ccnp 300-101 route dumps

ccnp 300-101 route dumps

Holddown timers are ignored in some versions of IOS , that is, they do not take effect even if they are set. Fa0/20 Run RIP between R1 and R2 (declare direct connection and their respective LOOPBACK ). At this time , the update package sent by R1 has the source address of 192.168.12.1 . LocPrf If the above is replaced by EIGRP , the phenomenon is the same as RIP , R1 will declare 1.1.1.0 into EIGRP. To configure globally, use the command: SW3(config)# spanning-tree portfast bpduguard default , which activates bpduguard on all interfaces that activate the portfast feature : R1 and R2 establish EBGP . On R1 , the network announces 11 and 12 network segments. To filter out 12 network segments, do not let them pass to R2 . The range is 10 - 1000000 Apply ARP ACLs to DAI For different routing protocols, the corresponding AD values ​​are shown in the table below. This is a well-known convention: RSTP has made minor modifications to BPDUs only on an 802.1D basis : In a DHCP snooping environment (deployed on a switch), we consider ports as either trust or untrust , which is a trusted or untrusted interface. On the switch, configure the interface connected to the legal DHCP server as trust . Only received on the trust interface On the debug information we found: For R2 , it is now in its own process 1 , while learning the route of this OE2 from R1 and R3 , how will it choose? Review Origin Commands For example , the configuration of R3 is as follows: Path IBGP horizontal segmentation R2#sh cef interface s0/0 policy-statistics input Serial0/0 is up (if_number 4) Use the dynamically learned MAC address to form a secure address entry. PROTOCOL port-security does not support etherchannel the port-channel interfaces C and D are not aware of 1.1.1.0 (they only run OSPF , not running BGP ), and thus become a routing black hole. Note that although the CD is not running 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 . Switch(config)# vlan 255 Switch(config)# interface fast0/1 Vlans in spanning tree forwarding state and not pruned Switch(config-if)# switchport port-security aging time ? Now we consider that when R1 originates an OSPF internal route, both R2 and R3 can learn this route. Then on R2 , the route is re-released from process 1 to process 2 , and finally R3 will learn the route from R4 . So for R3 , the dual OSPF process, No-advertise no-export For the contents of this section, please refer to the relevant chapters of the path properties of this document. 100.100.100.0 [20/0] via 10.1.23.3, 00:02:57 Administrative distance problem Configuration Example 3 (at a single routing protocols -OSPF ) Circuit-ID type 192.168.1.0 the OSPF routing but will be re-injected into the RIP (because we deploy a two-way re-release), this is the route Feedback , the route was filling back. Sw(config)#interface fa0/24 Configuration example 46 Associate route-map when route is re-published RIP-2 MD5 Authentication 100 Origin IGP, metric 0, localpref 100, valid, external, atomic-aggregate , best Example of multiplication characters: Origin IGP,ccnp 300-101 route dumps, metric 0, localpref 100, valid, external, best This is the typical recursive route of BGP . The next hop of the 3.3.3.0 route on R1 is 2.2.2.2 , further recursive 2.2.2.2 , and the associated outbound interface S0/0. 100 i If an OSPF in- process route cannot be summarized: Next turn on DAI on SW1 : Switch(config)# spanning-tree vlan vlan-id priority pri 3.3.3.3 SW1(config)# interface vlan 10 30.30.30.0/24 ! If the route is passed from an IBGP neighbor and is introduced by the BGP router in the AS Passive: passively wait for other side to ask The Layer 2 interface contains access mode and trunk mode that we are very familiar with . All physical interfaces of the switch are Layer 2 interfaces by default, which is switchport . 200 i R2#show cef interface f0/0 FastEthernet0/0 is up (if_number 4) Private VLAN concept Ip default-network 108 What is an invalid arp entry: 10.1.23.2 RA(as200) RB(as100) RC(as100) IP The TAG field ( 32bits ) is only present in the external LSA . The route -map used by exist-map has at least the following two match statements: The redistribute local route learned from the IGP routing protocol enters BGP , and the MED value inherits the metric in the IGP protocol. ip route 172.16.1.0 255.255.255.0 192.168.12.1 !! go subnet route BPDU There are two types: configuration BPDU and TCN Note that if you attempt this time SW2 on F0 / 2 interface priority piecemeal, and it is useless, because the port is looking at the sender ID . So if on SW1 , the port priority of F0/2 is reduced. Then on SW2 , F0/2 will win as the root port. Path Control Overview ? Refcount 6 R3 announces 192.168.1.0 , 2.0 , and sets the community attribute of 1.0 to no-adv. Interface fast0/24 Next, let's take a look at several exchange methods. Some of the contents of this section are excerpted from the network, thanks to the original author's sharing. Ip route 172.16.0.0 255.255.0.0 192.168.23.3 DHCP relay Show ip bgp flap [123].[7-9] Set community no-export additive Two-way re-release of OSPF and RIP Metric Regular expression example: R1 , R2 , and R6 advertise the routes of their respective ASs through EBGP . In AS345 , these routes are re-advertised into OSPF , and then advertised back to BGP on the other two routers , and then advertised to their EBGP peers . . RIPv2 35 *>i11.11.11.0/24 Vlan 10 Route tag 9 R1 and R2 run OSPF , and announce the direct connection network and their respective LOOPBACK interfaces. R1 LO1 is 1.1.1.1 and R2 LO1 is 2.2.2.2. Obviously, the DHCP server is aware of the above problem, and the action it takes is to ignore this DHCP request. Therefore the PC cannot get the address. *Mar 1 00:11:48.043: ICMP: echo reply rcvd, src 2.2.2.2, dst 192.168.123.3 LocPrf SW1(config-if)# ip address 10.1.1.253 255.255.255.0 It is actually an order with the following, so knocking in, show has become the following stuff. The Ip helper-address command is configured on the Layer 3 interface that receives the broadcast discovery packet sent by the client , or "blocks" the broadcast DHCP packet. For example, if it is a Layer 3 switch, use the access. interfacing PC , then you should configure the VLAN 's SVI interface. OK Route . 3 : the AS_PATH : 500 the MED : 150 External RouterID : 172.16.13.1 Ip route 192.168.10.0 255.255.255.0 fast 0/0 Metric Holddown timers are ignored in some versions of IOS , that is, they do not take effect even if they are set. 300, ( aggregated by 300 3.3.3.3 ) // a summary route generated from AS300 , a BGP router 3.3.3.3 produced Virtual-PPP Virtual PPP interface Netflow switching Weight 192.168.1.0/24 , RIP only declared the direct link (without having to declare that in the process the Loopback ), the R1 on ip defaut-network 17:57:27 Complete the basic interface IP configuration . Add the following configuration on R2 : 100 / / Set the interface mode to Trunk mode 10.10.10.0/24 R2 will use the primary address and the secondary address for validate-update-source , so R2 can learn 2.2.2.0 and 3.3.3.0 routes. DHCP relay experiment RFC1771 A Border Gateway Protocol 4 Edge port edge ports Metric If the ibgp keyword is not associated , only EBGP routes will be equivalently load balanced (by default only for EBGP routes). If maximum-paths is not configured , the next routing principle will be followed. [abcd] Network Trunk overview Local origin !! The red font part is the number of hops to be increased 10.1.13.3 Route filtering or execution strategy during redistribution : Enabled If the local end has this feature enabled, the next-hop device does not support CDP , then switch to the next next-hop . If there is no next-hop , skip the PBR. Match tag 10 Experiment 1 Ip route 0.0.0.0 0.0.0.0 192.168.12.1 Manual bindings are IP addresses that have been manually mapped to the MAC addresses of hosts that are found in the DHCP database. Manual bindings are stored in NVRAM on the DHCP server. Manual Show ip bgp dampening 10.1.23.3 from 10.1.23.3 (3.3.3.3) Router bgp 200 bgp dmzlink-bw *> RIP and OSPF Display has not been loaded into the RIB in the BGP routing, and why not loaded Neighbor IBGP_peers update-source loopback0 neighbor IBGP_peers password cisco Alternate port: Discard status. In addition to the root port and other ports to the root path, if the active root port fails, the replacement port becomes the root port, so the alternate port can be understood as an alternative to the root port. The rules for BGP next-hop are as follows: The implementation of diversified strategies at the level has been able to achieve very good path control effects, and it is a very scientific and highly recommended method to control the flow of data by controlling routing. In addition to this, there are many, such as: IS-IS For the same BGP connection, the passwords must be the same; different neighbors can set different passwords. After the authentication is configured, all data segments transmitted through the TCP connection between the peers are verified. FIG above, R1 to R2 update 1.1.1.0 , . 1 hop, when R1 DOWN off, and R3 to R2 update 1.1.1.0 is . 5 hopping, R2 up to R1 route will vary with invalid timer expires becomes pdown State, then enter the timer of the holddown timer To this end, some organizations and manufacturers propose to layer the data link layer, which is divided into logical link control sub-layer ( LLC ) and media access control sub-layer ( MAC ). Such different physical layers correspond to different MAC sublayers, and the LLC sublayer can be completely independent. As shown in Figure 1-4 . Y Experimental verification ( IBGP equivalent load balancing) 100 The cost of the route. Penalty value: 1000 per swing Ip route 0.0.0.0 0.0.0.0 192.168.23.3 Virtual-PPP Virtual PPP interface ! Set ip next-hop { ip-address [...ip-address] | recursive ip-address } Route-map test permit/deny 10 Redistribute ospf 1 match internal external 1 external 2 Arp replies sent: 3 Forwarder 2 The above command only re-advertises OSPF external routes E1 and E2 into BGP. Switch(config)# vtp domain cisco Gateway of last resort is 172.16.12.1 to network 192.168.1.0 TCN BPDU Neighbor R3 filter-list 2 weight 5000 Offset-list offset list 78 ^(100|200)$ Router os 1 1 : Request message, requesting all or part of the routing information from the neighbor; Once the port-channel interface is established, it forms a logical interface, and subsequent configuration of the interface is in the port-channel. // There are routes in the routing table of R3 : 1.1.1.0 , 2.2.2.0 , 192.168.12.0 Note inconsistent with err-diasble difference is, ERR-disable will disable off the entire interface, and inconsistentport is for a particular VLAN 's. Neighbor 10.1.12.2 remote-as 200 Then just republish this static summary route into OSPF . In this way , the routers in OSPF can reach through this summary route. Async Async interface Instead of choosing R3 ? This is determined according to the routing principle of BGP (see the BGP document of Red Tea Three Cups Zhu SIR ). Here, the final impact of routing is such a rule "preferred routing from EBGP neighbors (relative to IBGP neighbors) "), R2 is the EBGP neighbor of R5 , so it is preferred. DHCP option 82 , also known as DHCP relay agent information option ( Relay Agent Information the Option ), is the DHCP option in the packet, which numbered 82 The Spanning-tree portfast feature cannot be configured directly on the trunk mode interface, otherwise the CISCO IOS will not take effect even if it is configured , unless the interface becomes access mode. If you really need to configure on the trunk interface, for example, if the interface is connected to a server that supports trunks , then add the trunk keyword to the Spanning-tree portfast command .