ccnp 300-135 exam

ccnp 300-135 exam

BGP table on R4 : Note: Using the policy to modify AS_PATH can only be performed on its EBGP neighbors on the BGP router , because AS_PATH is only in the AS. Configuration example 58 100 i Neighbor 10.1.12.1 capability orf prefix-list send neighbor 10.1.12.1 prefix-list FILTER in Difficult to resolve The ethernet , fast ethernet , and serial interfaces of the Cisco 1600 , 1700 , 2500 , and 2600 series routers use fast switching by default . Understand the invalid arp entry Timer When ISP1 is down, and the GW does not detect it (that is , the interface of GW connected to ISP1 is not DOWN ), the traffic of PC access 100 is still thrown to ISP1 , which is disconnected. R 3.0.0.0/8 is possibly down , routing via 9.9.12.2, FastEthernet0/0 SW3 is small), so the interface connected to SW2 on SW4 wins and becomes RP . Route-map LP permit 20 match ip address pref 2 set local-preference 200 switchport trunk encapsulation dot1q switchport mode trunk Ip community-list 30 permit 300:30 route-map PA permit 10 The link has failed. Can also be understood as the maximum life of this BPDU , the default 20S The ETHERNET_SNAP standard was developed by the IEEE 802.1 committee to ensure interoperability between IEEE 802.3 LAN and Ethernet. 4.3.2 Message Type 35 Then just republish this static summary route into OSPF . In this way ,ccnp 300-135 exam, the routers in OSPF can reach through this summary route. CASE3 : If you want to modify the weight , let R4 go to 100.0.1.0 and go to R3 to go to 100.0.2.0 and go to R5 ? Then the configuration is modified as follows: Next Hop 5.5.5.5 (64512) 1 i Y Summary of 192.168.0.0/16 on R2 Several problems with VTP The cache extracts the destination interface , destination MAC address, etc. , which greatly speeds up packet forwarding. Compare by default from top to bottom EBGP load balancing is verified. Only when the routes originate from different EBGP neighbors in the same AS and meet the equivalent load balancing, you can configure the maximum-paths x to implement load balancing. For example , the configuration is based on different ASs . The command is also invalid BVI Bridge-Group Virtual Interface Metric 2 state changes, last state change 00:07:34 Virtual IP address is 10.1.1.254 Again, the following topology, the phenomenon is the same as above, pay attention to the summary route using the as-set keyword, the AS_PATH of the underlying detailed route will be put into {} , which is AS_SET . For the original attribute, it specifies the source of the route update, which has the following values: 3 jumps. * i100.0.1.0/24 Path control OSPFpassive-interface neither sends nor receives routing updates, nor does it send HELLO packets. The larger the Local_Pref , the higher the priority 3.0.0.0/24 is subnetted, 1 subnets RIP-2 Only Match ip address 1 802.1q Default route 108 !! Globally enable DHCP snooping !! GW has no other configuration about routing Port Access-list 2 permit 10.1.2.0 route-map cisco permit 10 *>i1.1.1.0/24 The metric is a value) BPDU format and operation Then, first R2's own routing table will change, 3.0 routing is filtered out, and R3 is the downstream RIP router, 3.0 can not learn. Community number in aa:nn format Add to the existing community Load balancing Ip route 192.168.10.0 255.255.255.0 192.168.1.1 ? V2 uses multicast 224.0.0.9 Both R1 and R2 are connected to the 2.2.2.0 network. At this time, R3 goes to ping 2.2.2.2 . Because the static route of the outgoing interface is used, R3 thinks that 2.2.2.0 is a locally connected network, so ARP request is sent , R1 , R2 , can receive the request message, and both respond to the request message (the premise two OSPF TAG Overview 5.5.5.5 100 BGP table version whenever the BGP table changes, this value is +1 Metric Set ip next-hop Hard reset Frame check sequence FCS Detailed rules 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 Priority 120 (configured) Router ospf 1 No BGP session will be established before xxx R4 selects R5 as the next hop to the 100 network segment. This is because the two routes are taken from R5 , the weight weight is 100 , and the weight of R3 is the default 0. Naturally, R5 is preferred, so R4 will The path is switched to R5 . Strange phenomenon: In the BGP table of R5 , there are only two routes advertised by R2 , and the 100.0 route from R3 is not passed to R5 via R4 . In other words, we expect that AS345 will have redundancy to 100.0 network. Remaining path (through R1 , Router bgp 64513 RIP also supports tags , but it must be version 2 . Offset list The main routing table version is injected into the last table version in the main routing table. The default priority is 32768, and the range is 0-65535 . The first 4 bits are the priority . The last 8 bits are used as the system id . The smaller the better , the multiple of 4096 . Http: Database agent URL Infinite Planning Principles Spanning-tree features 3 jumps. SW1(config)# interface vlan 10 (64512) 1 i IP Address MacAddress 1. where 3 means that my own network of | 1 Types of Option82 Penalty value: 1000 per swing DAI configuration command When the ARP packet received by the interface exceeds this threshold, the interface enters err-disable . You can manually restore this interface by using the shutdown no shutdown method. Alternatively, use the global command the errdisable recovery to have the interface automatically recover after a certain time interval. to sum up Auto: passively wait for other side to ask ^10[^0-6]$ Activates self-recovery of the err-disable interface due to arp-inspection violations . When the network is normal, the data is forced to go ISP1 , ping 100 remote network data to ISP1 Access-list 1 permit any route-map PBR permit 10 match ip address 1 RFC1723 defines several compatibility switches Access-list 1 permit 10.1.1.0 Switch(config)# spanning-tree [ vlan vlan-id ] hello-time sec Switch(config)# spanning-tree [ vlan vlan-id ] forward-time sec Switch(config)# spanning-tree [ vlan vlan-id ] Max-age sec Often used with the portfast feature on the interface for connecting to the host Network 192.168.23.2 0.0.0.0 area 0 distribute-list route-map test in The bigger the priority Ip address 10.1.34.4 255.255.255.0 Not advertised to any peer Local * Available routes (next-hop reachable ) Here, because there is an OSPF interval , and OSPF does not know BGP , the BGP attributes will be lost during the re-release process . Update message: contains the entire routing table, updated periodically Default 30s , RIP update cycle Second column > Optimal path selected by BGP algorithm Load balancing Router bgp 300 B 3.3.3.0 [200/0] via 2.2.2.2, 00:03:01 Length Match ip address 2 set metric 3 Ip community-list standard del permit no-export ip community-list standard del permit 100:11 16 bytes Metric=BW+DLY , where DLY is the accumulation of DLY along the inbound interface of the route , and BW is the minimum interface bandwidth. Obviously through DLY Not used (set to all 0s ) ( Well-known ) 10.1.13.1 In R1 the ip route 0.0.0.0 0.0.0.0 null 0 then re-released in a static routing process, but also to RIPng 39 Command summary 81 Manually modified. Ip mtu refers to the maximum value of the ip message. 192.168.2.0/24 Origin IGP, metric 0, localpref 100, valid, internal Originator: 1.1.1.1, Cluster list: 4.4.4.4, 3.3.3.3 To be a whole, that is, to see the cluster as a whole. In the above figure, we inject OSPF routes into RIP . Traditionally, you can only set metrics on all incoming routes . However, with route-map , we can associate a defined one when configuring re-issue commands. A good route-map , in the route-map , we can create different properties or actions for different routes by creating multiple serial number statements. *>i100.0.1.0/24 For link state routing protocols such as OSPF Ip detects whether the IP address in the ARP body is invalid or unexpected, such as 0.0.0.0 , 255.255.255.255 , and multicast IP address, which are considered invalid IP . SenderIP verifies whether the message is an ARP request or response . And targetIP only if the message is the ARP response will be verified when Connectionless packet transfer service RIP and IGRP the passive-interface does not send routing updates, but to accept routing updates R2 , R3 , aiming RIP create static routing domain summary route, point null0 , while only these static routes redistributed into OSPF , and indeed can play a sub-optimal paths to avoid the question, but: Use show port-security address to view the security address entries on each port-security interface. description The maximum number of seconds allowed before the HOLDTime router must receive a keeplive or update message ! At the same time, the two routes are marked in the BGP table: " *> ", indicating that the two routes are valid , and the best or optimal, best , so they will be passed to the IBGP neighbor of R3 . That is R4 Aging Type : Absolute SecureStatic Address Aging : Disabled Solution: Avoid the problem of sub-optimal routing by re-publishing static summary routes. LocPrf You must use neighbor in the BGP process to specify the BGP peer . They exchange routing information, as well as related attributes, not link status. Paths: (2 available, best #2, table Default-IP-Routing-Table) Not advertised to any peer Policy-list Not used (set to all 0s ) The road selection has met our expectations. RFC1723 defines several compatibility switches Blocking to forwarding state usually takes 30-50s (default 50S , ie 20+15+15 ), this time can also be adjusted by configuring the spanning tree timer. Create a secondary VLAN : Established Router b 300 Vtp pruning is off by default Non-exist-map tabel-map Neighbor 10.1.13.3 route-map test out Default route 108 Another role of Gratuitous ARP is that some manufacturers use it to prevent ARP spoofing. For example, on some routers, a Gratuitous ARP- based anti- arp spoofing solution is configured, and the router (interface) will send Gratuitous ARP at a certain interval , in order to refresh the arp table of the bottom PC to keep the gateway IP corresponding. The MAC is always correct, of course, this anti- arp solution is quite awkward.