ccna objectives 200 301

ccna objectives 200 301.(4) Configure router R4 R4(config)#ip route 4.4.0.0 255.255.252.0 nullO Construct this summary route in the IGP routing table; otherwise, you cannot advertise this summary route in BGP with the network command R4(config)#router bgp 200 R4(config- router)#bgp router-id 4.4.4.4 R4(config-router)#neighbor 34.34.34.3 remote-as 100 R4(config-router)#network 4.4.0.0 mask 255.255.255.0 R4( config-router)#network 4.4.1.0 mask 255.255.255.0 R4(config-router)#network 4.4.2.0 mask 255.255.255.0 R4(config-router)#network 4.4.3.0 mask 255.255.255.0 R4(config-router)#network 4.4.0.0 mask 255.255.252.0 The network command is used to advertise summary routes. In BGP, the network command can advertise not only directly connected routes but also other route entries in the IGP routing table. In terms of function, the summary route can replace the four directly connected subnet routes advertised above. In this experiment, both summary routes and explicit routes are advertised, and practical applications do not require.382.Cisco Networking Lab CCNA Lab Guide (2nd Edition).1 A router can start only one BGP process. 2 The command neighbor is followed by the address of the neighboring router's BGP update source.(3) The network command in BGP is different from IGP in that it only advertises the route entries (either directly connected routes, static routes, or dynamic routes) that exist in IGP in BGP. Also the network command uses the parameter mask to advertise a separate subnet. If the auto-summary feature of BGP is not turned off and subnet routes exist in the IGP routing table, you can use the network command to advertise the primary class network in BGP, and of course, you can use the parameter mask to advertise a separate subnet. If the auto-summary feature of BGP is turned off, the announcements must strictly match the mask length of the routing entries via the parameter mask.4 The command neighbor followed by the update-source parameter is used to specify the BGP update source. If there are multiple paths in the network, establishing a TCP connection with a loopback interface and using it as the update source for BGP routes increases the stability and robustness of BGP.5 The next-hop-self parameter followed by the command neighbor is to address the issue of next-hop reachability for BGP routes because when a BGP route learns the next-way address through EBGP and is passed to an IBGP neighbor of this AS, the next-hop address obtained from EBGP remains unchanged for passing in IBGP. the next-hop-self parameter makes the the router to use its own BGP update source as the next-hop announcement to send BGP update information to its IBGP neighbors.6 The next hop of BGP is the next hop of the routing entry in the BGP routing table, which is the address referred to by the corresponding neighbor command. 4. Experimental Debugging(1 ) View TCP connection information summary R3#show tcp brief to view TCP connection information summaryTCB Local Address Foreign Address (state)64752BAC 3.3.3.3.11002 1.1.1.1.179 ESTAB