on the same case Ip route 172.16.1.0 255.255.255.0 192.168.12.1 Next Hop 2.2.2.2 If the route is learned from other neighbors, the default value (locally the route) is 0. Neighbor 10.1.13.1 remote-as 100 RIPv2 manual summary Send TCP packet The configuration of the DHCP server is a general configuration and will not be described here. Access-list 1 permit 1.1.1.0 Use RR Set ip next-hop ip1 Set ip next-hop ip2 0.0.0.0 1 Version Mode IBGP non-equivalent load balancing Implementation of CEF Port-channel Ethernet Channel of interfaces 2bb4c2a1 protocol Fa0/20 Send Keepalive bag Option82 and related issues in a non-relay environment Known via "ospf 1", distance 110, metric 20 Enhanced Interior Gateway Routing Protocol (EIGRP) Open Shortest Path First (OSPF) Understand the invalid arp entry Bgp confederation identifier 345 This command is used to tell the AS outside the federation . My local AS number is 345. Configuration last modified by 0.0.0.0 at 3-5-93 00:11:48 Ip address 192.168.10.254 255.255.255.0 However, for sticky entries, the aging time is never activated and it will not age. Ip address 10.1.25.2 255.255.255.0 BGP table version is 1, local router ID is 4.4.4.4 200 300 16 bits This feature is quite unstable and is not recommended. We know that the AD value of a static route is 1. The above configuration method actually changes the AD value of the static route to 10 . In this way, we have two default routes, one for the telecom exit, the AD value is the default 1 ; the other points to the education network exit, and the AD value is 10 . Then after None Difficult case 60 Full IBGP interconnection between route reflectors in the AS If the topology is normal, SW3 has an interface that is BLOCK . This interface will not send BPDUs . 2> Dynamic inbound soft reset 10.1.13.1 / / Modify the default parameters The federated AS number in AS_PATH is used to avoid loops within the federation On a specific interface, if no BPDUs are received for three consecutive cycles (or max-age timeout), the STP data on the interface will age rapidly. As a result, the BPDUs are somewhat similar to the keep-alive mechanism between switches . This fast aging mechanism helps to respond quickly to topology changes. A advertises the detailed route to B , B advertises the detailed route to C and D , and C advertises the summary route. At this time, the summary route will be transmitted to B in addition to being notified to D , and this may cause problems. Therefore, you need to filter the summary route on the IP distribution-list x of neighbor B on C. Otherwise, a routing loop will occur. AS_SEQUENCE exactly the same, except that the list of AS numbers belong to the local Federation AS SW3#sh int tru Configure native VTP mode Knowledge review Ip dhcp pool BIND Family Identifier ) 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. 2 : RIP-2 ; Unused RIP DAI configuration policy Router ospf 1 200 i At the time, it is already " 200 i ", so doing prepend can only be inserted in front of 200 i , please pay attention to the difference from the previous one. Match ip address 1 Conditional delivery of default routes Local origin Looking at the above picture, we made a manual route summary on R3 . This summary route was generated by R3 and passed to R4 . At this time, the AS_PATH of this summary route is 300 , and the detailed route under it is lost. AS_PATH attribute, then if R4 and R1 or At this time, by default, R2 can learn 1.0 , 2.0 , and R1 can only learn 2.0. PVLAN configuration example Network, which is consistent with topology expectations, but the underlying cause is still due to the learning of R2 compared to IBGP routes from R3 . Apply the configured ARP ACL to the DAI. A route-map defined on the interface . In this way, only the PBR action will be performed on the traffic entering the interface . The traffic originating from this device is invalid. Show ip dhcp binding Show dhcp binding on DHCP server RIP update behavior R2#sh cef interface s0/0 policy-statistics input Serial0/0 is up (if_number 4) Manually modify the hop count of RIP . First configure matching routes Ip dhcp snooping trust Route-map BGP2OSPF permit 20 match ip address 2 Community And the preferred order is: i > e > ? In the route-map in the set community RIPv1 , v2 The packet is captured as follows ( R3 sends the BGP update package to R4 ): Match as-path 1 Then observe the BGP table on R4 : *> 100.0.2.0/24 None Established (64512) 1 i Interface fast0/1 Network Configuration and implementation Experiment 1: host-dependent Solution: Modify the routing protocol administrative distance If the outbound interface is a broadcast interface, it may impose an additional burden ( ARP ) on the nodes under the interface or cause potential problems. Vlans allowed and active in management domain Manual network through BGP , which originated from IGP , because BGP network must guarantee the network A non-reflector router can participate in IBGP full interconnection or as a reflector client. Route Dampening The BGP configuration of R4 is as follows: Policy accounting is enabled on an input interface, and counters based on parameters such as community list, autonomous system number, or autonomous system path are assigned to identify the IP traffic. Switch(config-if)# spanning-tree portfast [trunk] We found R4 on the R3 passed over 100.0.1.0 this route, AS_PATH to 100 100 , from R5 over is 200 , apparent from R5 to the routing AS_PATH shorter, it is preferred by R5 to R2 route. A non-reflector router can participate in IBGP full interconnection or as a reflector client. Therefore, from here we can see that the route summary is a risk of looping. One way to solve the above problem is to add a static route on the Layer 3 switch: ip route 192.168.0.0 255.255.0.0 null 0 , this way, when it receives access If multiple path originating router IDs or router IDs are the same, then the shortest path of the Cluster-List is preferred . AAAA03 SNAP (fixed value) * RouterID : 1.1.1.1 Access-list 1 deny 192.168.13.0 access-list 1 permit any In CEF , there are two main types of load balancing, based on messages and based on purpose. ? R2#sh ip route case study Neighbor 4.4.4.4 remote-as 345 TYPE : 1-open ; 2-update ; 3-Notification ; 4-keepalive ARP response packets can be sent directly without a request, which leaves a huge loophole for the attacker. No synchronization 7 //The effect is the same as above ? Generally seen between switches or between switches and routers and servers AS_SET : A list of unordered AS numbers on a path to a particular destination Where min ( holdtime ) is the minimum value of holdtime between two BGP neighbors. SW1(config-if)# switchport native vlan 1 Interface vlan 10 Of course it includes information such as object MAC address , contents of the destination interface . In this case we need only one data stream (Flow) in the first packet do process Peer using Route-map in the case of ) : AS_PATH several commands BPDU sending bridge ID ? In RIPv1 based on the increase Used to announce aggregated and selected detail routes (suppress specific detail routes), followed by route-map xxx , matched by route-map In the establish state, the status prompt is not displayed, and a number indicating PfxRcd is displayed , that is, the prefix entry received from the neighbor. Redistribute connected route-map test Interface level commands. By limiting the number of ARP packets received on an interface , you can prevent the switch that enables DAI from being attacked by the DoS . Precautions: 1.1.1.1 (metric 129) from 4.4.4.4 (4.4.4.4) Switchport port-security mac-address sticky 100 C 192.168.23.0/24 is directly connected, Serial0/1 Faster Aging of Information 10.1.13.1 Alternate port: Discard status. In addition to the root port and other ports to the root path, if the active root port fails,ccnp tshoot guide, the replacement port becomes the root port, so the alternate port can be understood as an alternative to the root port. / / This is used to match 11 routes In the routing table of R3 , there is only 1.1.1.0 route. 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. As an update source, send it to R3 . The EBGP neighbor learns 2.2.2.0 . The RIP management distance is 120 and the EBGP is 20. Therefore, EBGP routes are preferred . How to make R1 preferred RIP Interface vlan 100 Experiment 2: weighted //The details are not released. + What happens to the two-way re-release of RIP to OSPF on R3 ? We assume that the configuration completed on R3 , the route 192.168.1.0 will be injected into OSPF by R3 , and will be updated to R1 , and then updated by R2 to R4 . At this moment, R4 learns this from both OSPF and RIP . Routing, what would it do? Of course, OSPF is preferred because AD is small, so in its routing table, the route about 192.168.1.