我思科中文社区排错的全过程(多跳EBGP邻居为什么不能建立)

1、一:基本配置:R1#interface Serial2/1ip address12.0.0.1255.255.255.0 router bgp100no synchroniz ationneighbor23.0.0.3remote-as200 no auto-summaryR2#interface Serial2/1ip address12.0.0.2255.255.255.0 interface Serial2/2ip address23.0.0.2255.255.255.0R3#interface Serial2/1ip address23.0.0.3255.255.255.0 route

2、r bgp200no synchroniz ationbgp log-neighbor-changes neighbor12.0.0.1remote-as100 no auto-summary cracker(Jackson回复:往回复: cracker(Jackson回复:cracker(Jackson回复:往回复: InQ depth is 0 OutQ depth is 0 Sent Opens: Notifications: Updates: Keepalives: Route Refresh: Total: 36 1 0 0 35 0 36 Rcvd 1 0 0 35 0 Defau

3、lt minimum time between advertisement runs is 30 seconds For address family: IPv4 Unicast BGP table version 1, neighbor version 1 Index 1, Offset 0, Mask 0x2 Sent Prefix activity: Prefixes Current: Prefixes Total: Implicit Withdraw: Explicit Withdraw: Used as bestpath: Used as multipath: 0 0 0 n/a n

4、/a -0 0 0 0 0 0 Rcvd -0 Outbound Local Policy Denied Prefixes: Total: 0 Inbound -0 - Number of NLRIs in the update sent: max 0, min 0 Connections established 1; dropped 0 Last reset never External BGP neighbor may be up to 2 hops away. Connection state is ESTAB, I/O status: 1, unread input bytes: 0

5、Local host: 12.0.0.1, Local port: 32826 Foreign host: 23.0.0.3, Foreign port: 179 Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes Event Timers (current time is 0x28A7A4: Timer Retrans TimeWait AckHold SendWnd KeepAlive Starts 40 0 35 0 0 Wakeups 3 0 1 0 0 0x0 0x0 0x0 0x0 0x0 Nex

6、t GiveUp PmtuAger DeadWait 0 0 0 0 0 0 0x0 0x0 0x0 iss: 950014779 snduna: 950015509 sndnxt: 950015509 irs: 2875086737 rcvnxt: 2875087467 rcvwnd: sndwnd: 16194 190 16194 delrcvwnd: SRTT: 371 m s, RTTO: 665 m s, RTV: 294 m s, KRTT: 0 ms minRTT: 140 m s, maxRTT: 544 m s, ACK hold: 200 ms Flags: higher

7、precedence, nagle Datagrams (max data segment is 536 bytes: Rcvd: 70 (out of order: 0, with data: 36, total data bytes: 729 Sent: 40 (retransmit: 3, fastretransmit: 0, with data: 36, total data bytes: 72 R1#show ip bgp summary BGP router identifier 1.1.1.1, local AS number 100 BGP table version is 1, main routing table version 1 Neighbor 23.0.0.3 4 V AS MsgRcvd MsgSent 200 37 37 1 0 TblVer In