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BGP协议建立连接及使用ISDN备份卫星链路( 二 )

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四、BGP是否生效查询
1、使用命令：show ip bgp neighbors 查询bgp 状态 。（注重黑体）
tongji#sh ip bgp neighbors
BGP neighbor is 172.25.10.1, remote AS 65500, internal link
BGP version 4, remote router ID 172.25.10.1
BGP state = Established, up for 00:41:10
Last read 00:00:11, hold time is 180, keepalive interval is 60 seconds
Neighbor capabilities:
Route refresh: advertised and received(new)
Address family IPv4 Unicast: advertised and received
Received 1763 messages, 0 notifications, 0 in queue
Sent 1766 messages, 0 notifications, 0 in queue
Route refresh request: received 0, sent 0
Default minimum time between advertisement runs is 5 seconds
For address family: IPv4 Unicast
BGP table version 4, neighbor version 4
Index 1, Offset 0, Mask 0x2
1 accepted prefixes consume 36 bytes
Prefix advertised 6, suppressed 0, withdrawn 2
Number of NLRIs in the update sent: max 2, min 0
Connections established 3; dropped 2
Last reset 00:41:43, due to User reset
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Local host: 172.31.254.1, Local port: 179
Foreign host: 172.25.10.1, Foreign port: 11045
Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)
Event Timers (current time is 0x644BFAC):
Timer Starts Wakeups Next
Retrans 48 1 0x0
TimeWait 0 0 0x0
AckHold 45 39 0x0
SendWnd 0 0 0x0
KeepAlive 0 0 0x0
GiveUp 0 0 0x0
PmtuAger 0 0 0x0
DeadWait 0 0 0x0
iss: 1548750689 snduna: 1548751630 sndnxt: 1548751630 sndwnd: 15985
irs: 127891366 rcvnxt: 127892303 rcvwnd: 15985 delrcvwnd: 399
SRTT: 771 ms, RTTO: 806 ms, RTV: 35 ms, KRTT: 0 ms
minRTT: 568 ms, maxRTT: 1032 ms, ACK hold: 200 ms
Flags: passive open, nagle, gen tcbs
Datagrams (max data segment is 536 bytes):
Rcvd: 90 (out of order: 0), with data: 45, total data bytes: 936
Sent: 87 (retransmit: 1, fastretransmit: 0), with data: 46, total data bytes: 940
2、使用命令：show ip route (注重黑体)
tongji#sh ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is 172.16.5.200 to network 0.0.0.0
172.16.0.0/24 is subnetted, 7 subnets
C 172.16.4.0 is directly connected, FastEthernet0/0.4
C 172.16.5.0 is directly connected, FastEthernet0/0.5
C 172.16.6.0 is directly connected, FastEthernet0/0.6
C 172.16.1.0 is directly connected, FastEthernet0/0.1
C 172.16.2.0 is directly connected, FastEthernet0/0.2
C 172.16.3.0 is directly connected, FastEthernet0/0.3
S 172.16.100.0 [1/0] via 172.16.5.200
172.19.0.0/16 is variably subnetted, 11 subnets, 2 masks
B 172.19.10.0/24 [200/0] via 172.25.10.1, 00:57:53
C 172.19.101.24/30 is directly connected, Serial4/2
C 172.19.101.28/30 is directly connected, Serial4/3
C 172.19.101.16/30 is directly connected, Serial4/0
C 172.19.101.20/30 is directly connected, Serial4/1
C 172.19.101.8/30 is directly connected, Serial3/2
C 172.19.101.12/30 is directly connected, Serial3/3
C 172.19.101.0/30 is directly connected, Serial3/0
C 172.19.101.4/30 is directly connected, Serial3/1
C 172.19.101.32/30 is directly connected, Serial5/0
C 172.19.101.36/30 is directly connected, Serial5/1
172.20.0.0/24 is subnetted, 1 subnets
S 172.20.2.0 [1/0] via 10.0.20.2
172.31.0.0/24 is subnetted, 1 subnets

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