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BGP????

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Title: BGP Author: Last modified by: Created Date: 10/16/2003 1:26:13 AM Document presentation format: – PowerPoint PPT presentation

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Title: BGP????

1
BGP????
???????? 2007?1?
2
????
??? BGP??????? ??? BGP????
3
BGP ????

BGP???????,???AS????????
??????????????
?????????
???Metric????
????????????
?????????
??CIDR(???????)
????????????

4
BGP ???????

????TCP,???179
???????
?????keepalive????TCP????
???????????

5
????( Autonomous System )

???????(AS)?
??????????????
???????????--IGP
??????????? EGP

6
BGP????
7
BGP????-IBGP?EBGP
AS100
AS300
AS200
8
BGP??????

?????,BGP Speaker??????????
BGP Speaker???????????????
BGP Speaker?EBGP??????????BGP?????(??EBGP?IBGP)
?????,BGP Speaker??????BGP?????????

9
BGP??????
AS200
RTB
AS100
S011.1.1.2/16
S011.1.1.1/16
RTD
S011.4.1.2/24
L11.1.1.1/8
RTA
E011.2.1.1/16
S011.4.1.1/24
E011.2.1.2/16
L211.4.2.1/24
L210.1.1.1/8
RTC
10
BGP??????

BGP Speaker ?IBGP????????????IBGP???

?IBGP?????????????,BGP?????????? ??,AS???????????
????
11
BGP??????

BGP Speaker ?IBGP????????????EBGP?????IGP?BGP?????
???

12
IBGP???
X 12
X 12
Rtr-A
Rtr-B
IBGP
R-12
AS 12
X 12
AS 14
AS 42
EBGP
R-14
Rtr-D
Rtr-C

??IBGP???????????
??IBGP???????????

13
??BGP????????????
AS200
18.0.0.1/8
OSPF
RTB
OSPF????18.0.0.1/8 ?IGP(OSPF)????? ???????RTB? BGP
????
14
??BGP????????????
AS200
18.0.0.1/8
OSPF
RTB
OSPF????18.0.0.1/8 ?IGP(OSPF)????? ???????RTB? BGP
????
15
??BGP???????????
AS200
18.0.0.1/8
RTB
????????18.0.0.1/8 ????????????? RTB?BGP????
16
BGP????

BGP???????
Open
KeepAlive
Update
Notification

17
BGP???

BGP?????????,???????????,??????BGP???

Marker(16 byte)
Length(2 byte)
Type(1 byte)
18
Open??

Open????????????????

19
KeepAlive??

KeepAlive????????

Marker(16 byte)
Length(2 byte)
Type(1 byte)
20
Update??

Update??????????????

21
Notification??

Notification??????????????

???? 1 2 3 4 5 6
???? ???? OPEN??? UPDATE??? ?????? ???? ??
22
BGP??????
23
BGP????????

??TCP??BGP???,??open??
?????,???????????????,??UPDATE??????????
??????????KEEPALIVE?????BGP??????
???BGP?????????,???NOTIFICATION????BGP??

24
????
??? BGP??????? ??? BGP????
25
BGP?????

????????
???????
??????
????
?????16???

26
??BGP????

1?Origin
2?AS-Path
3?Next hop
4?MED
5?Local-Preference
6?Atomic-Aggregate
7?Aggregator
8?Community

9?Originator-ID 10?Cluster-List 11?Destination
Pref (MCI) 12?Advertiser (Baynet) 13?Rcid-Path
(Baynet) 14?MP_Reach_NLRI 15?MP_Unreach_NLRI 16?Ex
tended_Communities
27
?? (Origin) ??

???,????????????Origin??
??????????????BGP?????,?origin???IGP
?????EGP???,?origin???EGP
?????,Origin???? Incomplete

28
AS??(AS-Path)??
D(18.0.0.0/8)
AS300
AS200
RTA
AS400
30.0.0.1
D,dl 400 300 200
30.0.0.2
RTB
AS100
AS500
D,d2 500 200
D,d1 400 300 200 gtD,d2 500 200
29
???
?
RTA
Network10.0.0.0/8 AS-Path387 213
RTC
RTB
AS 213 10.0.0.0/8
Network10.0.0.0/8 AS-Path213
RTA???????????
30
????AS-Path
????
2 Mbps
AS 462
Network10.0.0.0/8 AS-Path462 123
2 Mbps
RTA
RTB
64 kbps
AS 123 10.0.0.0/8
????
AS 387
?????AS-number ??? AS-path??
31
???(Next Hop)??
RTA ?????10.0.0.2??18.0.0
.0/8 ?????10.0.0.3??20.0.0.0/8 ?????21.0.0.1??19.0
.0.0/8
RTC ?????10.0.0.1??19.0
.0.0/8 ?????10.0.0.3??20.0.0.0/8
AS200
RTC
EBGP
RTA
18.0.0.0/8
10.0.0.1
AS100
21.0.0.2
10.0.0.2
IBGP
IBGP
20.0.0.0/8
21.0.0.1
10.0.0.3
RTD
19.0.0.0/8
RTB
RTB ?????10.0.0.2??18.0.0.
0/8 ?????10.0.0.3??20.0.0.0/8
32
???????(Local-preference)
33
MED(Multi-Exit-DISC)??
34
BGP????