L1000

3.16.1  出方向链路负载均衡配置举例

1. 组网需求

用户从两个运营商ISP 1和ISP 2处分别租用了链路Link 1和Link 2，这两条链路的路由器跳数、带宽和成本均相同，但Link 1的网络延迟小于Link 2。通过配置链路负载均衡，使Server B访问Server A时优先选择这两条链路中的最优链路。

2. 组网图

图3-4 出方向链路负载均衡配置组网图

3. 配置步骤

·     配置接口IP地址

<LB> system-view

[LB] interface gigabitethernet 1/0/1

[LB-GigabitEthernet1/0/1] ip address 10.1.1.1 24

[LB-GigabitEthernet1/0/1] quit

[LB] interface gigabitethernet 1/0/2

[LB-GigabitEthernet1/0/2] ip address 20.1.1.1 24

[LB-GigabitEthernet1/0/2] quit

·     配置链路组

# 创建ICMP类型的NQA模板t1，并配置每次探测结果发送机制。

[LB] nqa template icmp t1

[LB-nqatplt-icmp-t1] reaction trigger per-probe

[LB-nqatplt-icmp-t1] quit

# 指定缺省就近性探测方法为t1，并配置就近性计算的网络延迟权值为200。

[LB] loadbalance proximity

[LB-lb-proximity] match default probe t1

[LB-lb-proximity] rtt weight 200

[LB-lb-proximity] quit

# 创建链路组lg，并开启就近性功能。

[LB] loadbalance link-group lg

[LB-lb-lgroup-lg] proximity enable

# 关闭NAT功能。

[LB-lb-lgroup-lg] transparent enable

[LB-lb-lgroup-lg] quit

·     配置链路

# 创建链路link1，配置其下一跳IPv4地址为10.1.1.2，并加入链路组lg。

[LB] loadbalance link link1

[LB-lb-link-link1] router ip 10.1.1.2

[LB-lb-link-link1] link-group lg

[LB-lb-link-link1] quit

# 创建链路link2，配置其下一跳IPv4地址为20.1.1.2，并加入链路组lg。

[LB] loadbalance link link2

[LB-lb-link-link2] router ip 20.1.1.2

[LB-lb-link-link2] link-group lg

[LB-lb-link-link2] quit

·     配置虚服务器

# 创建LINK-IP类型的虚服务器vs，配置其VSIP为通配0.0.0.0/0，指定其缺省主用链路组为lg，并开启此虚服务器。

[LB] virtual-server vs type link-ip

[LB-vs-link-ip-vs] virtual ip address 0.0.0.0 0

[LB-vs-link-ip-vs] default link-group lg

[LB-vs-link-ip-vs] service enable

[LB-vs-link-ip-vs] quit

4. 验证配置

# 显示所有链路的简要信息。

[LB] display loadbalance link brief

Link             Route IP             State          Link group

link1            10.1.1.2             Active         lg

link2            20.1.1.2             Active         lg

# 显示所有链路组的详细信息。

[LB] display loadbalance link-group

Link group: lg

  Description:

  Predictor: Round robin

  Proximity: Enabled

  NAT: Disabled

  SNAT pool:

  Failed action: Keep

  Active threshold: Disabled

  Slow-online: Disabled

  Selected link: Disabled

  Probe information:

    Probe success criteria: All

    Probe method:

    t1

  Total link: 2

  Active link: 2

  Link list:

  Name          State         VPN instance  Router IP            Weight Priority

  link1         Active                      10.1.1.2             100    4

  link2         Active                      20.1.1.2             100    4

# 显示所有虚服务器的详细信息。

[LB] display virtual-server

Virtual server: vs

  Description:

  Type: LINK-IP

  State: Active

  VPN instance:

  Virtual IPv4 address: 0.0.0.0/0

  Virtual IPv6 address: --

  Port: 0

  Primary link group: lg (in use)

  Backup link group:

  Sticky:

  LB policy:

  LB limit-policy:

  Connection limit: --

  Rate limit:

    Connections: --

    Bandwidth: --

    Inbound bandwidth: --

    Outbound bandwidth: --

  Connection synchronization: Disabled

  Sticky synchronization: Disabled

  Bandwidth busy protection: Disabled

  Interface bandwidth statistics: Disabled

  Route advertisement: Disabled

#显示所有IPv4就近性表项的简要信息。

[LB] display loadbalance proximity ip

  IPv4 entries in total: 1

    IPv4 address/Mask length       Timeout     Best link

    ------------------------------------------------------------

    10.1.0.0/24                    50          link1