示例：在路由策略中配置扩展社区
扩展社区在大多数方面与常规社区相似。某些网络实施（如虚拟专用网 （VPN））使用扩展社区，因为 4 个八位字节的常规社区值无法提供足够的扩展和灵活性。扩展社区是一个八个八位字节的值，分为两个主要部分。
要求
配置此示例之前，不需要除设备初始化之外的特殊配置。
概述
在此示例中，设备 R1 和设备 R2 是自治系统 （AS） 64510 中的 OSPF 邻接方。设备 R3 与设备 R1 具有外部 BGP （EBGP） 连接。设备 R2 在 172.16/16 地址空间中有客户网络，使用其环路接口 （lo0） 上的地址进行模拟。设备 R1 有到多个 172.16 的静态路由。x/24网络，并为这些路线赋予常规的社区价值。然后，设备 R1 使用导出策略将路由播发至设备 R3。设备 R3 接收这些路由，并使用导入策略将扩展社区值添加到路由。
拓扑结构
图 1 显示了示例网络。
图 1：扩展 BGP 社区
的拓扑结构
的拓扑结构
#configuration587__policy-extended-community-st 部分介绍了设备 R3 上的步骤。
配置
CLI 快速配置
要快速配置此示例，请复制以下命令，将其粘贴到文本文件中，删除所有换行符，更改详细信息，以便与网络配置匹配，然后将命令复制并粘贴到层次结构级别的 [edit] CLI 中。
设备 R1
set interfaces fe-1/2/0 unit 0 family inet address 10.0.0.1/30 set interfaces fe-1/2/3 unit 0 family inet address 10.0.0.14/30 set interfaces lo0 unit 0 family inet address 192.168.0.1/32 primary set protocols bgp group ext type external set protocols bgp group ext export send-static set protocols bgp group ext peer-as 64511 set protocols bgp group ext neighbor 10.0.0.13 set protocols ospf area 0.0.0.0 interface fe-1/2/0.0 set protocols ospf area 0.0.0.0 interface lo0.0 passive set policy-options policy-statement send-static term 1 from protocol static set policy-options policy-statement send-static term 1 then accept set routing-options static route 172.16.1.0/24 next-hop 10.0.0.2 set routing-options static route 172.16.1.0/24 community 64510:1 set routing-options static route 172.16.2.0/24 next-hop 10.0.0.2 set routing-options static route 172.16.2.0/24 community 64510:2 set routing-options static route 172.16.3.0/24 next-hop 10.0.0.2 set routing-options static route 172.16.3.0/24 community 64510:3 set routing-options static route 172.16.4.0/24 next-hop 10.0.0.2 set routing-options static route 172.16.4.0/24 community 64510:4 set routing-options router-id 192.168.0.1 set routing-options autonomous-system 64510
设备 R2
set interfaces fe-1/2/0 unit 0 family inet address 10.0.0.2/30 set interfaces lo0 unit 0 family inet address 192.168.0.2/32 set interfaces lo0 unit 0 family inet address 172.16.1.1/32 set interfaces lo0 unit 0 family inet address 172.16.2.2/32 set interfaces lo0 unit 0 family inet address 172.16.3.3/32 set interfaces lo0 unit 0 family inet address 172.16.4.4/32 set protocols ospf area 0.0.0.0 interface fe-1/2/0.0 set protocols ospf area 0.0.0.0 interface lo0.0 passive set routing-options router-id 192.168.0.2 set routing-options autonomous-system 64510
设备 R3
set interfaces fe-1/2/3 unit 0 family inet address 10.0.0.13/30 set interfaces lo0 unit 0 family inet address 192.168.0.3/32 set protocols bgp group to-R1 type external set protocols bgp group to-R1 import set-ext-comms set protocols bgp group to-R1 peer-as 64510 set protocols bgp group to-R1 neighbor 10.0.0.14 set policy-options policy-statement set-ext-comms term route-1 from route-filter 172.16.1.0/24 exact set policy-options policy-statement set-ext-comms term route-1 then community add target-as set policy-options policy-statement set-ext-comms term route-1 then accept set policy-options policy-statement set-ext-comms term route-2 from route-filter 172.16.2.0/24 exact set policy-options policy-statement set-ext-comms term route-2 then community add target-ip set policy-options policy-statement set-ext-comms term route-2 then accept set policy-options policy-statement set-ext-comms term route-3 from route-filter 172.16.3.0/24 exact set policy-options policy-statement set-ext-comms term route-3 then community add origin-as set policy-options policy-statement set-ext-comms term route-3 then accept set policy-options policy-statement set-ext-comms term route-4 from route-filter 172.16.4.0/24 exact set policy-options policy-statement set-ext-comms term route-4 then community add origin-ip set policy-options policy-statement set-ext-comms term route-4 then accept set policy-options community origin-as members origin:64511:3 set policy-options community origin-ip members origin:172.16.7.7:4 set policy-options community target-as members target:64511:1 set policy-options community target-ip members target:172.16.7.7:2 set routing-options router-id 192.168.0.3 set routing-options autonomous-system 64511
过程
分步程序
下面的示例要求您在各个配置层级中进行导航。有关导航CLI的信息，请参阅《Junos OS CLI 用户指南》中的在配置模式下使用CLI编辑器。
要配置设备 R3：
配置接口。
[edit interfaces] user@R3# set fe-1/2/3 unit 0 family inet address 10.0.0.13/30 user@R3# set lo0 unit 0 family inet address 192.168.0.3/32
配置到设备 R1 的 EBGP 连接。
[edit protocols bgp group to-R1] user@R3# set type external user@R3# set import set-ext-comms user@R3# set peer-as 64510 user@R3# set neighbor 10.0.0.14
-
配置将扩展社区值添加到从设备 R1 接收的路由的策略。
扩展社区使用 表示法
type:administrator:assigned-number.特定的社区值可以是在某些参数内实现管理目标的任何内容，如 社区（策略选项）中所述。
[edit policy-options policy-statement set-ext-comms] user@R3# set term route-1 from route-filter 172.16.1.0/24 exact user@R3# set term route-1 then community add target-as user@R3# set term route-1 then accept user@R3# set term route-2 from route-filter 172.16.2.0/24 exact user@R3# set term route-2 then community add target-ip user@R3# set term route-2 then accept user@R3# set term route-3 from route-filter 172.16.3.0/24 exact user@R3# set term route-3 then community add origin-as user@R3# set term route-3 then accept user@R3# set term route-4 from route-filter 172.16.4.0/24 exact user@R3# set term route-4 then community add origin-ip user@R3# set term route-4 then accept [edit policy-options] user@R3# set community origin-as members origin:64511:3 user@R3# set community origin-ip members origin:172.16.7.7:4 user@R3# set community target-as members target:64511:1 user@R3# set community target-ip members target:172.16.7.7:2
配置自治系统 （AS） 编号和路由器 ID。
[edit routing-options] user@R3# set router-id 192.168.0.3 user@R3# set autonomous-system 64511
结果
在配置模式下，输入 show interfaces、 show protocols、 show policy-options和 show routing-options 命令以确认您的配置。如果输出未显示预期的配置，请重复此示例中的说明以更正配置。
user@R3# show interfaces
fe-1/2/3 {
unit 0 {
family inet {
address 10.0.0.13/30;
}
}
}
lo0 {
unit 0 {
family inet {
address 192.168.0.3/32;
}
}
}
user@R3# show protocols
bgp {
group to-R1 {
type external;
import set-ext-comms;
peer-as 64510;
neighbor 10.0.0.14;
}
}
user@R3# show policy-options
policy-statement set-ext-comms {
term route-1 {
from {
route-filter 172.16.1.0/24 exact;
}
then {
community add target-as;
accept;
}
}
term route-2 {
from {
route-filter 172.16.2.0/24 exact;
}
then {
community add target-ip;
accept;
}
}
term route-3 {
from {
route-filter 172.16.3.0/24 exact;
}
then {
community add origin-as;
accept;
}
}
term route-4 {
from {
route-filter 172.16.4.0/24 exact;
}
then {
community add origin-ip;
accept;
}
}
}
community origin-as members origin:64511:3;
community origin-ip members origin:172.16.7.7:4;
community target-as members target:64511:1;
community target-ip members target:172.16.7.7:2;
user@R3# show routing-options router-id 192.168.0.3; autonomous-system 64511;
如果完成设备配置，请从配置模式进入。commit
验证
确认配置工作正常。
验证设备 R1 上的路由
目的
在设备 R1 上，检查 172.16。路由路由表。
行动
user@R1> show route protocol static match-prefix 172.16.* detail
inet.0: 15 destinations, 15 routes (15 active, 0 holddown, 0 hidden)
172.16.1.0/24 (1 entry, 1 announced)
*Static Preference: 5
Next hop type: Router, Next hop index: 835
Address: 0x9260250
Next-hop reference count: 19
Next hop: 10.0.0.2 via fe-1/2/0.0, selected
State: <Active Int Ext>
Local AS: 64510
Age: 2:06:08
Task: RT
Announcement bits (2): 2-KRT 3-BGP_RT_Background
AS path: I
Communities: 64510:1
172.16.2.0/24 (1 entry, 1 announced)
*Static Preference: 5
Next hop type: Router, Next hop index: 835
Address: 0x9260250
Next-hop reference count: 19
Next hop: 10.0.0.2 via fe-1/2/0.0, selected
State: <Active Int Ext>
Local AS: 64510
Age: 2:06:08
Task: RT
Announcement bits (2): 2-KRT 3-BGP_RT_Background
AS path: I
Communities: 64510:2
172.16.3.0/24 (1 entry, 1 announced)
*Static Preference: 5
Next hop type: Router, Next hop index: 835
Address: 0x9260250
Next-hop reference count: 19
Next hop: 10.0.0.2 via fe-1/2/0.0, selected
State: <Active Int Ext>
Local AS: 64510
Age: 2:06:08
Task: RT
Announcement bits (2): 2-KRT 3-BGP_RT_Background
AS path: I
Communities: 64510:3
172.16.4.0/24 (1 entry, 1 announced)
*Static Preference: 5
Next hop type: Router, Next hop index: 835
Address: 0x9260250
Next-hop reference count: 19
Next hop: 10.0.0.2 via fe-1/2/0.0, selected
State: <Active Int Ext>
Local AS: 64510
Age: 2:06:08
Task: RT
Announcement bits (2): 2-KRT 3-BGP_RT_Background
AS path: I
Communities: 64510:4
意义
输出显示常规社区值已附加到路由。
注意：
社区连接到静态路由，从而证明社区可以连接到非 BGP 路由。
验证设备 R3 上的路由
目的
在设备 R3 上，检查 172.16。路由路由表。
行动
user@R3> show route protocol bgp match-prefix 172.16.* detail
betsy@tp5# run show route protocol bgp match-prefix 172.16.* detail logical-system R3
inet.0: 7 destinations, 7 routes (7 active, 0 holddown, 0 hidden)
172.16.1.0/24 (1 entry, 1 announced)
*BGP Preference: 170/-101
Next hop type: Router, Next hop index: 611
Address: 0x9260130
Next-hop reference count: 8
Source: 10.0.0.14
Next hop: 10.0.0.14 via fe-1/2/3.0, selected
State: <Active Ext>
Local AS: 64511 Peer AS: 64510
Age: 1:57:27
Task: BGP_64510.10.0.0.14+54618
Announcement bits (1): 0-KRT
AS path: 64510 I
Communities: 64510:1 target:64511:1
Accepted
Localpref: 100
Router ID: 192.168.0.1
172.16.2.0/24 (1 entry, 1 announced)
*BGP Preference: 170/-101
Next hop type: Router, Next hop index: 611
Address: 0x9260130
Next-hop reference count: 8
Source: 10.0.0.14
Next hop: 10.0.0.14 via fe-1/2/3.0, selected
State: <Active Ext>
Local AS: 64511 Peer AS: 64510
Age: 1:57:27
Task: BGP_64510.10.0.0.14+54618
Announcement bits (1): 0-KRT
AS path: 64510 I
Communities: 64510:2 target:172.16.7.7:2
Accepted
Localpref: 100
Router ID: 192.168.0.1
172.16.3.0/24 (1 entry, 1 announced)
*BGP Preference: 170/-101
Next hop type: Router, Next hop index: 611
Address: 0x9260130
Next-hop reference count: 8
Source: 10.0.0.14
Next hop: 10.0.0.14 via fe-1/2/3.0, selected
State: <Active Ext>
Local AS: 64511 Peer AS: 64510
Age: 1:57:27
Task: BGP_64510.10.0.0.14+54618
Announcement bits (1): 0-KRT
AS path: 64510 I
Communities: 64510:3 origin:64511:3
Accepted
Localpref: 100
Router ID: 192.168.0.1
172.16.4.0/24 (1 entry, 1 announced)
*BGP Preference: 170/-101
Next hop type: Router, Next hop index: 611
Address: 0x9260130
Next-hop reference count: 8
Source: 10.0.0.14
Next hop: 10.0.0.14 via fe-1/2/3.0, selected
State: <Active Ext>
Local AS: 64511 Peer AS: 64510
Age: 1:57:27
Task: BGP_64510.10.0.0.14+54618
Announcement bits (1): 0-KRT
AS path: 64510 I
Communities: 64510:4 origin:172.16.7.7:4
Accepted
Localpref: 100
Router ID: 192.168.0.1
意义
输出显示常规社区值仍附加到路由，并添加了扩展社区值。