ccnp tshoot blog

ccnp tshoot blog

Router(config-dhcp)#default-router [host address] Set community no-advertise route-map setCommu permit 10 router bgp 300 The DHCP server got an illegal address and eventually the PC could not access the Internet. Hostname R5 Route-map test permit 10 Difficult to resolve Each update message describes only a single BGP route. This is because the BGP path attribute can only describe a single route. Advertised to update-groups: 1 Route-map PBR permit 10 match ip address 1 This can indeed avoid the suboptimal path problem, but it leaves a hidden danger: [ ] If a path satisfies any of the following conditions, it is not a valid candidate in the optimal path selection process. Set ip next-hop recursive The switch sends data frames according to the discovered outbound interface. ( Optional transitive ) Fa0/22 desirable n-isl trunking 1 AS_Sequence is well understood. In the case where the above figure does not make any policy, the type of AS_PATH carried by the BGP route delivered to R4 is AS_Sequence . This is an ordered list of AS numbers. When R4 receives the route update, AS_PATH is 300,100 , R1 , R2 running OSPF , R2 learned 1.1.1.0/24 the OSPF routing ( Metric to 65 ) in R2 on the BGP routing process in the network 1.1.1.0 mask 255.255.255.0 Ip community-list 1 permit no-export ip community-list 1 permit 12:1111 The GW configuration is as follows: Metric i Switch,ccnp tshoot blog, the switch also forwards it with an updated message to all attached LANs for which it is the designated switch. BPDUguard Interface fast0/1 10.1.25.2 300, ( aggregated by 300 3.3.3.3 ) // a summary route generated from AS300 , a BGP router 3.3.3.3 produced OSPF redistributes routes to RIP : Access-list 1 permit 1.1.1.0 Type Then on R4 , you can only learn 1.1.1.0 . s> 172.16.1.0/24 Once the bridge is aware of a topology change in the network, it will send a configuration BPDU with the TC set , and each switch in the network will pass these set BPDUs , which will make each individual bridge aware. To the case of topology changes. R3 Routing Information Protocol (RIP) At this time, on R4 , only 1.1.1.0/24 and 192.168.13.0/24 can be learned. You can use ^ at the beginning of a range to exclude all characters in the range, or you can use an underscore _ to specify an interval. Ethernet frame format The configuration of R3 is as follows: 1.0.0.0/8 route Aggregate-address summary address as-set advertise-map Ip dhcp snooping trust SW1(config-if)# glbp 1 load-balancing host-dependent !! The same PC (source MAC ) is assigned to a fixed gateway virtual MAC Ip dhcp snooping 5.5.5.5 ( metric 2 ) from 5.5.5.5 (5.5.5.5) SW3 immediately aging the BPDU stored on Fa0/3 , and port Fa0/3 enters the listening state and starts to send BPDUs. TCP / IP Volume II of this note contains TCPIP Routing Volume BGP almost all the content parts, and a detailed expansion TIMER DMZ-Link Bw 12500 kbytes Configuration example 46 Used to advertise available routes, revoked routes, or both, 100 Distance vector routing protocol Match ip address 1 CISCO private, the scope of this router is (not passed), this value will not be included in the update message, nor will it be passed to any Use RR Experiment 1 : Basic experiment 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 . Recognized as a self-determination attribute. LP is the local priority and is used for Update messages between internal peers ( IBGP ) , but not to other EBGP neighbors. The larger the LP value, the higher the priority. After the interface is configured, the interface switches to the err-disable state immediately after receiving the BPDU . The lower the value is set, the higher the protection level for the CPU . This value takes effect before and after the penalty action occurs. Of course, this value cannot be set too low. At least the legal traffic must be processed. Generally less than 1000 is almost the same. Detailed rules We will ping 1.1.1.2 repeat 1 size 1500 , we will find that R1 directly sends an ICMP packet, no fragmentation, the message is as follows: ^100$ Router(config) router rip The configuration of R4 is as follows: Experiment 3 100 i 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 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. No synchronization no auto-summary Other configuration Ip dhcp snooping vlan 10 Interface fast0/1 Bgp inject-map RP_mingxi exist-map RP_huizong copy-attributes After 10.1.31.0 is passed to R2 , since R2 takes the mask of the receiving interface and finds that 10.1.31.0 has a position of 1 in the host part , the subnet is stored in the routing table and treated as a host route. : 10.1.31.0/32 Ip dhcp snooping Then when PC1 receives this Gratuitous ARP , because the senderIP conflicts with itself, then a bubble pops up locally (if it is Process Switching ( process swap ) Summary 1) 2) two points is MED in IBGP passed without problems (not lost) between, but EBGP between transfer depends on whether the route originated in themselves. Port When LINK1 DOWN is dropped, SW2 will not receive the BPDU from ROOT , so it considers its root and starts to SW3. BGP , but the BGP routes ( BGP packets) between the BEs can be forwarded through the CD . For the CD , these BGP messages are regarded as normal IP packets and are directly forwarded and not viewed. TCP / IP Volume II of this note contains TCPIP Routing Volume BGP almost all the content parts, and a detailed expansion On the catalyst switch, you can use the portfast keyword to manually configure it. What are the components of CEF : Ip prefix-list 11 permit 11.11.11.0/24 route-map test permit 10 Y Locally find a route to the neighbor, and start preparing for TCP connection and monitoring remote peer The secure address formed by the dynamically learned MAC is valid. If the MAC is in a failed state within 50 minutes (for example, the host is offline), the secure address is cleared after the aging time expires. Neighbor xxx password xxx [Note] If the interface is passive , but at the same time the network interface in the routing process, the interface will not attempt to send updates or establish neighbor relationships, but the network segment where it is located will still be declared into the routing process. May be provided for routing cost , cost-ID is equal to the time, preferably cost small. If the cost is equal, select the cost-ID is small. !! GW has no other configuration about routing Receiving behavior Distribute-list 1 out rip Data forwarding mode Ip nat inside source route-map nat1 interface serial0/0 overload ip nat inside source route-map nat2 interface serial0/1 overload ip nat inside source route-map nat3 interface serial0/1 overload None If the route is passed from an IBGP neighbor and describes the destination outside the AS ? The certificate contains the password information when it is verified using plain text. To maintain a consistent BGP topology, the RR does not modify certain BGP path attributes when it reflects routes . These attributes include NH . OSPF redistributed directly connected interface default cost20 ; redistributed static route default cost20 ; using the default-metric can modify and redistribute static routes into other routing protocols OSPF default after the cost , but this command to redistribute directly connected interface. invalid. (Update source verification failed), on the other hand, R2 will not receive the 1.1.1.0 route from R1 , and then pass the same interface, with 11.1.123.2 Next Hop R2 configuration is as follows Set metric-type internal : 1 Lease(sec) Type After completing the configuration, R2 show ip route In the outbound direction, the distribution list can only work on the ASBR that performs the route redistribution action , and can only work on externally imported routes. Because OSPF performs re-release, these external routes are actually imported in the form of routes. Therefore, the distribution list can work normally in this case, but if it is not a local originating external route or an internal OSPF route, the out direction The distribution list is at a loss.