BGP学习阶段1
BGP学习过程-1
一、R1与R2分属于AS1、AS2。
r1#show run
Building configuration...
Current configuration : 1252 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname r1
!
!
ip subnet-zero
ip cef
!
!
no ip domain-lookup
!
call rsvp-sync
!
!
interface Loopback0
ip address 1.1.1.1 255.255.255.0
!
interface FastEthernet0/0
no ip address
shutdown
duplex half
!
interface Serial1/0
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/1
ip address 192.168.12.1 255.255.255.0
serial restart-delay 0
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/0
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/1
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/3
no ip address
shutdown
serial restart-delay 0
!
router bgp 1
bgp log-neighbor-changes
network 1.1.1.0 mask 255.255.255.0
network 192.168.12.0
neighbor 192.168.12.2 remote-as 2
!
ip classless
no ip http server
!
!
dial-peer cor custom
!
!
gatekeeper
shutdown
!
!
line con 0
exec-timeout 0 0
password cisco
logging synchronous
line aux 0
line vty 0 4
password cisco
login
!
end
------------------------
r2#show run
00:10:43: %SYS-5-CONFIG_I: Configured from console by console
r2#show run
Building configuration...
Current configuration : 1252 bytes
!
version 12.2
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname r2
!
!
ip subnet-zero
ip cef
!
!
no ip domain-lookup
!
call rsvp-sync
!
!
interface Loopback0
ip address 2.2.2.2 255.255.255.0
!
interface FastEthernet0/0
no ip address
shutdown
duplex half
!
interface Serial1/0
ip address 192.168.12.2 255.255.255.0
serial restart-delay 0
!
interface Serial1/1
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial1/3
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/0
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/1
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/2
no ip address
shutdown
serial restart-delay 0
!
interface Serial2/3
no ip address
shutdown
serial restart-delay 0
!
router bgp 2
bgp log-neighbor-changes
network 2.2.2.0 mask 255.255.255.0
network 192.168.12.0
neighbor 192.168.12.1 remote-as 1
!
ip classless
no ip http server
!
!
dial-peer cor custom
!
!
gatekeeper
shutdown
!
!
line con 0
exec-timeout 0 0
password cisco
logging synchronous
line aux 0
line vty 0 4
password cisco
login
!
end
有关状态详解：
r1#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, su - IS-IS summary, 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
C 192.168.12.0/24 is directly connected, Serial1/1
1.0.0.0/24 is subnetted, 1 subnets
C 1.1.1.0 is directly connected, Loopback0
2.0.0.0/24 is subnetted, 1 subnets
B 2.2.2.0 [20/0] via 192.168.12.2, 00:10:16
r1#ping 2.2.2.2 source 1.1.1.1
Type escape sequence to abort.
Sending 5, 100-byte ICMP Echos to 2.2.2.2, timeout is 2 seconds:
Packet sent with a source address of 1.1.1.1
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 4/27/56 ms
r1#show ip bgp
BGP table version is 4, 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
*> 1.1.1.0/24 0.0.0.0 0 32768 i
*> 2.2.2.0/24 192.168.12.2 0 0 2 i
* 192.168.12.0 192.168.12.2 0 0 2 i
*> 0.0.0.0 0 32768 i
r1#show ip bgp neighbors
BGP neighbor is 192.168.12.2, remote AS 2, external link
BGP version 4, remote router ID 2.2.2.2
BGP state = Established, up for 00:13:34
Last read 00:00:34, hold time is 180, keepalive interval is 60 seconds
Neighbor capabilities:
Route refresh: advertised and received(old & new)
Address family IPv4 Unicast: advertised and received
Message statistics:
InQ depth is 0
OutQ depth is 0
Sent Rcvd
Opens: 1 1
Notifications: 0 0
Updates: 1 1
Keepalives: 16 16
Route Refresh: 0 0
Total: 18 18
Default minimum time between advertisement runs is 30 seconds
For address family: IPv4 Unicast
BGP table version 4, neighbor version 4
Index 1, Offset 0, Mask 0x2
Sent Rcvd
Prefix activity: ---- ----
Prefixes Current: 2 2 (Consumes 72 bytes)
Prefixes Total: 2 2
Implicit Withdraw: 0 0
Explicit Withdraw: 0 0
Used as bestpath: n/a 1
Used as multipath: n/a 0
Outbound Inbound
Local Policy Denied Prefixes: -------- -------
Bestpath from this peer: 1 n/a
Total: 1 0
Number of NLRIs in the update sent: max 2, min 0
Connections established 1; dropped 0
Last reset never
Connection state is ESTAB, I/O status: 1, unread input bytes: 0
Local host: 192.168.12.1, Local port: 11000
Foreign host: 192.168.12.2, Foreign port: 179--------BGP使用的是TCP的179端口
Enqueued packets for retransmit: 0, input: 0 mis-ordered: 0 (0 bytes)
Event Timers (current time is 0xF670C):
Timer Starts Wakeups Next
Retrans 19 0 0x0
TimeWait 0 0 0x0
AckHold 18 14 0x0
SendWnd 0 0 0x0
KeepAlive 0 0 0x0
GiveUp 0 0 0x0
PmtuAger 0 0 0x0
DeadWait 0 0 0x0
iss: 2892687547 snduna: 2892687953 sndnxt: 2892687953 sndwnd: 15979
irs: 2895553805 rcvnxt: 2895554211 rcvwnd: 15979 delrcvwnd: 405
SRTT: 276 ms, RTTO: 466 ms, RTV: 190 ms, KRTT: 0 ms
minRTT: 4 ms, maxRTT: 300 ms, ACK hold: 200 ms
Flags: higher precedence, nagle
Datagrams (max data segment is 1460 bytes):
Rcvd: 20 (out of order: 0), with data: 18, total data bytes: 405
Sent: 34 (retransmit: 0, fastretransmit: 0), with data: 18, total data bytes: 405
r1#show ip bgp summary
BGP router identifier 1.1.1.1, local AS number 1
BGP table version is 4, main routing table version 4
3 network entries using 291 bytes of memory
4 path entries using 144 bytes of memory
2 BGP path attribute entries using 120 bytes of memory
1 BGP AS-PATH entries using 24 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 using 579 total bytes of memory
BGP activity 3/0 prefixes, 4/0 paths, scan interval 60 secs
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
192.168.12.2 4 2 20 20 4 0 0 00:15:53 2
r1#debug ip bgp
BGP debugging is on
r1#clear ip bgp *
r1#
00:20:16: BGP: 192.168.12.2 went from Established to Idle
00:20:16: %BGP-5-ADJCHANGE: neighbor 192.168.12.2 Down User reset
r1#
00:20:16: BGP: 192.168.12.2 closing
r1#
00:20:36: BGP: 192.168.12.2 went from Idle to Active
00:20:36: BGP: 192.168.12.2 open active, delay 26680ms
r1#
00:20:53: BGP: Applying map to find origin for 1.1.1.0/24
00:20:53: BGP: Applying map to find origin for 192.168.12.0/24
r1#
00:20:55: BGP: 192.168.12.2 passive open
00:20:55: BGP: 192.168.12.2 went from Active to Idle
00:20:55: BGP: 192.168.12.2 went from Idle to Connect
00:20:55: BGP: 192.168.12.2 rcv message type 1, length (excl. header) 26
00:20:55: BGP: 192.168.12.2 rcv OPEN, version 4
00:20:55: BGP: 192.168.12.2 went from Connect to OpenSent
00:20:55: BGP: 192.168.12.2 sending OPEN, version 4, my as: 1
00:20:55: BGP: 192.168.12.2 rcv OPEN w/ OPTION parameter len: 16
00:20:55: BGP: 192.168.12.2 rcvd OPEN w/ optional parameter type 2 (Capability) len 6
00:20:55: BGP: 192.168.12.2 OPEN has CAPABILITY code: 1, length 4
00:20:55: BGP: 192.168.12.2 OPEN has MP_EXT CAP for afi/safi: 1/1
00:20:55: BGP: 192.168.12.2 rcvd OPEN w/ optional parameter type 2 (Capability) len 2
00:20:55: BGP: 192.168.12.2 OPEN has CAPABILITY code: 128, length 0
00:20:55: BGP: 192.168.12.2 OPEN has ROUTE-REFRESH capability(old) for all address-families
00:20:55: BGP: 192.168.12.2 rcvd OPEN w/ optional parameter type
r1#2 (Capability) len 2
00:20:55: BGP: 192.168.12.2 OPEN has CAPABILITY code: 2, length 0
00:20:55: BGP: 192.168.12.2 OPEN has ROUTE-REFRESH capability(new) for all address-families
00:20:55: BGP: 192.168.12.2 went from OpenSent to OpenConfirm
00:20:55: BGP: 192.168.12.2 send message type 1, length (incl. header) 45
00:20:55: BGP: 192.168.12.2 went from OpenConfirm to Established
00:20:55: %BGP-5-ADJCHANGE: neighbor 192.168.12.2 Up
r1#
00:21:53: BGP: Applying map to find origin for 1.1.1.0/24
00:21:53: BGP: Applying map to find origin for 192.168.12.0/24
r1#
00:22:53: BGP: Applying map to find origin for 1.1.1.0/24
00:22:53: BGP: Applying map to find origin for 192.168.12.0/24
r1#un all
All possible debugging has been turned off
R2状态显示：
r2#
00:20:18: %BGP-5-ADJCHANGE: neighbor 192.168.12.1 Down Peer closed the session
r2#
00:20:54: %BGP-5-ADJCHANGE: neighbor 192.168.12.1 Up