說明hc路由聚合

1、Copyright 2012 Huawei Technologies Co., Ltd. All rights reserved. BGP路由聚合Copyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Page1前 言BGP作為一個(gè)跨域路由協(xié)議，在很多情況下都需要對(duì)明細(xì)路由進(jìn)行聚合，并通告到其它遠(yuǎn)端的AS，而我們將會(huì)在本課程中討論BGP聚合后的路徑屬性變化情況以及聚合后所引起的問題。Copyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Pag

2、e2培訓(xùn)目標(biāo)學(xué)完本課程后，您應(yīng)該能：知道BGP路由聚合的方法了解AS_PATH屬性的變化知道BGP路由聚合配置知道BGP路由聚合策略Copyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Page3目 錄 什么是路由聚合 AS_SET改變路由聚合屬性Copyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Page4目 錄 什么是路由聚合什么是路由聚合 AS_SET改變路由聚合屬性改變路由聚合屬性Copyright 2012 Huawei Tec

3、hnologies Co., Ltd. All rights reserved. Page5路由聚合概述BGP協(xié)議可以使用命令，將具體路由聚合成一條聚合路由。192.168.1.16/28192.168.1.32/28192.168.1.48/28192.168.1.0/26路由表192.168.1.16/28192.168.1.32/28192.168.1.48/28路由表192.168.1.0/26Copyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Page6路由聚合原則十進(jìn)制十進(jìn)制二進(jìn)制二進(jìn)制192.168.

4、1.1611000000.10101000.00000001.00010000192.168.1.3211000000.10101000.00000001.00100000192.168.1.4811000000.10101000.00000001.0011000026 位位6 位位聚合后的路由：192.168.1.0/26Copyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Page7BGP路由聚合種類自動(dòng)聚合自動(dòng)聚合對(duì)BGP引入的IGP子網(wǎng)路由進(jìn)行自然掩碼聚合。配置自動(dòng)聚合后，生成聚合后的自然網(wǎng)段路由，而原引入的

5、子網(wǎng)路由被抑制，不會(huì)被優(yōu)選和發(fā)布給BGP鄰居。AS-100AS-101192.168.1.1/32192.168.1.2/32192.168.1.3/32RTARTBRTAbgp 100RTA-bgpimport-route directRTA-bgppeer 10.1.1.2 as-num 101RTA-bgpsummary automaticRTBdisplay bgp routing-table Status codes: * - valid, - best, d - damped, h - history, i - internal, s - suppressed, S - Stale

6、 Origin : i - IGP, e - EGP, ? - incomplete Network NextHop Path/Ogn * 10.0.0.0 10.1.1.1 100? * 192.168.1.0 10.1.1.1 100?10.1.1.110.1.1.2Copyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Page8BGP路由聚合種類手動(dòng)聚合手動(dòng)聚合對(duì)BGP本地路由進(jìn)行聚合。通常情況下，手動(dòng)聚合的優(yōu)先級(jí)高于自動(dòng)聚合的優(yōu)先級(jí)192.168.1.1/32192.168.1.2/32192.168.1.3

7、/32RTARTBAS-100AS-101RTAbgp 100RTA-bgpnetwork 192.168.1.1 255.255.255.255RTA-bgpnetwork 192.168.1.1 255.255.255.255RTA-bgpnetwork 192.168.1.1 255.255.255.255RTA-bgppeer 10.1.1.2 as-num 101RTA-bgpaggregate 192.168.1.0 24 detail-suppressed10.1.1.110.1.1.2RTBdisplay bgp routing-table Status codes: * -

8、valid, - best, d - damped, h - history, i - internal, s - suppressed, S - Stale Origin : i - IGP, e - EGP, ? - incomplete Network NextHop Path/Ogn * 192.168.1.0 10.1.1.1 100iCopyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Page9BGP路由聚合需要考慮的問題BGP路由聚合需要考慮的問題明細(xì)路由的發(fā)布BGP路由屬性的繼承AS-PathOri

9、ginCommunity Copyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Page10目 錄 什么是路由聚合 AS_SET改變路由聚合屬性Copyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Page11不帶AS_SET的路由聚合AS-100AS-400AS-300AS-200RTDRTCRTARTB160.20.0.0/16160.10.0.0/16aggregate 160.0.0.0 255.0.0.0 detail-suppr

10、essedCopyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Page12AS-100AS-400AS-300AS-200RTDRTCRTARTB160.20.0.0/16160.10.0.0/16不帶AS_SET的路由聚合RTC display bgp routing-tableStatus codes: * - valid, - best, d - damped, h - history, i - internal, s - suppressed, S - Stale Origin : i - IGP, e -

11、 EGP, ? - incomplete Network NextHop Path/Ogn * 160.0.0.0/8 127.0.0.1 i s 160.10.0.0 10.2.2.2 200 i s 160.20.0.0 11.1.1.2 100 i10.2.2.211.1.1.2Copyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Page13不帶AS_SET的路由聚合AS-400AS-300RTCRTD聚合路由 160.0.0.0/8 被認(rèn)為是始發(fā)于 AS-300，并且丟失了所有具體路由 160.10.0.0

12、/16 和 160.20.0.0/16 的AS-PATH信息。RTD display bgp routing-tableStatus codes: * - valid, - best, d - damped, h - history, i - internal, s - suppressed, S - Stale Origin : i - IGP, e - EGP, ? - incomplete Network NextHop Path/Ogn * 160.0.0.0/84.4.4.1 300 i4.4.4.14.4.4.2Copyright 2012 Huawei Technologies

13、Co., Ltd. All rights reserved. Page14帶AS_SET的路由聚合AS-100AS-400AS-300AS-200RTDRTCRTARTB160.20.0.0/16160.10.0.0/16aggregate 160.0.0.0 255.0.0.0 detail-suppressed as-setCopyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Page15帶AS_SET的路由聚合AS-100AS-400AS-300AS-200RTDRTCRTARTB160.20.0.0/1616

14、0.10.0.0/16RTC display bgp routing-tableStatus codes: * - valid, - best, d - damped, h - history, i - internal, s - suppressed, S - Stale Origin : i - IGP, e - EGP, ? - incomplete Network NextHop Path/Ogn * 160.0.0.0/8 127.0.0.1 200 100 i s 160.10.0.0 10.2.2.2 200 i s 160.20.0.0 11.1.1.2 100 i10.2.2

15、.211.1.1.2Copyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Page16帶AS_SET的路由聚合RTD display bgp routing-tableStatus codes: * - valid, - best, d - damped, h - history, i - internal, s - suppressed, S - Stale Origin : i - IGP, e - EGP, ? - incomplete Network NextHop Path/Ogn * 160.0.0.0/

16、84.4.4.1300 200 100 iAS-400AS-300RTCRTDAS_SET信息在避免路由環(huán)路時(shí)很重要，因?yàn)樗涗浟吮痪酆下酚伤?jīng)過的AS。Copyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Page17帶AS_SET的路由聚合AS-100AS-400AS-300AS-200RTDRTCRTARTB160.20.0.0/16160.10.0.0/16RTD display bgp routing-table Network NextHop Path/Ogn * 160.0.0.0/84.4.4.1 3

17、00 200 iXCopyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Page18目 錄 什么是路由聚合 AS_SET改變路由聚合屬性Copyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Page19聚合路由的問題聚合路由不繼承原有BGP路由屬性可以通過命令修改聚合路由屬性：aggregate ip-address mask as-set | attribute-policy route-policy-name1 | detail-sup

18、pressed | origin-policy route-policy-name2 | suppress-policy route-policy-name3 Copyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Page20Attribute-PolicyAS-100AS-400AS-300AS-200RTDRTCRTARTB160.20.0.0/16160.10.0.0/16Aggregate 160.0.0.0 255.0.0.0 detail-suppressed attribute-policy att1#route-policy att1 permit node 10 apply origin incompleteCopyright 2012 Huawei Technologies Co., Ltd. All rights reserved. Page21Attribute-PolicyAS-100AS-400AS-300