BGP AS 65000 AS 64500 BGP AS 65500 BGP AS 65250
0 7 15 23 31 BGP Message 16byte Marker 2byte Length, 1byte Type. Marker : BGP Message, BGP Peer.Message Type Open Marker 1.. Length : BGP Message, 19byte(16byte + 2byte + 1byte) 4096byte. Type : Message. Open Update Notification Keepalive
0 7 15 23 31
BGP Capability Negotiation : Sniffer can not understatnd
Neighbors AS 65500 B C Neighbors A AS 65000
AS 64500 AS 65000 172.16.0.0 A 172.17.0.0 B 10.1.1.2 10.1.1.1
BGP..
B C A
IBGP Neighbors AS 65500 B C EBGP Neighbors A AS 65500
Physical Logical AS 3 EBGP Directly connected RT4 IBGP RT1 EBGP multihop RT2 RT3 AS1 This router is not able to run bgp AS2
AS 65000 172.20.0.0 172.20.10.1 172.20.10.2 B 10.10.10.1 C 10.10.10.3 A 172.16.0.0 AS 64500 AS 65000 172.20.0.0 172.20.10.1 172.20.10.2 B 10.10.10.1 C 10.10.10.3 A 172.16.0.0 AS 64500
128.213.1.0 /24 3.3.3.3 1.1.1.1 LA AS 1 SJ IBGP 2.2.2.2 SF DMZ I can reach 128.213.1.0 /24 via next hop 2.2.2.2 next-hop-self 172.20.0.0 172.30.0.0 AS 65000 B 10.10.10.1 EBGP 10.10.10.3 10.10.10.2 C 172.16.0.0 A AS 64500
172.20.0.0 172.30.0.0 AS 65000 B 10.10.10.1 EBGP 10.10.10.3 10.10.10.2 FR C 172.16.0.0 A AS 64500
AS 65500 172.20.0.0 B MED = 150 C MED = 200 A 172.16.0.0 AS 65000 ISP AS 300 IBGP EBGP EBGP AS 525 206.25.160.0/19
AS 65000 AS 65250 172.20.0.0 AS 65500 B D C Weight = 200 Weight = 150 A AS 64500
AS 100 AS 200 172.16.0.0 /24 172.16.1.0 /24 172.16.2.0 /24... 172.16.15.0 /24 172.16.0.0 /20 172.16.0.0 /20 Aggregation route Update Route Update. Route Update.
AS 100 SF SF AS 200 172.16.0.0 /24 172.16.1.0 /24 172.16.2.0 /24... 172.16.15.0 /24 172.16.0.0 /20 172.16.0.0 /24 172.16.1.0 /24 172.16.2.0 /24... 172.16.15.0 /24 172.16.0.0 /20 NAP 172.16.0.0 /20 Aggregation Route Route Update. ISP Route Update Route Best Path. ISP Aggregation Route NAP Update. Route NO_EXPORT Community Attribute ISP NAP Update. 172.16.10.0 B 10.1.1.1 AS 65000 172.16.20.0 192.168.1.49 192.168.1.50 C 172.16.0.0/16 Note: There is no IGP running in this example 10.1.1.2 A 192.168.2.0 AS 64500
RtrA#show ip bgp BGP table version is 7, local router ID is 172.16.10.1 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 *> 10.10.10.0/24 0.0.0.0 0 32768 i *> 10.10.20.0/24 0.0.0.0 0 32768 i * 172.20.0.0 10.10.20.1 0 65250 65000 i *> 10.10.10.2 0 0 65000 i *> 172.25.0.0 10.10.10.2 0 65000 65500 i * 10.10.20.1 0 65250 65500 i * 172.30.0.0 10.10.10.2 0 65000 65250 i *> 10.10.20.1 0 0 65250 i RtrA#sh ip bgp BGP table version is 9, local router ID is 172.16.10.1 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 *> 10.10.10.0/24 0.0.0.0 0 32768 i *> 10.10.20.0/24 0.0.0.0 0 32768 i *> 172.20.0.0 10.10.20.1 150 65250 65000 i * 10.10.10.2 0 100 65000 i *> 172.25.0.0 10.10.20.1 150 65250 65500 i * 10.10.10.2 100 65000 65500 i *> 172.30.0.0 10.10.20.1 0 150 65250 i * 10.10.10.2 100 65000 65250 i