ccnp 300-115 notes

ccnp 300-115 notes

Paths: (1 available, best #1, table Default-IP-Routing-Table, not advertised to EBGP peer) Flag: 0x820 B is passed to its IBGP neighbor C (doing a reflector), then on C , the route NEXT_HOP is still the A router (update source IP ) The RRs have physical connections and establish BGP peer relationships. In the case where one of the RRs fails, the client still has an alternate connection. At the same time in the out direction, there is no problem. 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. The default keyword has a lower priority than the detail route. Bgp dampening Static routes VTP Operating Mode : Server Maximum VLANs supported locally 1005 Next Hop If the router accepts the parameters of the neighbor in the OPEN message, it will answer a keeplive message, and send the message for the period of 1/3 of the holdtime (but not less than 1S ). CISCO defaults to 60S . If the hold time is 0 after negotiation , the keepalive keep-alive message is not sent . Local origin 201 200 The Length field defines the number of bytes that the Data field contains. BGP policy Configuring a VTP domain name Receiving behavior Used in route-map , when some of the matching entry, and using the set command, the route-map used in a neighbor (e.g., out time direction), then to update the route to a neighbor, the BGP of MED properties will Inherit the metric value of these routes in the local IGP A router that does not support the route reflector function can act as a single router cluster or as a client RIPV1 operational behavior 32 Bgp bestpath med confed Catos port switch ID in the default priority 32 (priority . 6 th 'bit ) , the IOS switch default 128 (priority field . 8 bits) case study R4 In addition to matching 100 to 106 outside the AS_PATH BGP decision Router bgp 300 Synthesis example 1 : The weight of the BGP route generated by the local summary is also 32768. ? R3 and R4 establish IBGP neighbor relationship, and R3 on the OSPF routes redistributed into BGP Distance 130 2.2.2.2 0.0.0.0 1 There are two ways to perform an inbound soft reset: 1. Soft reset using stored routing update information 2 , dynamic soft reset ---------- Router bgp 123 R3 configuration is as follows Policy-list feature Comparison principle and configuration considerations R1(config-router)# neighbor 10.1.12.2 route-map rp out 200 i Administrative distance problem Do the following configuration on R2 and test it ( all tested in no ip classless and closed ip cef environment ): Access-list 1 permit any route-map PBR permit 10 match ip address 1 If you want to delete multiple communities (not all), you can write multiple items in one community-list , such as Redistribute rip subnets route-map test Peer state name command 1 At this time, actually R1 's loopback port to R2 needs at least 2 hops, then this time you need to configure both neighbor xxxx ebgp-mul 2 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 Show interface | include bia Secret level * i The length is 2 bytes, indicating the frame type. When the value is 0x8100 , it indicates an 802.1Q Tag frame. If a device that does not support 802.1Q receives such a frame, it will discard it. Neighbor 10.1.13.1 remote-as 100 ICMP redirect 8 The default keyword has a lower priority than the detail route. Interface f0/2 Management VLAN in a Layer 3 switch environment Marker : for detecting BGP loss of synchronization between peers, the message authentication, and in the case of supporting an authentication function if the message type is open or open message does not contain authentication message flag field is set to all 1 , When a network is directly connected, the interface is not "activated" and attempts to establish a neighbor relationship. BGP neighbor relationships need to be manually Experimental verification ( EBGP equivalent load balancing) The default is 32 Tiao 100 Enabled by default, if an interface DOWN up, BGP answer immediately suspended. 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 . Path description Let's look at the following example: R1#sh ip b Path BGP table version is 1, main routing table version 1 Must be zero 200 i Inject-map to use the route-map in Switchport access vlan 10 interface fast0/24 The description of several fields ( ISL header) in the above figure is as follows: 10.1.12.1 from 10.1.12.1 (1.1.1.1) By default, only one BGP process can be started on a single router and can belong to only one AS . DUAL AS allows us to run a secondary AS under the primary AS without terminal BGP connections , thus providing a mechanism for network migration. TYPE DHCP-SNOOPING VERSION 1 IP CEF turbo control turbo vector 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. 10.1.23.3 from 10.1.23.3 (3.3.3.3) 10.1.12.2 As OSPF2 create a route in the static summary routes ( the Null0 ), and static routes redistributed into OSPF1 modified OSPF1 administrative distance, the OSPF1 priority than OSPF2 administrative distance BGP has three management distances, 200 learned from IBGP and 20 learned from EBGP . This is because the design concept of BGP works. 100 i Holddown timers are ignored in some versions of IOS , that is, they do not take effect even if they are set. 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,ccnp 300-115 notes, 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. Ip address 192.168.10.254 255.255.255.0 / / Match the commu value to be deleted 10.1.12.0 [110/128] via 10.1.23.2, 00:06:40, Serial0/0 Local origin Then let's go to R4 and see: Milne 's packet was sent to Roo because he learned the wrong one. Data ( DATA ) IBGP non-equivalent load balancing Detailed rules The configuration of R2 is similar to the above. The key is to look at the configuration of R3 : Still looking at the picture, if the middle network is not a broadcast multi-access network, but a frame relay network, then it should be noted that the route received by C , Load distribution: 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 (refcount 1) We restore the experimental environment to the basic configuration: BGP neighbor relationships are as follows <0-4294967295> 32-bit tag value RSTP BGP of AS plan shown in FIG. Adding the summary-only parameter will only pass the summary route, and the detail route will be suppressed. The summary route generated in this case will lose the AS_PATH attribute of the underlying detail route , so there may be some hidden dangers. 8 bits Neighbor 5.5.5.5 update-source Loopback0 Write-delay Configure delay timer for writes to URL IBGP established between neighbors neighbor, in order to ensure the stability of neighbor relations, general use loopback interfaces to establish, because if you use the physical interface, the physical interface failure, neighbor relations DOWN up, and AS inside, the path may be redundant LOOPBACK routes between neighbors can be obtained through IGP and provide some routing redundancy (when physical lines are also redundant). When establishing a BGP neighbor relationship using the loopback interface , be sure to specify the source IP address to be updated .