[toc] ##BGP反射器 ###实验拓扑
###实验需求 R1为客户机 R2为路由反射器 R3为非客户机 ###实验步骤 1.配置IP地址及环回口地址 2.配置BGP并建立邻居 R1
[Huawei]int g0/0/0 [Huawei-GigabitEthernet0/0/0]ip address 172.18.1.1 24 [Huawei]int l0 [Huawei-LoopBack0]1.1.1.1 32 [Huawei]bgp 100 [Huawei-bgp]peer 172.18.1.2 as-number 100 [Huawei-bgp]network 1.1.1.1 32 //宣告网段R2
[Huawei]int g0/0/0 [Huawei-GigabitEthernet0/0/0]ip address 172.18.1.1 24 [Huawei-GigabitEthernet0/0/0]ip address 172.18.1.2 24 [Huawei-GigabitEthernet0/0/0]int g0/0/1 [Huawei-GigabitEthernet0/0/1]ip address 172.16.1.1 24 [Huawei]bgp 100 [Huawei-bgp]peer 172.18.1.1 as-number 100 [Huawei-bgp]peer 172.16.1.2 as-number 100R3
[Huawei]int g0/0/0 [Huawei-GigabitEthernet0/0/0]ip address 172.16.1.2 24 [Huawei-GigabitEthernet0/0/0]bgp 100 [Huawei-bgp]peer 172.16.1.1 as-number 100####在R2上查看BGP邻居表
Huawei]dis bgp peer BGP local router ID : 172.18.1.2 Local AS number : 100 Total number of peers : 2 Peers in established state : 2 Peer V AS MsgRcvd MsgSent OutQ Up/Down State Pre fRcv 172.16.1.2 4 100 29 32 0 00:26:44 Established 1 172.18.1.1 4 100 31 31 0 00:27:37 Established 2####在R2上做反射器
[Huawei-bgp]peer 172.18.1.1 reflect-client####在R3上查看1.1.1.1 路由表,进行观察
[R3-bgp]dis bgp routing-table BGP Local router ID is 172.16.1.2 Status codes: * - valid, > - best, d - damped, h - history, i - internal, s - suppressed, S - Stale Origin : i - IGP, e - EGP, ? - incomplete Total Number of Routes: 1 Network NextHop MED LocPrf PrefVal Path/Ogn i 1.1.1.1/32 172.18.1.1 0 100 0 i####在R3上查看1.1.1.1 路由详细信息
[R3]dis bgp routing-table 1.1.1.1 32 BGP local router ID : 172.16.1.2 Local AS number : 100 Paths: 1 available, 0 best, 0 select BGP routing table entry information of 1.1.1.1/32: From: 172.16.1.1 (172.18.1.2) Route Duration: 00h04m16s Relay IP Nexthop: 0.0.0.0 Relay IP Out-Interface: Original nexthop: 172.18.1.1 Qos information : 0x0 AS-path Nil, origin igp, MED 0, localpref 100, pref-val 0, internal, pre 255 Originator: 172.18.1.1 Cluster list: 172.18.1.2 Not advertised to any peer yetOriginator：始发者的IP地址 Cluster list : 经过了一个RR
##BGP联盟实验 ###实验拓扑
###实验需求
所有设备运行BGP协议,AS100划分两个子AS ，R5为AS 200R4可以学到R1宣告的路由信息AS 100 利用 OSPF 协议解决内部网络互通R3 和 R5 利用直连接口建立 EBGP 邻居 ###实验步骤 ####配置IP地址及环回口地址 ####运行BGP协议配置如下 AR1 [AR1]BGP 65001 [AR1-bgp]peer 172.18.1.2 as-number 65001 [AR1-bgp]network 1.1.1.1 32 //宣告网段AR2
[AR2]bgp 65001 [AR2-bgp]confederation id 100 [AR2-bgp]confederation peer-as 65002 [AR2-bgp]confederation peer-as 65001 [AR2-bgp]peer 172.18.1.1 as-number 65001 [AR2-bgp]peer 172.16.1.2 as-number 65002AR3
[AR3]bgp 65002 [AR3-bgp]confederation id 100 [AR3-bgp]peer 172.17.1.1 as-number 65002AR4
[AR4]bgp 65002 [AR4-bgp]peer 172.17.1.2 as-number 65002####在AR2上查看BGP邻居表
[AR2]dis bgp peer BGP local router ID : 172.18.1.2 Local AS number : 65001 Total number of peers : 2 Peers in established state : 2 Peer V AS MsgRcvd MsgSent OutQ Up/Down State Pre fRcv 172.16.1.2 4 65002 61 63 0 00:59:32 Established 0 172.18.1.1 4 65001 69 67 0 01:05:20 Established 1####在AR3上查看BGP邻居表
[AR3]dis bgp peer BGP local router ID : 172.16.1.2 Local AS number : 65002 Total number of peers : 2 Peers in established state : 2 Peer V AS MsgRcvd MsgSent OutQ Up/Down State Pre fRcv 172.16.1.1 4 65001 61 60 0 00:58:35 Established 1 172.17.1.1 4 65002 24 26 0 00:22:49 Established 0####在R4上查看路由表 破除了IBGP水平分割
[Huawei]dis bgp routing-table BGP Local router ID is 172.17.1.1 Status codes: * - valid, > - best, d - damped, h - history, i - internal, s - suppressed, S - Stale Origin : i - IGP, e - EGP, ? - incomplete Total Number of Routes: 2 Network NextHop MED LocPrf PrefVal Path/Ogn *>i 1.1.1.1/32 172.18.1.1 0 100 0 (65001)i####在R3和R5上建立EBGP邻居关系
[AR3]bgp 65002 [AR3-bgp]peer 20.20.1.1 as-number 200创建环回口，在R5上把网段宣告进BGP
R5-bgp]int l0 [R5-LoopBack0]ip address 2.2.2.2 32 [R5]bgp 200 [R5-bgp]peer 20.20.1.2 as-number 100 [R5-bgp]network 2.2.2.2 32####在R3上查看邻居
[AR3]dis bgp peer BGP local router ID : 172.16.1.2 Local AS number : 65002 Total number of peers : 3 Peers in established state : 3 Peer V AS MsgRcvd MsgSent OutQ Up/Down State Pre fRcv 20.20.1.1 4 200 43 52 0 00:40:21 Established 1 172.16.1.1 4 65001 43 44 0 00:40:19 Established 1 172.17.1.1 4 65002 39 44 0 00:37:42 Established 0####在R4上查看BGP路由表 发现学习到的R5 2.2.2.2 路由 不是可用最优的，因为下一跳不可达。
[Huawei]dis bg routing-table BGP Local router ID is 172.17.1.1 Status codes: * - valid, > - best, d - damped, h - history, i - internal, s - suppressed, S - Stale Origin : i - IGP, e - EGP, ? - incomplete Total Number of Routes: 2 Network NextHop MED LocPrf PrefVal Path/Ogn *>i 1.1.1.1/32 172.18.1.1 0 100 0 (65001)i i 2.2.2.2/32 20.20.1.1 0 100 0 200i####在R5上查看BGP 路由表
[R5]dis bgp routing-table BGP Local router ID is 20.20.1.1 Status codes: * - valid, > - best, d - damped, h - history, i - internal, s - suppressed, S - Stale Origin : i - IGP, e - EGP, ? - incomplete Total Number of Routes: 2 Network NextHop MED LocPrf PrefVal Path/Ogn *> 1.1.1.1/32 20.20.1.2 0 100i *> 2.2.2.2/32 0.0.0.0 0 0 i联盟将一个AS划分为若干个子AS。每个子AS内部建立IBGP全连接关系，子AS之间建立联盟EBGP连接关系，但联盟外部AS仍认为联盟是一个AS。
转载于:https://www.cnblogs.com/yu15/p/11290400.html
