技术支持文档中心交换机园区交换机S1700&S2700配置调测配置指南

S1720, S2700, S5700, S6720 V200R011C10 配置指南-IP单播路由

本文档介绍了设备支持的IP单播路由相关配置。主要内容包括IP路由概述，静态路由、RIP、RIPng、OSPF、OSPFv3、IS-IS（IPv4）、IS-IS（IPv6）、BGP、路由策略以及策略路由的基本原理和配置过程，并提供相关的配置案例。

配置BGP负载分担示例

配置BGP负载分担示例

组网需求

如图10-53所示，所有交换机都配置BGP，SwitchA在AS100中，SwitchB和SwitchC在AS300中，SwitchD在AS200中。要求减少SwitchA到目的地址10.1.1.0/24网络拥塞，充分利用网络资源。

请确保该场景下互联接口的STP处于未使能状态。因为在使能STP的环形网络中，如果用交换机的VLANIF接口构建三层网络，会导致某个端口被阻塞，从而导致三层业务不能正常运行。

图10-53  配置BGP负载分担组网图

配置思路

采用如下的思路配置BGP负载分担：

  1. 在SwitchA和SwitchB、SwitchA和SwitchC、SwitchD和SwitchB、SwitchD和SwitchC之间配置EBGP连接，实现AS之间使用BGP协议相互通信。

  2. 在SwitchA上配置负载分担功能，使从SwitchA发送的流量可以经过SwitchB和SwitchC两条路径到达SwitchD，实现对网络资源的充分利用。

操作步骤

  1. 配置各接口所属VLAN

    # 配置SwitchA。SwitchB、SwitchC和SwitchD的配置与SwitchA类似。

    <HUAWEI> system-view
[HUAWEI] sysname SwitchA
[SwitchA] vlan batch 10 20
[SwitchA] interface gigabitethernet 0/0/1
[SwitchA-GigabitEthernet0/0/1] port link-type trunk
[SwitchA-GigabitEthernet0/0/1] port trunk allow-pass vlan 10
[SwitchA-GigabitEthernet0/0/1] quit
[SwitchA] interface gigabitethernet 0/0/2
[SwitchA-GigabitEthernet0/0/2] port link-type trunk
[SwitchA-GigabitEthernet0/0/2] port trunk allow-pass vlan 20
[SwitchA-GigabitEthernet0/0/2] quit

  2. 配置各VLANIF接口的IP地址

    # 配置SwitchA。SwitchB、SwitchC和SwitchD的配置与SwitchA类似。

    [SwitchA] interface vlanif 10
[SwitchA-Vlanif10] ip address 192.168.1.1 24
[SwitchA-Vlanif10] quit
[SwitchA] interface vlanif 20
[SwitchA-Vlanif20] ip address 192.168.2.1 24
[SwitchA-Vlanif20] quit

  3. 配置BGP连接

    # 配置SwitchA。

    [SwitchA] bgp 100
[SwitchA-bgp] router-id 172.16.1.1
[SwitchA-bgp] peer 192.168.1.2 as-number 300
[SwitchA-bgp] peer 192.168.2.2 as-number 300
[SwitchA-bgp] quit

    # 配置SwitchB。

    [SwitchB] bgp 300
[SwitchB-bgp] router-id 172.16.2.2
[SwitchB-bgp] peer 192.168.1.1 as-number 100
[SwitchB-bgp] peer 192.168.3.1 as-number 200
[SwitchB-bgp] quit

    # 配置SwitchC。

    [SwitchC] bgp 300
[SwitchC-bgp] router-id 172.16.3.3
[SwitchC-bgp] peer 192.168.2.1 as-number 100
[SwitchC-bgp] peer 192.168.4.1 as-number 200
[SwitchC-bgp] quit

    # 配置SwitchD。

    [SwitchD] bgp 200
[SwitchD-bgp] router-id 172.16.4.4
[SwitchD-bgp] peer 192.168.3.2 as-number 300
[SwitchD-bgp] peer 192.168.4.2 as-number 300
[SwitchD-bgp] ipv4-family unicast
[SwitchD-bgp-af-ipv4] network 10.1.1.0 255.255.255.0
[SwitchD-bgp-af-ipv4] quit
[SwitchD-bgp] quit

    # 查看SwitchA的路由表。

    [SwitchA] display bgp routing-table 10.1.1.0 24

 BGP local router ID : 172.16.1.1
 Local AS number : 100
 Paths:   2 available, 1 best, 1 select
 BGP routing table entry information of 10.1.1.0/24:
 From: 192.168.1.2 (172.16.2.2)
 Route Duration: 0d00h00m50s
 Direct Out-interface: Vlanif10
 Original nexthop: 192.168.1.2
 Qos information : 0x0
 AS-path 300 200, origin igp, pref-val 0, valid, external, best, select, active, pre 255
 Advertised to such 2 peers:
    192.168.2.2
    192.168.1.2
 BGP routing table entry information of 10.1.1.0/24:
 From: 192.168.2.2 (172.16.3.3)
 Route Duration: 0d00h00m51s
 Direct Out-interface: Vlanif20
 Original nexthop: 192.168.2.2
 Qos information : 0x0
 AS-path 300 200, origin igp, pref-val 0, valid, external, pre 255, not preferred for router ID
 Not advertised to any peer yet

    从路由表中可以看出，SwitchA到目的地址10.1.1.0/24有两条有效路由，其中下一跳为192.168.1.2的路由是最优路由（因为SwitchB的Router ID要小一些）。

  4. 配置负载分担

    # 在SwitchA上配置负载分担。

    [SwitchA] bgp 100
[SwitchA-bgp] ipv4-family unicast
[SwitchA-bgp-af-ipv4] maximum load-balancing 2
[SwitchA-bgp-af-ipv4] quit
[SwitchA-bgp] quit

  5. 检查配置结果

    # 查看SwitchA的路由表。

    [SwitchA] display bgp routing-table 10.1.1.0 24

 BGP local router ID : 172.16.1.1
 Local AS number : 100
 Paths:   2 available, 1 best, 2 select
 BGP routing table entry information of 10.1.1.0/24:
 From: 192.168.1.2 (172.16.2.2)
 Route Duration: 0d00h03m55s
 Direct Out-interface: Vlanif10
 Original nexthop: 192.168.1.2
 Qos information : 0x0
 AS-path 300 200, origin igp, pref-val 0, valid, external, best, select, active, pre 255
 Advertised to such 2 peers:
    192.168.2.2
    192.168.1.2
 BGP routing table entry information of 10.1.1.0/24:
 From: 192.168.2.2 (172.16.3.3)
 Route Duration: 0d00h03m56s
 Direct Out-interface: Vlanif20
 Original nexthop: 192.168.2.2
 Qos information : 0x0
 AS-path 300 200, origin igp, pref-val 0, valid, external, select, active, pre 255, not preferred for router ID
 Not advertised to any peer yet

    从路由表中可以看到，BGP路由10.1.1.0/24存在两个下一跳，分别是192.168.1.2和192.168.2.2，且都被优选。

配置文件

  • SwitchA的配置文件

    #
sysname SwitchA
#
vlan batch 10 20
#
interface Vlanif10
 ip address 192.168.1.1 255.255.255.0
#
interface Vlanif20
 ip address 192.168.2.1 255.255.255.0
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 10
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 20
#
bgp 100
 router-id 172.16.1.1
 peer 192.168.1.2 as-number 300
 peer 192.168.2.2 as-number 300
 #
 ipv4-family unicast
  undo synchronization
  maximum load-balancing 2
  peer 192.168.1.2 enable
  peer 192.168.2.2 enable
#
return

  • SwitchB的配置文件

    #
sysname SwitchB
#
vlan batch 10 30
#
interface Vlanif10
 ip address 192.168.1.2 255.255.255.0
#
interface Vlanif30
 ip address 192.168.3.2 255.255.255.0
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 10
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 30
#
bgp 300
 router-id 172.16.2.2
 peer 192.168.1.1 as-number 100
 peer 192.168.3.1 as-number 200
 #
 ipv4-family unicast
  undo synchronization
  peer 192.168.1.1 enable
  peer 192.168.3.1 enable
#
return

  • SwitchC的配置文件

    #
sysname SwitchC
#
vlan batch 20 40
#
interface Vlanif20
 ip address 192.168.2.2 255.255.255.0
#
interface Vlanif40
 ip address 192.168.4.2 255.255.255.0
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 40
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 20
#
bgp 300
 router-id 172.16.3.3
 peer 192.168.2.1 as-number 100
 peer 192.168.4.1 as-number 200
 #
 ipv4-family unicast
  undo synchronization
  peer 192.168.2.1 enable
  peer 192.168.4.1 enable
#
return

  • SwitchD的配置文件

    #
sysname SwitchD
#
vlan batch 30 40 50
#
interface Vlanif30
 ip address 192.168.3.1 255.255.255.0
#
interface Vlanif40
 ip address 192.168.4.1 255.255.255.0
#
interface Vlanif50
 ip address 10.1.1.1 255.255.255.0
#
interface GigabitEthernet0/0/1
 port link-type trunk
 port trunk allow-pass vlan 40
#
interface GigabitEthernet0/0/2
 port link-type trunk
 port trunk allow-pass vlan 30
#
interface GigabitEthernet0/0/3
 port link-type trunk
 port trunk allow-pass vlan 50
#
bgp 200
 router-id 172.16.4.4
 peer 192.168.3.2 as-number 300
 peer 192.168.4.2 as-number 300
 #
 ipv4-family unicast
  undo synchronization
  network 10.1.1.0 255.255.255.0
  peer 192.168.3.2 enable
  peer 192.168.4.2 enable
#
return