R1
interface Loopback0
ip address 1.1.1.1 255.255.255.255
interface Serial2/1
ip address 12.0.0.1 255.255.255.0
serial restart-delay 0
router ospf 1
log-adjacency-changes
network 0.0.0.0 255.255.255.255 area 0
router bgp 100
bgp log-neighbor-changes
network 1.1.1.1 mask 255.255.255.255
neighbor 3.3.3.3 remote-as 100
neighbor 3.3.3.3 update-source Loopback0
line con 0
exec-timeout 0 0
logging synchronous
stopbits 1
line aux 0
stopbits 1
line vty 5 15
R1#show ip bgp summary
BGP router identifier 1.1.1.1, local AS number 100
BGP table version is 3, main routing table version 3
2 network entries and 2 paths using 266 bytes of memory
2 BGP path attribute entries using 120 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP activity 2/8 prefixes, 2/0 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
3.3.3.3 4 100 83 83 3 0 0 01:18:59 1
R1#show ip bgp neighbors
BGP neighbor is 3.3.3.3, remote AS 100, internal link
BGP version 4, remote router ID 3.3.3.3
BGP state = Established, up for 01:19:33
Last read 00:00:33, 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 84 messages, 0 notifications, 0 in queue
Sent 84 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 3, neighbor version 3
Index 1, Offset 0, Mask 0x2
1 accepted prefixes consume 36 bytes
Prefix advertised 1, suppressed 0, withdrawn 0
Number of NLRIs in the update sent: max 1, min 0
Connections established 1; dropped 0
Last reset never
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Local host: 1.1.1.1, Local port: 179
Foreign host: 3.3.3.3, Foreign port: 11000
Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)
Event Timers (current time is 0x90EFAC):
Timer Starts Wakeups Next
Retrans 89 4 0x0
TimeWait 0 0 0x0
AckHold 84 30 0x0
SendWnd 0 0 0x0
KeepAlive 0 0 0x0
GiveUp 0 0 0x0
PmtuAger 0 0 0x0
DeadWait 0 0 0x0
iss: 1796109428 snduna: 1796111088 sndnxt: 1796111088 sndwnd: 16365
irs: 4266653661 rcvnxt: 4266655321 rcvwnd: 16365 delrcvwnd: 19
SRTT: 337 ms, RTTO: 538 ms, RTV: 201 ms, KRTT: 0 ms
minRTT: 12 ms, maxRTT: 604 ms, ACK hold: 200 ms
Flags: passive open, nagle, gen tcbs
Datagrams (max data segment is 536 bytes):
Rcvd: 164 (out of order: 0), with data: 84, total data bytes: 1659
Sent: 127 (retransmit: 4), with data: 84, total data bytes: 1659
R1#show ip bgp
BGP table version is 3, local router ID is 1.1.1.1
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*> 1.1.1.1/32 0.0.0.0 0 32768 i
*>i3.3.3.3/32 3.3.3.3 0 100 0 i
R1#show ip rou
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 not set
1.0.0.0/32 is subnetted, 1 subnets
C 1.1.1.1 is directly connected, Loopback0
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/65] via 12.0.0.2, 00:45:27, Serial2/1
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/129] via 12.0.0.2, 00:45:27, Serial2/1
23.0.0.0/24 is subnetted, 1 subnets
O 23.0.0.0 [110/128] via 12.0.0.2, 00:45:27, Serial2/1
12.0.0.0/24 is subnetted, 1 subnets
C 12.0.0.0 is directly connected, Serial2/1
R2
interface Loopback0
ip address 2.2.2.2 255.255.255.0
interface Serial2/1
ip address 12.0.0.2 255.255.255.0
serial restart-delay 0
interface Serial2/2
ip address 23.0.0.1 255.255.255.0
serial restart-delay 0
router ospf 1
log-adjacency-changes
network 0.0.0.0 255.255.255.255 area 0
line con 0
exec-timeout 0 0
logging synchronous
stopbits 1
line aux 0
stopbits 1
line vty 5 15
R2#show 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 not set
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/65] via 12.0.0.1, 00:50:15, Serial2/1
2.0.0.0/24 is subnetted, 1 subnets
C 2.2.2.0 is directly connected, Loopback0
3.0.0.0/32 is subnetted, 1 subnets
O 3.3.3.3 [110/65] via 23.0.0.2, 00:50:15, Serial2/2
23.0.0.0/24 is subnetted, 1 subnets
C 23.0.0.0 is directly connected, Serial2/2
12.0.0.0/24 is subnetted, 1 subnets
C 12.0.0.0 is directly connected, Serial2/1
R3
interface Loopback0
ip address 3.3.3.3 255.255.255.255
interface Serial2/1
ip address 23.0.0.2 255.255.255.0
serial restart-delay 0
router ospf 1
log-adjacency-changes
network 0.0.0.0 255.255.255.255 area 0
router bgp 100
bgp log-neighbor-changes
network 3.3.3.3 mask 255.255.255.255
neighbor 1.1.1.1 remote-as 100
neighbor 1.1.1.1 update-source Loopback0
line con 0
exec-timeout 0 0
logging synchronous
stopbits 1
line aux 0
stopbits 1
line vty 5 15
R3# show 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 not set
1.0.0.0/32 is subnetted, 1 subnets
O 1.1.1.1 [110/129] via 23.0.0.1, 00:46:28, Serial2/1
2.0.0.0/32 is subnetted, 1 subnets
O 2.2.2.2 [110/65] via 23.0.0.1, 00:46:28, Serial2/1
3.0.0.0/32 is subnetted, 1 subnets
C 3.3.3.3 is directly connected, Loopback0
23.0.0.0/24 is subnetted, 1 subnets
C 23.0.0.0 is directly connected, Serial2/1
12.0.0.0/24 is subnetted, 1 subnets
O 12.0.0.0 [110/128] via 23.0.0.1, 00:46:28, Serial2/1
R3#show ip bgp summary
BGP router identifier 3.3.3.3, local AS number 100
BGP table version is 3, main routing table version 3
2 network entries and 2 paths using 266 bytes of memory
2 BGP path attribute entries using 120 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
BGP activity 2/4 prefixes, 2/0 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
1.1.1.1 4 100 87 87 3 0 0 01:22:49 1
R3#show ip bgp neighbors
BGP neighbor is 1.1.1.1, remote AS 100, internal link
BGP version 4, remote router ID 1.1.1.1
BGP state = Established, up for 01:23:17
Last read 00:00:16, 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 88 messages, 0 notifications, 0 in queue
Sent 88 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 3, neighbor version 3
Index 1, Offset 0, Mask 0x2
1 accepted prefixes consume 36 bytes
Prefix advertised 1, suppressed 0, withdrawn 0
Number of NLRIs in the update sent: max 1, min 0
Connections established 1; dropped 0
Last reset never
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Local host: 3.3.3.3, Local port: 11000
Foreign host: 1.1.1.1, Foreign port: 179
Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)
Event Timers (current time is 0x94408C):
Timer Starts Wakeups Next
Retrans 98 9 0x0
TimeWait 0 0 0x0
AckHold 88 66 0x0
SendWnd 0 0 0x0
KeepAlive 0 0 0x0
GiveUp 0 0 0x0
PmtuAger 0 0 0x0
DeadWait 0 0 0x0
iss: 4266653661 snduna: 4266655397 sndnxt: 4266655397 sndwnd: 16289
irs: 1796109428 rcvnxt: 1796111164 rcvwnd: 16289 delrcvwnd: 95
SRTT: 301 ms, RTTO: 311 ms, RTV: 10 ms, KRTT: 0 ms
minRTT: 4 ms, maxRTT: 464 ms, ACK hold: 200 ms
Flags: higher precedence, nagle
Datagrams (max data segment is 536 bytes):
Rcvd: 136 (out of order: 0), with data: 88, total data bytes: 1735
Sent: 164 (retransmit: 9), with data: 88, total data bytes: 1735
R3#show ip bgp
BGP table version is 3, local router ID is 3.3.3.3
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
Network Next Hop Metric LocPrf Weight Path
*>i1.1.1.1/32 1.1.1.1 0 100 0 i
*> 3.3.3.3/32 0.0.0.0 0 32768 i
 beiluo by 2008-7-5 11:54:41
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