《山東電信公司德州城域網(wǎng)網(wǎng)絡(luò)基礎(chǔ)知識(shí)培訓(xùn)-bgp路由協(xié)議》-全文預(yù)覽
【正文】 0 AS 65500 擁有最小 MED (也稱為 metric)值的 Paths 優(yōu)先考慮 在路由器上配置 MED值 MED 僅發(fā)送給外部的 BGP neighbors MED = 150 MED = 200 B A C 26 Origin Attribute IGP (i) work mand EGP (e) Redistributed from EGP Inplete (?) Redistributed from IGP or static 27 Community Attribute ?Communities are a means of tagging routes to ensure consistent filtering or routeselection policy ?Any BGP router can tag routes in ining and outgoing routing updates, or when doing redistribution ?Any BGP router can filter routes in ining or outgoing updates, or select preferred routes based on munities (the tag) ?By default, munities are stripped in outgoing BGP updates 28 Weight Attribute (Cisco的專有屬性 ) AS 64500 AS 65000 Weight = 200 Weight = 150 AS 65500 AS 65250 擁有最高 weight 值的 Paths優(yōu)先考慮 在路由器上配置 Weight值 , 以每個(gè) neighbor為基礎(chǔ) Weight值不會(huì)通告給任何 BGP neighbors D B A C 29 BGP 信息同步 保證整個(gè) AS的路由信息一致性 避免在 AS內(nèi)部出現(xiàn)路由黑洞 當(dāng)在 AS內(nèi)部的所有路由器都運(yùn)行 BGP時(shí)最好關(guān)閉這一功能 同步規(guī)則 : 除非相應(yīng)的路由信息是通過 IGP學(xué)過來的，否則就不要把從 IBGP學(xué)過來的路由通告給外部 neighbor 30 BGP 同步舉例： AS 65500 AS 65000 AS 64500 IBGP EBGP EBGP ? 如果打開 BGP同步 (默認(rèn) ): 路由器 A, C, 以及 D將不理（也不通告）到 ，除非通過I
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