配置本地MT特性示例

组网需求

如图1所示，网络中同时部署了组播和MPLS TE-Tunnel，且TE-Tunnel配置了IGP Shortcut，IGP计算出来的路由的出接口可能不再是实际的物理接口，而是TE-Tunnel接口。交换机根据到达组播源地址的单播路由，从TE-Tunnel接口发送组播加入报文，这样，被TE-Tunnel跨越的交换机就无法感知到组播加入报文，因而不会建立组播转发表项。为了解决上述问题，在SwitchB上配置OSPF本地MT功能。如果计算出来的路由出接口为IGP-Shortcut类型的TE-Tunnel，路由管理模块会为组播协议创建单独的MIGP路由表，并为该路由计算出实际的物理出接口，将其加入到MIGP路由表中，组播利用MIGP路由表中的路由进行转发。

图1 配置OSPF本地MT特性组网图

 

配置思路

采用如下的思路配置本地MT特性：

1. 在各交换机上配置OSPF基本功能，实现OSPF网络的基本互通。
2. 在各交换机上配置组播PIM-SM，使Host能够接收到Source发送的组播数据。
3. 在SwitchB、SwitchC和SwitchD上配置MPLS RSVP-TE隧道功能，并在SwitchB上配置MPLS TE隧道接口，建立一条从SwitchB到SwitchD的TE隧道。
4. 在SwitchB上配置IGP-Shortcut功能，实现SwitchB使用TE隧道接口作为出接口。
5. 在SwitchB上配置OSPF本地MT功能，实现原来出接口为TE-Tunnel的路由，其下一跳在MIGP路由表中均被计算为物理出接口。

操作步骤

1. 配置各接口所属VLAN
2. # 配置SwitchA。SwitchB、SwitchC、SwitchD和SwitchE的配置与SwitchA类似。

<HUAWEI> system-view
[HUAWEI] sysname SwitchA
[SwitchA] vlan batch 10 20
[SwitchA] interface gigabitethernet 1/0/1
[SwitchA-GigabitEthernet1/0/1] port link-type access
[SwitchA-GigabitEthernet1/0/1] port default vlan 10
[SwitchA-GigabitEthernet1/0/1] quit
[SwitchA] interface gigabitethernet 1/0/2
[SwitchA-GigabitEthernet1/0/2] port link-type trunk
[SwitchA-GigabitEthernet1/0/2] port trunk allow-pass vlan 20
[SwitchA-GigabitEthernet1/0/2] quit

1. 配置各VLANIF和LoopBack接口的IP地址
2. # 配置SwitchA。SwitchB、SwitchC、SwitchD和SwitchE的配置与SwitchA类似。

[SwitchA] interface loopback 0
[SwitchA-LoopBack0] ip address 10.1.1.1 32
[SwitchA-LoopBack0] quit
[SwitchA] interface vlanif 10
[SwitchA-Vlanif10] ip address 172.16.1.1 24
[SwitchA-Vlanif10] quit
[SwitchA] interface vlanif 20
[SwitchA-Vlanif20] ip address 10.0.0.1 24
[SwitchA-Vlanif20] quit

1. 配置OSPF基本功能
2. # 配置SwitchA。

[SwitchA] router id 10.1.1.1
[SwitchA] ospf 1
[SwitchA-ospf-1] area 0
[SwitchA-ospf-1-area-0.0.0.0] network 10.1.1.1 0.0.0.0
[SwitchA-ospf-1-area-0.0.0.0] network 10.0.0.0 0.0.0.255
[SwitchA-ospf-1-area-0.0.0.0] network 172.16.1.0 0.0.0.255
[SwitchA-ospf-1-area-0.0.0.0] quit
[SwitchA-ospf-1] quit

1. # 配置SwitchB。

[SwitchB] router id 10.2.2.2
[SwitchB] ospf 1
[SwitchB-ospf-1] area 0
[SwitchB-ospf-1-area-0.0.0.0] network 10.2.2.2 0.0.0.0
[SwitchB-ospf-1-area-0.0.0.0] network 10.0.0.0 0.0.0.255
[SwitchB-ospf-1-area-0.0.0.0] network 10.0.1.0 0.0.0.255
[SwitchB-ospf-1-area-0.0.0.0] quit
[SwitchB-ospf-1] quit

1. # 配置SwitchC。

[SwitchC] router id 10.3.3.3
[SwitchC] ospf 1
[SwitchC-ospf-1] area 0
[SwitchC-ospf-1-area-0.0.0.0] network 10.3.3.3 0.0.0.0
[SwitchC-ospf-1-area-0.0.0.0] network 10.0.1.0 0.0.0.255
[SwitchC-ospf-1-area-0.0.0.0] network 10.0.2.0 0.0.0.255
[SwitchC-ospf-1-area-0.0.0.0] quit
[SwitchC-ospf-1] quit

1. # 配置SwitchD。

[SwitchD] router id 10.4.4.4
[SwitchD] ospf 1
[SwitchD-ospf-1] area 0
[SwitchD-ospf-1-area-0.0.0.0] network 10.4.4.4 0.0.0.0
[SwitchD-ospf-1-area-0.0.0.0] network 10.0.2.0 0.0.0.255
[SwitchD-ospf-1-area-0.0.0.0] network 10.0.3.0 0.0.0.255
[SwitchD-ospf-1-area-0.0.0.0] quit
[SwitchD-ospf-1] quit

1. # 配置SwitchE。

[SwitchE] router id 10.5.5.5
[SwitchE] ospf 1
[SwitchE-ospf-1] area 0
[SwitchE-ospf-1-area-0.0.0.0] network 10.5.5.5 0.0.0.0
[SwitchE-ospf-1-area-0.0.0.0] network 10.0.3.0 0.0.0.255
[SwitchE-ospf-1-area-0.0.0.0] network 192.168.3.0 0.0.0.255
[SwitchE-ospf-1-area-0.0.0.0] quit
[SwitchE-ospf-1] quit

1. 配置PIM-SM
2. # 在所有交换机上使能组播功能，在各接口上使能PIM-SM功能。SwitchB、SwitchC、SwitchD和SwitchE的配置与SwitchA相似，配置过程略。

[SwitchA] multicast routing-enable
[SwitchA] interface vlanif 10
[SwitchA-Vlanif10] pim sm
[SwitchA-Vlanif10] quit
[SwitchA] interface vlanif 20
[SwitchA-Vlanif20] pim sm
[SwitchA-Vlanif20] quit

1. # 在SwitchA连接用户主机的接口上使能IGMP功能。

[SwitchA] interface vlanif 10
[SwitchA-Vlanif10] igmp enable
[SwitchA-Vlanif10] igmp version 3
[SwitchA-Vlanif10] quit

1. # 配置C-BSR和C-RP。在SwitchD上配置RP通告的服务范围，及C-BSR和C-RP的位置。

[SwitchD] pim
[SwitchD-pim] c-bsr vlanif 50
[SwitchD-pim] c-rp vlanif 50
[SwitchD-pim] quit

1. # 通过使用display multicast routing-table命令可以查看交换机组播路由表。以SwitchC为例。

[SwitchC] display multicast routing-table
Multicast routing table of VPN-Instance: public net
 Total 1 entry
 00001. (192.168.3.2, 225.0.0.1)
 Uptime: 15:03:04
 Upstream Interface: Vlanif40
 List of 1 downstream interface
 1: Vlanif30

1. 配置MPLS RSVP-TE隧道
2. # 配置SwitchB。

[SwitchB] mpls lsr-id 10.2.2.2
[SwitchB] mpls
[SwitchB-mpls] mpls te
[SwitchB-mpls] mpls rsvp-te
[SwitchB-mpls] mpls te cspf
[SwitchB-mpls] quit
[SwitchB] interface vlanif 30
[SwitchB-Vlanif30] mpls
[SwitchB-Vlanif30] mpls te
[SwitchB-Vlanif30] mpls rsvp-te
[SwitchB-Vlanif30] quit
[SwitchB] ospf 1
[SwitchB-ospf-1] enable traffic-adjustment
[SwitchB-ospf-1] opaque-capability enable
[SwitchB-ospf-1] area 0.0.0.0
[SwitchB-ospf-1-area-0.0.0.0] mpls-te enable
[SwitchB-ospf-1-area-0.0.0.0] quit
[SwitchB-ospf-1] quit

1. # 配置SwitchC。

[SwitchC] mpls lsr-id 10.3.3.3
[SwitchC] mpls
[SwitchC-mpls] mpls te
[SwitchC-mpls] mpls rsvp-te
[SwitchC-mpls] quit
[SwitchC] interface vlanif 30
[SwitchC-Vlanif30] mpls
[SwitchC-Vlanif30] mpls te
[SwitchC-Vlanif30] mpls rsvp-te
[SwitchC-Vlanif30] quit
[SwitchC] interface vlanif 40
[SwitchC-Vlanif40] mpls
[SwitchC-Vlanif40] mpls te
[SwitchC-Vlanif40] mpls rsvp-te
[SwitchC-Vlanif40] quit
[SwitchC] ospf 1
[SwitchC-ospf-1] opaque-capability enable
[SwitchC-ospf-1] area 0.0.0.0
[SwitchC-ospf-1-area-0.0.0.0] mpls-te enable
[SwitchC-ospf-1-area-0.0.0.0] quit
[SwitchC-ospf-1] quit

1. # 配置SwitchD。

[SwitchD] mpls lsr-id 10.4.4.4
[SwitchD] mpls
[SwitchD-mpls] mpls te
[SwitchD-mpls] mpls rsvp-te
[SwitchD-mpls] quit
[SwitchD] interface vlanif 40
[SwitchD-Vlanif40] mpls
[SwitchD-Vlanif40] mpls te
[SwitchD-Vlanif40] mpls rsvp-te
[SwitchD-Vlanif40] quit
[SwitchD] ospf 1
[SwitchD-ospf-1] opaque-capability enable
[SwitchD-ospf-1] area 0.0.0.0
[SwitchD-ospf-1-area-0.0.0.0] mpls-te enable
[SwitchD-ospf-1-area-0.0.0.0] quit
[SwitchD-ospf-1] quit

1. # 配置MPLS TE隧道，并使能IGP Shortcut。
2. 在SwitchB上配置MPLS TE隧道，使能IGP Shortcut。

[SwitchB] interface tunnel 1
[SwitchB-Tunnel1] ip address unnumbered interface loopback 0
[SwitchB-Tunnel1] tunnel-protocol mpls te
[SwitchB-Tunnel1] destination 10.4.4.4
[SwitchB-Tunnel1] mpls te tunnel-id 100
[SwitchB-Tunnel1] mpls te igp shortcut ospf
[SwitchB-Tunnel1] mpls te igp metric relative -10
[SwitchB-Tunnel1] mpls te commit
[SwitchB-Tunnel1] quit

1. # 查看SwitchB的OSPF路由表，可以看到，MPLS TE隧道已经被建立。

[SwitchB] display ip routing-table
Route Flags: R - relay, D - download to fib 
------------------------------------------------------------------------------
Routing Tables: Public
 Destinations : 15 Routes : 15
Destination/Mask Proto Pre Cost Flags NextHop Interface 
 10.0.0.0/24 Direct 0 0 D 10.0.0.2 Vlanif20
 10.0.0.2/32 Direct 0 0 D 127.0.0.1 Vlanif20
 10.0.1.0/24 Direct 0 0 D 10.0.1.2 Vlanif30
 10.0.1.2/32 Direct 0 0 D 127.0.0.1 Vlanif30
 10.0.2.0/24 OSPF 10 2 D 10.0.1.1 Vlanif30
 10.0.3.0/24 OSPF 10 2 D 10.2.2.2 Tunnel1
 10.1.1.1/32 OSPF 10 1 D 10.0.0.1 Vlanif20 
 10.2.2.2/32 Direct 0 0 D 127.0.0.1 LoopBack0
 10.3.3.3/32 OSPF 10 1 D 10.0.1.1 Vlanif30
 10.4.4.4/32 OSPF 10 1 D 10.2.2.2 Tunnel1
 10.5.5.5/32 OSPF 10 2 D 10.2.2.2 Tunnel1
 127.0.0.0/8 Direct 0 0 D 127.0.0.1 InLoopBack0
 127.0.0.1/32 Direct 0 0 D 127.0.0.1 InLoopBack0
 172.16.1.0/24 OSPF 10 2 D 10.0.0.1 Vlanif20
 192.168.3.0/24 OSPF 10 3 D 10.2.2.2 Tunnel1

1. # 在被TE-Tunnel穿越的交换机SwitchC上查看组播路由表。

[SwitchC] display multicast routing-table

1. 没有显示任何组播表项，说明组播报文被丢弃。
2. 配置本地MT特性
3. # 在SwitchB上使能本地MT特性。

[SwitchB] ospf 1
[SwitchB-ospf-1] local-mt enable
[SwitchB-ospf-1] quit

1. 验证配置结果
2. # 此时再次查看SwitchC的组播路由表，已经有组播路由。

[SwitchC] display multicast routing-table
Multicast routing table of VPN-Instance: public net
 Total 1 entry
 00001. (192.168.3.2, 225.0.0.1)
 Uptime: 00:00:19
 Upstream Interface: Vlanif40
 List of 1 downstream interface
 1: Vlanif30

1. # 在SwitchB上查看MIGP路由表。

[SwitchB] display migp routing-table
Route Flags: R - relay, D - download to fib
------------------------------------------------------------------------------
Routing Tables: MIGP
 Destinations : 4 Routes : 4
Destination/Mask Proto Pre Cost Flags NextHop Interface 
 10.0.3.0/24 OSPF 10 3 10.0.1.1 Vlanif30
 10.4.4.4/32 OSPF 10 2 10.0.1.1 Vlanif30
 10.5.5.5/32 OSPF 10 3 10.0.1.1 Vlanif30
 192.168.3.0/24 OSPF 10 4 10.0.1.1 Vlanif30

1. 原来出接口为TE-Tunnel的路由，其下一跳在MIGP路由表中均被计算为物理出接口。

配置文件

• SwitchA的配置文件

#
sysname SwitchA
#
router id 10.1.1.1
#
vlan batch 10 20
#
multicast routing-enable
#
interface Vlanif10
 ip address 172.16.1.1 255.255.255.0 
 pim sm
 igmp enable
 igmp version 3
#
interface Vlanif20
 ip address 10.0.0.1 255.255.255.0
 pim sm
#
interface GigabitEthernet1/0/1
 port link-type access
 port default vlan 10 
#
interface GigabitEthernet1/0/2
 port link-type trunk
 port trunk allow-pass vlan 20 
#
interface LoopBack0
 ip address 10.1.1.1 255.255.255.255
#
ospf 1
 area 0.0.0.0
 network 10.1.1.1 0.0.0.0
 network 10.0.0.0 0.0.0.255
 network 172.16.1.0 0.0.0.255
#
return

• SwitchB的配置文件

#
sysname SwitchB
#
router id 10.2.2.2
#
vlan batch 20 30
#
multicast routing-enable
#
mpls lsr-id 10.2.2.2
mpls
 mpls te
 mpls rsvp-te
 mpls te cspf
#
interface Vlanif20
 ip address 10.0.0.2 255.255.255.0
 pim sm
#
interface Vlanif30
 ip address 10.0.1.2 255.255.255.0
 pim sm
 mpls
 mpls te
 mpls rsvp-te
#
interface GigabitEthernet1/0/1
 port link-type trunk
 port trunk allow-pass vlan 20
#
interface GigabitEthernet1/0/2
 port link-type trunk
 port trunk allow-pass vlan 30
#
interface LoopBack0
 ip address 10.2.2.2 255.255.255.255
#
interface Tunnel1
 ip address unnumbered interface LoopBack0
 tunnel-protocol mpls te
 destination 10.4.4.4
 mpls te tunnel-id 100
 mpls te igp shortcut ospf
 mpls te igp metric relative -10
 mpls te commit
#
ospf 1
 opaque-capability enable
 enable traffic-adjustment
 local-mt enable
 area 0.0.0.0
 network 10.2.2.2 0.0.0.0
 network 10.0.0.0 0.0.0.255
 network 10.0.1.0 0.0.0.255
 mpls-te enable
#
return

• SwitchC的配置文件

#
sysname SwitchC
#
router id 10.3.3.3
#
vlan batch 30 40
#
multicast routing-enable
#
mpls lsr-id 10.3.3.3
mpls
 mpls te
 mpls rsvp-te
#
interface Vlanif30
 ip address 10.0.1.1 255.255.255.0
 pim sm
 mpls
 mpls te
 mpls rsvp-te
#
interface Vlanif40
 ip address 10.0.2.2 255.255.255.0
 pim sm
 mpls
 mpls te
 mpls rsvp-te
#
interface GigabitEthernet1/0/1
 port link-type trunk
 port trunk allow-pass vlan 30
#
interface GigabitEthernet1/0/2
 port link-type trunk
 port trunk allow-pass vlan 40
#
interface LoopBack0
 ip address 10.3.3.3 255.255.255.255
#
ospf 1
 opaque-capability enable
 area 0.0.0.0
 network 10.3.3.3 0.0.0.0
 network 10.0.1.0 0.0.0.255
 network 10.0.2.0 0.0.0.255
 mpls-te enable
#
return

• SwitchD的配置文件

#
sysname SwitchD
#
router id 10.4.4.4
#
vlan batch 40 50
#
multicast routing-enable
#
mpls lsr-id 10.4.4.4
mpls
 mpls te
 mpls rsvp-te
#
interface Vlanif40
 ip address 10.0.2.1 255.255.255.0
 pim sm
 mpls
 mpls te
 mpls rsvp-te
#
interface Vlanif50
 ip address 10.0.3.1 255.255.255.0
 pim sm
#
interface GigabitEthernet1/0/1
 port link-type trunk
 port trunk allow-pass vlan 50
#
interface GigabitEthernet1/0/2
 port link-type trunk
 port trunk allow-pass vlan 40
#
interface LoopBack0
 ip address 10.4.4.4 255.255.255.255
#
ospf 1
 opaque-capability enable
 area 0.0.0.0
 network 10.4.4.4 0.0.0.0
 network 10.0.2.0 0.0.0.255
 network 10.0.3.0 0.0.0.255
 mpls-te enable
#
pim
 c-bsr Vlanif50
 c-rp Vlanif50
#
return

• SwitchE的配置文件

#
sysname SwitchE
#
router id 10.5.5.5
#
vlan batch 50 60
#
multicast routing-enable
#
interface Vlanif50
 ip address 10.0.3.3 255.255.255.0
 pim sm
#
interface Vlanif60
 ip address 192.168.3.1 255.255.255.0
 pim sm
#
interface GigabitEthernet1/0/1
 port link-type trunk
 port trunk allow-pass vlan 50
#
interface GigabitEthernet1/0/2
 port link-type access
 port default vlan 60
#
interface LoopBack0
 ip address 10.5.5.5 255.255.255.255
#
ospf 1
 area 0.0.0.0
 network 10.5.5.5 0.0.0.0
 network 10.0.3.0 0.0.0.255
 network 192.168.3.0 0.0.0.255
#
return