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HUAWE配置BGP MED属性控制路由选路

2013-08-04 22:44:44 来源:www.45fan.com 【

组网需求

所有路由器都配置 BGP,R1 属于 AS 65008,R2、R3 属于 AS 65009。

R1 与 R2、R3 之间运行 EBGP,R2 与 R3 之间运行 IBGP。

R2、R3 发布 10.1.23.0/24 网段

 

配置思路

R1 与 R2、R3 之间配置 EBGP 连接,R2、R3 之间配置 IBGP 连接。

方案一:通过路由策略调大 R2 发给 R1 的 MED 值,使得 R1 选择 R3 作为出口。

方案二:通过路由策略调大 R1 接收 R2 的 MED 值,使得 R1 选择 R3 作为出口。

配置步骤

1、配置接口 IP 地址

2、配置 AS 65009 IGP

3、配置 BGP 连接

      dis bgp routing-table 10.1.23.0

      BGP local router ID : 1.1.1.1

  Local AS number : 65008

  Paths: 2 available, 1 best, 1 select

  BGP routing table entry information of 10.1.23.0/24:

  From: 10.1.12.2 (2.2.2.2)

  Route Duration: 00h02m57s

  Direct Out-interface: GigabitEthernet0/0/0

  Original nexthop: 10.1.12.2

  Qos information : 0x0

  AS-path 65009, origin igp, MED 0, pref-val 0, valid, external, best, select, active, pre 255

  Advertised to such 2 peers:

  10.1.13.3

  10.1.12.2

  BGP routing table entry information of 10.1.23.0/24:

  From: 10.1.13.3 (3.3.3.3)

  Route Duration: 00h02m57s

  Direct Out-interface: GigabitEthernet0/0/1

  Original nexthop: 10.1.13.3

  Qos information : 0x0

  AS-path 65009, origin igp, MED 0, pref-val 0, valid, external, pre 255, not preferred for router ID

  Not advertised to any peer yet

  4、配置 MED 属性

  方案一:

  ==========R1==========

  #

  route-policy set_med_in permit node 10

  apply cost 100

  #

  bgp 65008

  #

  ipv4-family unicast

  peer 10.1.12.2 route-policy set_med_in import

  #

  dis bgp routing-table 10.1.23.0

  BGP local router ID : 1.1.1.1

  Local AS number : 65008

  Paths: 2 available, 1 best, 1 select

  BGP routing table entry information of 10.1.23.0/24:

  From: 10.1.13.3 (3.3.3.3)

  Route Duration: 01h20m40s

  Direct Out-interface: GigabitEthernet0/0/1

  Original nexthop: 10.1.13.3

  Qos information : 0x0

  AS-path 65009, origin igp, MED 0, pref-val 0, valid, external, best, select, active, pre 255

  Advertised to such 2 peers:

  10.1.13.3

  10.1.12.2

  BGP routing table entry information of 10.1.23.0/24:

  From: 10.1.12.2 (2.2.2.2)

  Route Duration: 01h09m55s

  Direct Out-interface: GigabitEthernet0/0/0

  Original nexthop: 10.1.12.2

  Qos information : 0x0

  AS-path 65009, origin igp, MED 100, pref-val 0, valid, external, pre 255, not preferred for MED

  Not advertised to any peer yet

  方案二:

  ==========R2==========

  #

  route-policy set_med_out permit node 10

  apply cost 200

  #

  bgp 65009

  #

  ipv4-family unicast

  peer 10.1.12.1 route-policy set_med_out export

  #

  dis bgp routing-table 10.1.23.0

  BGP local router ID : 1.1.1.1

  Local AS number : 65008

  Paths: 2 available, 1 best, 1 select

  BGP routing table entry information of 10.1.23.0/24:

  From: 10.1.13.3 (3.3.3.3)

  Route Duration: 00h00m13s

  Direct Out-interface: GigabitEthernet0/0/1

  Original nexthop: 10.1.13.3

  Qos information : 0x0

  AS-path 65009, origin igp, MED 0, pref-val 0, valid, external, best, select, active, pre 255

  Advertised to such 2 peers:

  10.1.12.2

  10.1.13.3

  BGP routing table entry information of 10.1.23.0/24:

  From: 10.1.12.2 (2.2.2.2)

  Route Duration: 00h00m14s

  Direct Out-interface: GigabitEthernet0/0/0

  Original nexthop: 10.1.12.2

  Qos information : 0x0

  AS-path 65009, origin igp, MED 200, pref-val 0, valid, external, pre 255, not preferred for MED

  Not advertised to any peer yet

  配置文件

  ==========R1==========

  #

  sysname R1

  #

  interface GigabitEthernet0/0/0

  ip address 10.1.12.1 255.255.255.0

  #

  interface GigabitEthernet0/0/1

  ip address 10.1.13.1 255.255.255.0

  #

  interface LoopBack0

  ip address 1.1.1.1 255.255.255.255

  #

  bgp 65008

  router-id 1.1.1.1

  peer 10.1.12.2 as-number 65009

  peer 10.1.13.3 as-number 65009

  #

  ipv4-family unicast

  undo synchronization

  peer 10.1.12.2 enable

  peer 10.1.13.3 enable

  #

  route-policy set_med_in permit node 10

  apply cost 100

  #

  ==========R2==========

  #

  sysname R2

  #

  interface GigabitEthernet0/0/0

  ip address 10.1.12.2 255.255.255.0

  #

  interface GigabitEthernet0/0/1

  ip address 10.1.23.2 255.255.255.0

  #

  interface LoopBack0

  ip address 2.2.2.2 255.255.255.255

  #

  bgp 65009

  router-id 2.2.2.2

  peer 3.3.3.3 as-number 65009

  peer 3.3.3.3 connect-interface LoopBack0

  peer 10.1.12.1 as-number 65008

  #

  ipv4-family unicast

  undo synchronization

  network 10.1.23.0 255.255.255.0

  peer 3.3.3.3 enable

  peer 10.1.12.1 enable

  peer 10.1.12.1 route-policy set_med_out export

  #

  ospf 110 router-id 2.2.2.2

  area 0.0.0.0

  network 2.2.2.2 0.0.0.0

  network 10.1.23.0 0.0.0.255

  #

  route-policy set_med_out permit node 10

  apply cost 200

  #

  ==========R3==========

  #

  sysname R3

  #

  interface GigabitEthernet0/0/0

  ip address 10.1.13.3 255.255.255.0

  #

  interface GigabitEthernet0/0/1

  ip address 10.1.23.3 255.255.255.0

  #

  interface LoopBack0

  ip address 3.3.3.3 255.255.255.255

  #

  bgp 65009

  router-id 3.3.3.3

  peer 2.2.2.2 as-number 65009

  peer 2.2.2.2 connect-interface LoopBack0

  peer 10.1.13.1 as-number 65008

  #

  ipv4-family unicast

  undo synchronization

  network 10.1.23.0 255.255.255.0

  peer 2.2.2.2 enable

  peer 10.1.13.1 enable

  #

  ospf 110 router-id 3.3.3.3

  area 0.0.0.0

  network 3.3.3.3 0.0.0.0

  network 10.1.23.0 0.0.0.255

  #


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