ͥåȥڥꥹ - SE̼η -

ͥåȥڥꥹȤλкȤǤͥåȥڥꥹȻι
̡ʤΥġ⡢μʤɤξǺܤޤкߥʡԤäƤޤ ͥåȥڥꥹ
кʤ麸κǤܤ֥ͥڡץ꡼ʵɾҡˤǡ
ͥåȥڥꥹȻ˹ʤȡͥåȥ˴ؤμ䵻ѤǤʤɲϤʸϤȤˤĤޤ
ˡλ˹ʤǤȤ뤳ȤǤޤ

ƥꡧ11.롼ƥ > 11.5 BGP

AS
ASȤϼΧƥȤ̣ΧƥȤȤ褯ʬˤ
ľϡAutonomous=ΡΩפȤ̣
äơASΩͥåȥʥƥˤȹͤФ
ǤϡΧƥΤȤ򡢡ñΥ롼ƥ󥰥ݥꥷˤäƴͥåȥH18NW 23ˡפȽҤ٤Ƥ롣
ä˽ǤϤ뤬AS=ISPȻפäƤ

ASֹ
IANAInternet Assigned Numbers AuthorityʡˤơܤǤJPNICƤ롣
IANAζ̳ϡ1998ǯΩ줿ŪȿǤICANN(Internet Corporation for Assigned Names and Numbers)ԤäƤ롣
ASֹ16ӥåȤǹƤꡢ165535ͤȤ롣
Τʤǡ6451265535ϥץ饤١ASȸƤФ졢ץ饤١IP
ɥ쥹Ʊͤ˴Ȥͳ˳Ƥ뤳ȤǤ롣

IGPInterior Gateway Protocol)
ΧƥѤʤȤ¿ˡ
㡧RIPOSPF

EGPExterior Gateway Protocol)
Χƥ֤Ѥ롣
㡧BGP

󥿡ͥåȤ٤ƤΥ롼ƥ󥰤줷椹뤳ȤϺ񡣤ǡASȤñ̤ߤASϼʬǴƤפȤȤ餳λȤߤϤޤäδطƱ

θȴ츩Ǹ򴹤ʤ⤢Ϥ
顢̤Ƥ롼ƥ󥰥ץȥ롣
EGPǤ롣ȤСBGPǤСξԤξ򴹤ASֹΤߡ

ľΩ

BGPħ򤷤ޤ礦
Χƥ֤Ѥ롼ƥ
IGPEGPǤҤ٤ޤAS֤Υ롼ƥ󥰤ʤΤȿξƤ롣
ȿξȤϡIPɥ쥹ȥ֥ͥåȥޥ
ǡASֹǥ롼ƥ󥰤롣
ǤϡIPͥåȥΥ롼ƥ󥰥ץȥΰĤǤBGP-4ȤơּΧƥ֤³˻Ѥ졢ϩѲȤκʬ롣H18NW 23ˡפȽҤ٤Ƥ롣
BGP-44Version4̣Ƥ롣
AS֤̿򰷤BGPǤϿι⤵Ƥ롣

Ǥ͡
θ̾Ųƻϩ1ܤ̤ˤʤΤȡޤ®ƻϩ̤ˤʤΤϰ̣礤㤤ޤ顣
顢RIPȤϰ㤤BGPǤϷϩ򴹤ˡUDPǤϤʤTCPȤäƤޤͤޤǤˡBGPTCP179֥ݡȡRIPUDP520֤ȤäƷϩθ򴹤ԤOSPFIPľưΤǡTCPUDPȤǰϤʤTCPUDPΰ㤤TCPUDPΥڡdzǧ

ʲʹߤϥƥкƧ߹ǤΤǡͥ٥ȹͤƤ

BGP(Border gateway protocol)ľϡȥǤΥץȥȤ̣ĤޤꡢASζˤơ¾ASȥ롼ƥ󥰾򴹤ץȥ롣
BGPԡBGPꤵƤ롼ƱASˤBGPư롼OSPFʤɤIGPư롼ߤ뤳ȤŪǤ롣
IBGPInternal BGP)ASBGPĤޤƱASֹǤBGP
EBGP(External BGP)AS֤BGP㤨аۤʤץХ֤ǤBGP
ʤIBGPEBGPʬɬפΤ
AS֤̤ISPƱΤȻפФΤǡԤ̤ˤʤ롣ȤȤơХХ顣ХХ̿Ǥ褦꤬ɬסASǤƱԤĤݥꥷ߷פǤΤǡĹʤɤι٤꤬ǽ

ʤ­ΤʤƤ
AS_PATH°ˤĤơ
롼ȾϡASͳ뤴ȤˡͳASֹղäƤޤˤꡢʣηϩ󤬤Ȥˡɤ餬ûȽǤΰĤˤʤޤ
ޤʬΤȤ˥롼ƥ󥰾󤬵äƤƤ⡢롼פȯǤޤ
롼Ⱦ
1)AS1롼ƥ󥰾ȯ
[1.1.1.0/16][ASֹ 1]
2)AS2ͳž
[1.1.1.0/16][ASֹ 1] [ASֹ 2]
3)AS3ͳž
[1.1.1.0/16][ASֹ 1] [ASֹ 2] [ASֹ 3]

롼Ⱦ˼ʬASֹ椬С롼פǤ뤳Ȥ狼롣
Τ褦˥ѥ°ѤϩΤȤѥ٥Ȥ


ݥ󥵡ɥ

ΥڡΥȥåץ