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配置OptionC方式跨域BGP AD VPLS示例
ASBR上无需创建和维护VPLS。当每个AS都有大量的跨域VPLS时，可选择这种方案，防止ASBR成为阻碍网络进一步扩展的瓶颈。
组网需求
如图10-32，CE1和CE2属于同一个VPLS，分别通过AS100内的PE1和AS200内的PE2接入骨干网。
当每个AS内有大量的跨域VPLS时，可以配置采用OptionC方式跨域BGP AD VPLS。在OptionC方式跨域BGP AD VPLS中，ASBR上不再维护VPLS标签块信息，而是PE之间直接交换VPLS标签块信息。
配置思路
采用如下的思路配置OptionC方式跨域BGP AD VPLS：
在骨干网上运行IGP协议，使同一个AS域内的各设备能互通。
在骨干网上使能MPLS，在PE与ASBR之间建立动态LSP隧道，并且在ASBR之间的接口上也要使能MPLS。
同一AS的PE和ASBR之间建立IBGP。
在各ASBR之间配置EBGP，在ASBR上需配置路由策略，使能标签路由功能。在PE1和PE2之间建立MP-EBGP对等体关系。
在PE1和PE2之间创建VSI实例，接入CE。
数据准备
为完成此配置例，需准备如下的数据：
PE及ASBR上的MPLS LSR-ID。
PE上创建的VSI实例名、路由标识RD及收发路由属性VPN-Target。
PE上绑定VSI实例的AC接口。
ASBR上使用的路由策略。
操作步骤
- 配置各设备接口的IP地址
# 配置CE1。
<HUAWEI> system-view[~HUAWEI] sysname CE1
[*HUAWEI] commit
[~CE1] interface gigabitethernet 1/0/0.1
[*CE1-GigabitEthernet1/0/0.1] ip address 10.1.1.1 24
[*CE1-GigabitEthernet1/0/0.1] quit
[*CE1] commit# 配置PE1。
<HUAWEI> system-view[~HUAWEI] sysname PE1
[*HUAWEI] commit
[~PE1] interface loopback1[*PE1-Loopback1] ip address 1.1.1.1 32[*PE1-Loopback1] quit[*PE1] interface gigabitethernet 2/0/0
[*PE1-GigabitEthernet2/0/0] ip address 10.10.1.1 24
[*PE1-GigabitEthernet2/0/0] quit
[*PE1] commit# 配置ASBR1。
<HUAWEI> system-view[~HUAWEI] sysname ASBR1
[*HUAWEI] commit
[~ASBR1] interface loopback1[*ASBR1-Loopback1] ip address 2.2.2.2 32[*ASBR1-Loopback1] quit[*ASBR1] interface gigabitethernet 1/0/0
[*ASBR1-GigabitEthernet1/0/0] ip address 10.10.1.2 24
[*ASBR1-GigabitEthernet1/0/0] quit
[*ASBR1] interface gigabitethernet 2/0/0
[*ASBR1-GigabitEthernet2/0/0] ip address 10.20.1.1 24
[*ASBR1-GigabitEthernet2/0/0] quit
[*ASBR1] commit# 配置ASBR2。
<HUAWEI> system-view[~HUAWEI] sysname ASBR2
[*HUAWEI] commit
[~ASBR2] interface loopback1[*ASBR2-Loopback1] ip address 3.3.3.3 32[*ASBR2-Loopback1] quit[*ASBR2] interface gigabitethernet 1/0/0
[*ASBR2-GigabitEthernet1/0/0] ip address 10.20.1.2 24
[*ASBR2-GigabitEthernet1/0/0] quit
[*ASBR2] interface gigabitethernet 2/0/0
[*ASBR2-GigabitEthernet2/0/0] ip address 10.30.1.1 24
[*ASBR2-GigabitEthernet2/0/0] quit
[*ASBR2] commit# 配置PE2。
<HUAWEI> system-view[~HUAWEI] sysname PE2
[*HUAWEI] commit
[~PE2] interface loopback1[*PE2-Loopback1] ip address 4.4.4.4 32[*PE2-Loopback1] quit[*PE2] interface gigabitethernet 1/0/0
[*PE2-GigabitEthernet1/0/0] ip address 10.30.1.1 24
[*PE2-GigabitEthernet1/0/0] quit
[*PE2] commit# 配置CE2。
<HUAWEI> system-view[~HUAWEI] sysname CE2
[*HUAWEI] commit
[*CE2] interface gigabitethernet 1/0/0.1
[*CE2-GigabitEthernet1/0/0.1] ip address 10.1.1.2 24
[*CE2-GigabitEthernet1/0/0.1] quit
[*CE2] commit - 配置骨干网的IGP协议
# 配置PE1。
[~PE1] ospf 1[*PE1-ospf-1] area 0.0.0.0[*PE1-ospf-1-area-0.0.0.0] network 1.1.1.1 0.0.0.0[*PE1-ospf-1-area-0.0.0.0] network 10.10.1.0 0.0.0.255[*PE1-ospf-1-area-0.0.0.0] quit[*PE1-ospf-1] quit[*PE1] commit# 配置ASBR1。
[~ASBR1] ospf 1[*ASBR1-ospf-1] area 0.0.0.0[*ASBR1-ospf-1-area-0.0.0.0] network 2.2.2.2 0.0.0.0[*ASBR1-ospf-1-area-0.0.0.0] network 10.10.1.0 0.0.0.255[*ASBR1-ospf-1-area-0.0.0.0] quit[*ASBR1-ospf-1] quit[*ASBR1] commit# 配置ASBR2。
[*ASBR2] ospf 1[*ASBR2-ospf-1] area 0.0.0.0[*ASBR2-ospf-1-area-0.0.0.0] network 3.3.3.3 0.0.0.0[*ASBR2-ospf-1-area-0.0.0.0] network 10.30.1.0 0.0.0.255[*ASBR2-ospf-1-area-0.0.0.0] quit[*ASBR2-ospf-1] quit[*ASBR2] commit# 配置PE2。
[~PE2] ospf 1[*PE2-ospf-1] area 0.0.0.0[*PE2-ospf-1-area-0.0.0.0] network 4.4.4.4 0.0.0.0[*PE2-ospf-1-area-0.0.0.0] network 10.30.1.0 0.0.0.255[*PE2-ospf-1-area-0.0.0.0] quit[*PE2-ospf-1] quit[*PE2] commit - 使能MPLS，建立LSP隧道
# 配置PE1。
[~PE1] mpls lsr-id 1.1.1.1[*PE1] mpls[*PE1-mpls] quit[*PE1] mpls ldp[*PE1-mpls-ldp] quit[*PE1] inerface gigabitethernet 2/0/0
[*PE1-GigabitEthernet2/0/0] mpls
[*PE1-GigabitEthernet2/0/0] mpls ldp
[*PE1-GigabitEthernet2/0/0] quit
[*PE1] commit# 配置ASBR1。
[*ASBR1] mpls lsr-id 2.2.2.2[*ASBR1] mpls[*ASBR1-mpls] quit[*ASBR1] mpls ldp[*ASBR1-mpls-ldp] quit[*ASBR1] inerface gigabitethernet 1/0/0
[*ASBR1-GigabitEthernet1/0/0] mpls
[*ASBR1-GigabitEthernet1/0/0] mpls ldp
[*ASBR1-GigabitEthernet1/0/0] quit
[*ASBR1] commit# 配置ASBR2。
[~ASBR2] mpls lsr-id 3.3.3.3[*ASBR2] mpls[*ASBR2-mpls] quit[*ASBR2] mpls ldp[*ASBR2-mpls-ldp] quit[*ASBR2] inerface gigabitethernet 2/0/0
[*ASBR2-GigabitEthernet2/0/0] mpls
[*ASBR2-GigabitEthernet2/0/0] mpls ldp
[*ASBR2-GigabitEthernet2/0/0] quit
[*ASBR2] commit# 配置PE2。
[~PE2] mpls lsr-id 4.4.4.4[*PE2] mpls[*PE2-mpls] quit[*PE2] mpls ldp[*PE2-mpls-ldp] quit[*PE2] inerface gigabitethernet 1/0/0
[*PE2-GigabitEthernet1/0/0] mpls
[*PE2-GigabitEthernet1/0/0] mpls ldp
[*PE2-GigabitEthernet1/0/0] quit
[*PE2] commit - 在ASBR上使能域间的MPLS功能
# 配置ASBR1。
[~ASBR1] inerface gigabitethernet 2/0/0
[*ASBR1-GigabitEthernet2/0/0] mpls
[*ASBR1-GigabitEthernet2/0/0-mpls] quit
[*ASBR1] commit# 配置ASBR2。
[~ASBR2] inerface gigabitethernet 1/0/0
[*ASBR2-GigabitEthernet1/0/0] mpls
[*ASBR2-GigabitEthernet1/0/0-mpls] quit
[*ASBR2] commit - 在PE1与ASBR1之间、PE2与ASBR2之间配置IBGP对等体，在ASBR1与ASBR2之间配置EBGP对等体，并在ASBR上配置路由策略，对于从本AS的PE接收的路由，在向对端ASBR发布时，分配MPLS标签。对于向本AS的PE发布的路由，如果是带标签的IPv4路由，为其重新分配MPLS标签。
# 配置PE1。
[~PE1] bgp 100[*PE1-bgp] peer 2.2.2.2 as-number 100[*PE1-bgp] peer 2.2.2.2 label-route-capability[*PE1-bgp] peer 2.2.2.2 connect-interface LoopBack 1[*PE1-bgp] quit[*PE1] commit# 配置ASBR1。
[*ASBR1] route-policy policy1 permit node 1[*ASBR1-route-policy] if-match mpls-label[*ASBR1-route-policy] apply mpls-label[*ASBR1-route-policy] quit[*ASBR1] route-policy policy2 permit node 1[*ASBR1-route-policy] apply mpls-label[*ASBR1-route-policy] quit[*ASBR1] bgp 100[*ASBR1-bgp] network 1.1.1.1 255.255.255.255[*ASBR1-bgp] peer 1.1.1.1 as-number 100[*ASBR1-bgp] peer 1.1.1.1 route-policy policy1 export[*ASBR1-bgp] peer 1.1.1.1 label-route-capability[*ASBR1-bgp] peer 1.1.1.1 connect-interface loopback 1[*ASBR1-bgp] peer 10.20.1.2 as-number 200[*ASBR1-bgp] peer 10.20.1.2 route-policy policy2 export[*ASBR1-bgp] peer 10.20.1.2 label-route-capability[*ASBR1-bgp] peer 10.20.1.2 connect-interface gigabitethernet 2/0/0
[*ASBR1-bgp]quit[*ASBR1]commit# 配置ASBR2。
[*ASBR2] route-policy policy1 permit node 1[*ASBR2-route-policy] if-match mpls-label[*ASBR2-route-policy] apply mpls-label[*ASBR2-route-policy] quit[*ASBR2] route-policy policy2 permit node 1[*ASBR2-route-policy] apply mpls-label[*ASBR2-route-policy] quit[*ASBR2] bgp 200[*ASBR2-bgp] network 4.4.4.4 255.255.255.255[*ASBR2-bgp] peer 4.4.4.4 as-number 200[*ASBR2-bgp] peer 4.4.4.4 route-policy policy1 export[*ASBR2-bgp] peer 4.4.4.4 label-route-capability[*ASBR2-bgp] peer 4.4.4.4 connect-interface loopback 1[*ASBR2-bgp] peer 10.20.1.1 as-number 100[*ASBR2-bgp] peer 10.20.1.1 route-policy policy2 export[*ASBR2-bgp] peer 10.20.1.1 label-route-capability[*ASBR2-bgp] peer 10.20.1.1 connect-interface gigabitethernet 1/0/0
[*ASBR2-bgp] quit[*ASBR2] commit# 配置PE2。
[~PE2] bgp 200[*PE2-bgp] peer 3.3.3.3 as-number 200[*PE2-bgp] peer 3.3.3.3 label-route-capability[*PE2-bgp] peer 3.3.3.3 connect-interface loopback 1[*PE2-bgp] quit[*PE2] commit在ASBR上执行display tunnel-info all命令，可发现创建了“mpls local ifnet”类型的隧道。以ASBR1的显示为例：
[~ASBR1] display tunnel-info allTunnel ID Type Destination Status ----------------------------------------------------------------------------- 0x0000000001004c6b42 ldp 1.1.1.1 UP 0x000000000c00030000 mpls local ifnet 10.20.1.2 UP
在PE上执行display tunnel-info all命令，可发现跨域隧道建立成功。以PE1的显示为例：
[~PE1] display tunnel-info allTunnel ID Type Destination Status ----------------------------------------------------------------------------- 0x0000000001004c6b42 ldp 2.2.2.2 UP 0x000000000201040000 bgp 4.4.4.4 UP
- PE1和PE2之间建立MP-EBGP对等体
# 配置PE1。
[~PE1] bgp 100[*PE1-bgp] peer 4.4.4.4 as-number 200[*PE1-bgp] peer 4.4.4.4 ebgp-max-hop 255[*PE1-bgp] peer 4.4.4.4 connect-interface loopback 1[*PE1-bgp] l2vpn-ad-family[*PE1-bgp-af-l2vpn-ad] peer 4.4.4.4 enable[*PE1-bgp-af-l2vpn-ad] quit[*PE1-bgp] quit[*PE1] commit# 配置PE2。
[~PE2] bgp 200[*PE2-bgp] peer 1.1.1.1 as-number 100[*PE2-bgp] peer 1.1.1.1 ebgp-max-hop 255[*PE2-bgp] peer 1.1.1.1 connect-interface loopback 1[*PE2-bgp] l2vpn-ad-family[*PE2-bgp-af-l2vpn-ad] peer 1.1.1.1 enable[*PE2-bgp-af-l2vpn-ad] quit[*PE2-bgp] quit[*PE2] commit完成此步配置，在PE上执行display bgp l2vpn-ad peer命令，可发现PE1与PE2之间的MP-EBGP对等体状态为“Established”。以PE1的显示为例：
[~PE1] display bgp l2vpn-ad peerBGP local router ID : 10.10.1.1 Local AS number : 100 Total number of peers : 1 Peers in established state : 1 Peer V AS MsgRcvd MsgSent OutQ Up/Down State PrefRcv 4.4.4.4 4 200 5 6 0 00:00:41 Established 0
- PE上配置VSI实例，接入CE
# 配置PE1。
[~PE1] mpls l2vpn[*PE1] quit[*PE1] vsi vplsad1[*PE1-vsi-vplsad1] bgp-ad[*PE1-vsi-vplsad1-bgpad] vpls-id 100:1[*PE1-vsi-vplsad1-bgpad] vpn-target 200:1 import-extcommunity[*PE1-vsi-vplsad1-bgpad] vpn-target 200:1 export-extcommunity[*PE1-vsi-vplsad1-bgpad] quit[*PE1-vsi-vplsad1] quit[*PE1] interface gigabitethernet1/0/0.1
[*PE1-GigabitEthernet1/0/0.1] vlan-type dot1q 10
[*PE1-GigabitEthernet1/0/0.1] l2 binding vsi vplsad1
[*PE1-GigabitEthernet1/0/0.1] quit
[*PE1] commit# 配置PE2。
[*PE2] mpls l2vpn[*PE2] quit[*PE2] vsi vplsad1[*PE2-vsi-vplsad1] bgp-ad[*PE2-vsi-vplsad1-bgpad] vpls-id 100:1[*PE2-vsi-vplsad1-bgpad] vpn-target 200:1 import-extcommunity[*PE2-vsi-vplsad1-bgpad] vpn-target 200:1 export-extcommunity[*PE2-vsi-vplsad1-bgpad] quit[*PE2-vsi-vplsad1] quit[~PE2] interface gigabitethernet2/0/0.1
[*PE2-GigabitEthernet2/0/0.1] vlan-type dot1q 10
[*PE2-GigabitEthernet2/0/0.1] l2 binding vsi vplsad1
[*PE2-GigabitEthernet2/0/0.1] quit
[*PE2] commit# 配置CE1。
[~CE1] interface gigabitethernet1/0/0.1
[*CE1-GigabitEthernet1/0/0.1] vlan-type dot1q 10
[*CE1-GigabitEthernet1/0/0.1] quit
[*CE1] commit# 配置CE2。
[~CE2] interface gigabitethernet1/0/0.1
[*CE2-GigabitEthernet1/0/0.1] vlan-type dot1q 10
[*CE2-GigabitEthernet1/0/0.1] quit
[*CE2] commit完成此步骤后，在PE上查看VSI信息，可以看到VSI状态为up。到远端PE的PW状态也为Up。以PE1显示为例：[~PE1] display vsiTotal VSI number is 1, 1 is up, 0 is down, 0 is LDP mode, 0 is BGP mode, 1 is BGPAD mode, 0 is mixed mode, 0 is unspecified mode -------------------------------------------------------------------------- Vsi Mem PW Mac Encap Mtu Vsi Name Disc Type Learn Type Value State -------------------------------------------------------------------------- vplsad1 -- bgpad unqualify vlan 1500 up
- 验证配置结果
完成上述配置后，CE1与CE2可以相互ping通。以CE1的显示为例：
[~CE1] ping 10.1.1.2PING 10.1.1.2: 56 data bytes, press CTRL_C to break Reply from 10.1.1.2: bytes=56 Sequence=1 ttl=255 time=19 ms Reply from 10.1.1.2: bytes=56 Sequence=2 ttl=255 time=3 ms Reply from 10.1.1.2: bytes=56 Sequence=3 ttl=255 time=4 ms Reply from 10.1.1.2: bytes=56 Sequence=4 ttl=255 time=3 ms Reply from 10.1.1.2: bytes=56 Sequence=5 ttl=255 time=3 ms --- 10.1.1.2 ping statistics --- 5 packet(s) transmitted 5 packet(s) received 0.00% packet loss round-trip min/avg/max = 3/6/19 ms
配置文件
CE1的配置文件
# sysname CE1 # interface GigabitEthernet1/0/0 undo shutdown # interface GigabitEthernet1/0/0.1 undo shutdown vlan-type dot1q 10 ip address 10.1.1.1 255.255.255.0 # return
PE1的配置文件
# sysname PE1 # mpls lsr-id 1.1.1.1 # mpls # mpls l2vpn # vsi vplsad1 bgp-ad vpls-id 100:1 vpn-target 200:1 import-extcommunity vpn-target 200:1 export-extcommunity # mpls ldp # interface GigabitEthernet1/0/0 undo shutdown # interface GigabitEthernet1/0/0.1 vlan-type dot1q 10 l2 binding vsi vplsad1 # interface GigabitEthernet2/0/0 undo shutdown ip address 10.10.1.1 255.255.255.0 mpls mpls ldp # interface LoopBack1 ip address 1.1.1.1 255.255.255.255 # bgp 100 peer 2.2.2.2 as-number 100 peer 2.2.2.2 connect-interface LoopBack1 peer 4.4.4.4 as-number 200 peer 4.4.4.4 ebgp-max-hop 255 peer 4.4.4.4 connect-interface LoopBack1 # ipv4-family unicast undo synchronization peer 2.2.2.2 enable peer 2.2.2.2 label-route-capability peer 4.4.4.4 enable # l2vpn-ad-family policy vpn-target peer 4.4.4.4 enable # ospf 1 area 0.0.0.0 network 1.1.1.1 0.0.0.0 network 10.10.1.0 0.0.0.255 # return
ASBR1的配置文件
# sysname ASBR1 # mpls lsr-id 2.2.2.2 # mpls # mpls ldp # interface GigabitEthernet2/0/0 undo shutdown ip address 10.20.1.1 255.255.255.0 mpls # interface GigabitEthernet1/0/0 undo shutdown ip address 10.10.1.2 255.255.255.0 mpls mpls ldp # interface LoopBack1 ip address 2.2.2.2 255.255.255.255 # bgp 100 peer 1.1.1.1 as-number 100 peer 1.1.1.1 connect-interface LoopBack1 peer 10.20.1.2 as-number 200 peer 10.20.1.2 connect-interface GigabitEthernet2/0/0 # ipv4-family unicast undo synchronization network 1.1.1.1 255.255.255.255 peer 1.1.1.1 enable peer 1.1.1.1 route-policy policy1 export peer 1.1.1.1 label-route-capability peer 10.20.1.2 enable peer 10.20.1.2 route-policy policy2 export peer 10.20.1.2 label-route-capability # ospf 1 area 0.0.0.0 network 2.2.2.2 0.0.0.0 network 10.10.1.0 0.0.0.255 # route-policy policy1 permit node 1 if-match mpls-label apply mpls-label # route-policy policy2 permit node 1 apply mpls-label # return
ASBR2的配置文件
# sysname ASBR2 # mpls lsr-id 3.3.3.3 # mpls # mpls ldp # interface GigabitEthernet2/0/0 undo shutdown ip address 10.30.1.1 255.255.255.0 mpls mpls ldp # interface GigabitEthernet1/0/0 undo shutdown ip address 10.20.1.2 255.255.255.0 mpls # interface LoopBack1 ip address 3.3.3.3 255.255.255.255 # bgp 200 peer 4.4.4.4 as-number 200 peer 10.20.1.1 as-number 100 peer 10.20.1.1 connect-interface GigabitEthernet1/0/0 # ipv4-family unicast undo synchronization network 4.4.4.4 255.255.255.255 peer 4.4.4.4 enable peer 4.4.4.4 route-policy policy1 export peer 4.4.4.4 label-route-capability peer 10.20.1.1 enable peer 10.20.1.1 route-policy policy2 export peer 10.20.1.1 label-route-capability # ospf 1 area 0.0.0.0 network 3.3.3.3 0.0.0.0 network 10.30.1.0 0.0.0.255 # route-policy policy1 permit node 1 if-match mpls-label apply mpls-label # route-policy policy2 permit node 1 apply mpls-label # return
PE2的配置文件
# sysname PE2 # mpls lsr-id 4.4.4.4 # mpls # mpls l2vpn # vsi vplsad1 bgp-ad vpls-id 100:1 vpn-target 200:1 import-extcommunity vpn-target 200:1 export-extcommunity # mpls ldp # interface GigabitEthernet1/0/0 undo shutdown ip address 10.30.1.2 255.255.255.0 mpls mpls ldp # interface GigabitEthernet2/0/0 undo shutdown # interface GigabitEthernet2/0/0.1 vlan-type dot1q 10 l2 binding vsi vplsad1 # interface LoopBack1 ip address 4.4.4.4 255.255.255.255 # bgp 200 peer 1.1.1.1 as-number 100 peer 1.1.1.1 ebgp-max-hop 255 peer 1.1.1.1 connect-interface LoopBack1 peer 3.3.3.3 as-number 200 peer 3.3.3.3 connect-interface LoopBack1 # ipv4-family unicast undo synchronization peer 1.1.1.1 enable peer 3.3.3.3 enable peer 3.3.3.3 label-route-capability # l2vpn-ad-family policy vpn-target peer 1.1.1.1 enable # ospf 1 area 0.0.0.0 network 4.4.4.4 0.0.0.0 network 10.30.1.0 0.0.0.255 # return
CE2的配置文件
# sysname CE2 # interface GigabitEthernet1/0/0 undo shutdown # interface GigabitEthernet1/0/0.1 undo shutdown vlan-type dot1q 10 ip address 10.1.1.2 255.255.255.0 # return
