H3C_S7500E_BGP路由属性控制路由选择典型配置举例

Vlan-int 12 12.12.12.1/24
Vlan-int 46 46.46.46.4/24
Vlan-int 46 46.46.46.6/24
Internet AS 400
Loop0 6.6.6.6/32
Device A
Vlan-int 13 13.13.13.1/24
ISP 2 AS 300
3 通过AS-Path属性控制路由选择典型配置举例
3.1 组网需求
如 图 1 所示，所有设备均运行BGP协议。AS 100 和AS 400 之间有两条路径可以通信，这两条路径 分别经过AS 200 和AS 300。现要求通过配置路由策略，实现： • AS 100 内的设备访问 AS 200 始发的路由时，优先选择从 Device D 转发； • AS 100 内的设备访问 AS 300 始发的路由时，优先选择从 Device E 转发； • AS 100 内的设备访问 AS 400 始发的路由时，优先选择从 Device D 转发。 图1 AS-Path 属性控制路由选择配置组网图
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1
3.2 配置思路
• 为了使 AS 100 内的设备能够根据路由的始发 AS 号来选择优先转发路径，需要在 AS 100 的 边缘设备上为特定 AS 始发的路由提高优先级，并将该路由扩散至 AS 100 内部： { 在 Device B 上配置路由策略，将从 AS 200 或 AS 400 始发的路由的本地优先级设置为 300； { 在 Device C 上配置路由策略，将从 AS 300 始发的路由的本地优先级设置为 200。
# 请参考以上方法配置其它相关接口的 IP 地址，配置步骤这里省略。
3.4.2 配置BGP连接
# 在 Device A 上创建本地 AS 号为 100 的 BGP 实例，指定对等体 12.12.12.2 和 13.13.13.3。
[DeviceA] bgp 100 [DeviceA-bgp] router-id 1.1.1.1 [DeviceA-bgp] peer 12.12.12.2 as-number 100 [DeviceA-bgp] peer 13.13.13.3 as-number 100 [DeviceA-bgp] address-family ipv4 unicast [DeviceA-bgp-ipv4] peer 12.12.12.2 enable [DeviceA-bgp-ipv4] peer 13.13.13.3 enable [DeviceA-bgp-ipv4] quit [DeviceA-bgp] quit
• 使用 AS 路径过滤列表来匹配由指定 AS 始发的路由。
3.3 使用版本
本举例是在 S7500E-CMW710-R7150 版本上进行配置和验证的。
3.4 配置步骤
3.4.1 配置各接口的IP地址
# 配置接口 Vlan-interface 12 的 IP 地址。
<DeviceA> system-view [DeviceA] interface Vlan-interface 12 [DeviceA-Vlan-interface12] ip address 12.12.12.1 24 [DeviceA-Vlan-interface12] quit
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1 简介
本文档介绍使用通过 BGP 路由属性控制路由选择的配置举例。
2 配置前提
本文档中的配置均是在实验室环境下进行的配置和验证，配置前设备的所有参数均采用出厂时的缺 省配置。如果您已经对设备进行了配置，为了保证配置效果，请确认现有配置和以下举例中的配置 不冲突。 本文档假设您已了解 BGP 特性和路由策略特性。
3.4.1 配置各接口的IP地址 ·················································································································· 2 3.4.2 配置BGP连接·····························································································································2 3.4.3 配置路由策略 ····························································································································· 4 3.5 验证配置 ··············································································································································· 5 3.6 配置文件 ··············································································································································· 5 4 通过MED属性控制路由选择典型配置举例 ···························································································· 9 4.1 组网需求 ··············································································································································· 9 4.2 配置思路 ············································································································································· 10 4.3 使用版本 ············································································································································· 10 4.4 配置步骤 ············································································································································· 10 4.4.1 基础配置 ·································································································································· 10 4.4.2 配置路由策略 ··························································································································· 12 4.5 验证配置 ············································································································································· 12 4.6 配置文件 ············································································································································· 12 5 相关资料 ············································································································································· 14
AS 100
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ISP 1
AS 200 Loop0
4.4.4.4/32
Vlan-int 24 24.24.24.2/24
Device B
Vlan-int 12 12.12.12.2/24
Vlan-int 24 24.24.24.4/24
Device D
H3C S7500E BGP 路由属性控制路由选择典 型配置举例
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目录
1 简介 ······················································································································································ 1 2 配置前提 ··············································································································································· 1 3 通过AS-Path属性控制路由选择典型配置举例 ······················································································· 1
3.1 组网需求 ··············································································································································· 1 3.2 配置思路 ··············································································································································· 2 3.3 使用版本 ··············································································································································· 2 3.4 配置步骤 ··············································································································································· 2
Device F
Vlan-int 56 56.56.56.6/24
Vlan-int 13 13.13.13.3/24
Device C
ຫໍສະໝຸດ Baidu
Device E Vlan-int 35
35.35.35.5/24
Vlan-int 35
35.35.35.3/24
Vlan-int 56 56.56.56.5/24
Loop0 3.3.3.3/32