华为运营商级路由器配置示例 | EVdPdNd VPWS over SRv6 BE（CE双归单活）
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组网需求
如图1所示，CE2同时双归接入到PE2和PE3。要求CE1发往CE2的流量采用主备备份方式进行传输。
为了实现上述需求，可以基于ESI粒度设置冗余模式，即，配置CE2接入PE的冗余模式为单活跃模式。
图1 配置EVPN VPWS over SRv6 BE（CE双归单活）组网图
配置思路
- 使能PE各接口的IPv6转发能力，配置各接口的IPv6地址。
- 在各PE上使能IS-IS，配置Level级别，指定网络实体。
- 在PE设备上配置EVPN VPWS实例、EVPL实例。
- 在PE设备之间建立BGP EVPN对等体关系。
- 在PE设备上配置SRv6 BE。
- 在PE设备上配置将相应的EVPL实例绑定到接入侧子接口。
- 在PE上配置基于ESI粒度设置冗余模式。
- 配置CE接入PE。
操作步骤
1.使能各接口的IPv6转发能力，配置IPv6地址
<HUAWEI> system-view
[~HUAWEI] sysname PE1
[*HUAWEI] commit
[~PE1] interface gigabitethernet 1/0/0
[~PE1-GigabitEthernet1/0/0] ipv6 enable
[*PE1-GigabitEthernet1/0/0] ipv6 address 2001:DB8:10::1 64
[*PE1-GigabitEthernet1/0/0] quit
[*PE1] interface gigabitethernet 2/0/0
[*PE1-GigabitEthernet2/0/0] ipv6 enable
[*PE1-GigabitEthernet2/0/0] ipv6 address 2001:DB8:20::1 64
[*PE1-GigabitEthernet2/0/0] quit
[*PE1] interface LoopBack 1
[*PE1-LoopBack1] ip address 1.1.1.1 32
[*PE1-LoopBack1] ipv6 enable
[*PE1-LoopBack1] ipv6 address 2001:DB8:1::1 128
[*PE1-LoopBack1] quit
[*PE1] commit由于需要为EVPN源地址准备IPv4地址，因此这里Loopback接口还需配置IPv4地址。这里以PE1为例，其他设备的配置过程相同，详情可参考配置文件。
2.配置IS-IS
# 配置PE1。
[~PE1] isis 1
[*PE1-isis-1] is-level level-1
[*PE1-isis-1] cost-style wide
[*PE1-isis-1] network-entity 10.0000.0000.0001.00
[*PE1-isis-1] ipv6 enable topology ipv6
[*PE1-isis-1] quit
[*PE1] interface gigabitethernet 1/0/0
[*PE1-GigabitEthernet1/0/0] isis ipv6 enable 1
[*PE1-GigabitEthernet1/0/0] quit
[*PE1] interface gigabitethernet 2/0/0
[*PE1-GigabitEthernet2/0/0] isis ipv6 enable 1
[*PE1-GigabitEthernet2/0/0] quit
[*PE1] interface loopback1
[*PE1-LoopBack1] isis ipv6 enable 1
[*PE1-LoopBack1] commit
[~PE1-LoopBack1] quit# 配置PE2。
[~PE2] isis 1
[*PE2-isis-1] is-level level-1
[*PE2-isis-1] cost-style wide
[*PE2-isis-1] network-entity 10.0000.0000.0002.00
[*PE2-isis-1] ipv6 enable topology ipv6
[*PE2-isis-1] quit
[*PE2] interface gigabitethernet 1/0/0
[*PE2-GigabitEthernet1/0/0] isis ipv6 enable 1
[*PE2-GigabitEthernet1/0/0] quit
[*PE2] interface gigabitethernet 2/0/0
[*PE2-GigabitEthernet2/0/0] isis ipv6 enable 1
[*PE2-GigabitEthernet2/0/0] quit
[*PE2] interface loopback1
[*PE2-LoopBack1] isis ipv6 enable 1
[*PE2-LoopBack1] commit
[~PE2-LoopBack1] quit# 配置PE3。
[~PE3] isis 1
[*PE3-isis-1] is-level level-1
[*PE3-isis-1] cost-style wide
[*PE3-isis-1] network-entity 10.0000.0000.0003.00
[*PE3-isis-1] ipv6 enable topology ipv6
[*PE3-isis-1] quit
[*PE3] interface gigabitethernet 1/0/0
[*PE3-GigabitEthernet1/0/0] isis ipv6 enable 1
[*PE3-GigabitEthernet1/0/0] quit
[*PE3] interface gigabitethernet 2/0/0
[*PE3-GigabitEthernet2/0/0] isis ipv6 enable 1
[*PE3-GigabitEthernet2/0/0] quit
[*PE3] interface loopback1
[*PE3-LoopBack1] isis ipv6 enable 1
[*PE3-LoopBack1] commit
[~PE3-LoopBack1] quit配置完成后，可以执行display isis peer和display isis route命令检查IS-IS是否配置成功。以PE1为例：
[~PE1] display isis peer
Peer information for ISIS(1)
System Id Interface Circuit Id State HoldTime Type PRI
--------------------------------------------------------------------------------
0000.0000.0003* GE2/0/0 0000.0000.0003.02 Up 8s L1 64
0000.0000.0002* GE1/0/0 0000.0000.0002.02 Up 6s L1 64
Total Peer(s): 2 3.在PE设备上配置EVPN VPWS实例、EVPL实例
# 配置PE1。
[~PE1] evpn source-address 1.1.1.1
[*PE1] evpn vpn-instance evrf1 vpws
[*PE1-vpws-evpn-instance-evrf1] route-distinguisher 100:1
[*PE1-vpws-evpn-instance-evrf1] vpn-target 1:1
[*PE1-vpws-evpn-instance-evrf1] quit
[*PE1] evpl instance 1
[*PE1-evpl1] evpn binding vpn-instance evrf1
[*PE1-evpl1] local-service-id 100 remote-service-id 200
[*PE1-evpl1] quit
[*PE1] commit# 配置PE2。
[~PE2] evpn source-address 2.2.2.2
[*PE2] evpn vpn-instance evrf1 vpws
[*PE2-vpws-evpn-instance-evrf1] route-distinguisher 200:1
[*PE2-vpws-evpn-instance-evrf1] vpn-target 1:1
[*PE2-vpws-evpn-instance-evrf1] quit
[*PE2] evpl instance 1
[*PE2-evpl1] evpn binding vpn-instance evrf1
[*PE2-evpl1] local-service-id 200 remote-service-id 100
[*PE2-evpl1] quit
[*PE2] commit# 配置PE3。
[~PE3] evpn source-address 3.3.3.3
[*PE3] evpn vpn-instance evrf1 vpws
[*PE3-vpws-evpn-instance-evrf1] route-distinguisher 300:1
[*PE3-vpws-evpn-instance-evrf1] vpn-target 1:1
[*PE3-vpws-evpn-instance-evrf1] quit
[*PE3] evpl instance 1
[*PE3-evpl1] evpn binding vpn-instance evrf1
[*PE3-evpl1] local-service-id 200 remote-service-id 100
[*PE3-evpl1] quit
[*PE3] commit4.在PE设备之间建立BGP EVPN对等体关系
# 配置PE1。
[~PE1] bgp 100
[*PE1-bgp] router-id 1.1.1.1
[*PE1-bgp] peer 2001:DB8:3::3 as-number 100
[*PE1-bgp] peer 2001:DB8:3::3 connect-interface loopback 1
[*PE1-bgp] peer 2001:DB8:2::2 as-number 100
[*PE1-bgp] peer 2001:DB8:2::2 connect-interface loopback 1
[*PE1-bgp] l2vpn-family evpn
[*PE1-bgp-af-evpn] peer 2001:DB8:3::3 enable
[*PE1-bgp-af-evpn] peer 2001:DB8:3::3 advertise encap-type srv6
[*PE1-bgp-af-evpn] peer 2001:DB8:2::2 enable
[*PE1-bgp-af-evpn] peer 2001:DB8:2::2 advertise encap-type srv6
[*PE1-bgp-af-evpn] quit
[*PE1-bgp] quit
[*PE1] commit# 配置PE2。
[~PE2] bgp 100
[*PE2-bgp] router-id 2.2.2.2
[*PE2-bgp] peer 2001:DB8:1::1 as-number 100
[*PE2-bgp] peer 2001:DB8:1::1 connect-interface loopback 1
[*PE2-bgp] peer 2001:DB8:3::3 as-number 100
[*PE2-bgp] peer 2001:DB8:3::3 connect-interface loopback 1
[*PE2-bgp] l2vpn-family evpn
[*PE2-bgp-af-evpn] peer 2001:DB8:1::1 enable
[*PE2-bgp-af-evpn] peer 2001:DB8:1::1 advertise encap-type srv6
[*PE2-bgp-af-evpn] peer 2001:DB8:3::3 enable
[*PE2-bgp-af-evpn] peer 2001:DB8:3::3 advertise encap-type srv6
[*PE2-bgp-af-evpn] quit
[*PE2-bgp] quit
[*PE2] commit# 配置PE3。
[~PE3] bgp 100
[*PE3-bgp] router-id 3.3.3.3
[*PE3-bgp] peer 2001:DB8:1::1 as-number 100
[*PE3-bgp] peer 2001:DB8:1::1 connect-interface loopback 1
[*PE3-bgp] peer 2001:DB8:2::2 as-number 100
[*PE3-bgp] peer 2001:DB8:2::2 connect-interface loopback 1
[*PE3-bgp] l2vpn-family evpn
[*PE3-bgp-af-evpn] peer 2001:DB8:1::1 enable
[*PE3-bgp-af-evpn] peer 2001:DB8:1::1 advertise encap-type srv6
[*PE3-bgp-af-evpn] peer 2001:DB8:2::2 enable
[*PE3-bgp-af-evpn] peer 2001:DB8:2::2 advertise encap-type srv6
[*PE3-bgp-af-evpn] quit
[*PE3-bgp] quit
[*PE3] commit配置完成后，在PE设备上执行display bgp evpn peer命令，可以看到PE之间的BGP EVPN对等体关系已建立，并达到Established状态。
以PE1的显示为例：
[~PE1] display bgp evpn peer
BGP local router ID : 1.1.1.1
Local AS number : 100
Total number of peers : 2 Peers in established state : 2
Peer V AS MsgRcvd MsgSent OutQ Up/Down State PrefRcv
2001:DB8:2::2 4 100 113 111 0 01:32:39 Established 2
2001:DB8:3::3 4 100 125 122 0 01:43:29 Established 2 5.在PE设备之间建立SRv6 BE路径
# 配置PE1。
[~PE1] segment-routing ipv6
[*PE1-segment-routing-ipv6] encapsulation source-address 2001:DB8:1::1
[*PE1-segment-routing-ipv6] locator PE1 ipv6-prefix 2001:DB8:11:: 64 static 32
[*PE1-segment-routing-ipv6-locator] quit
[*PE1-segment-routing-ipv6] quit
[*PE1] isis 1
[*PE1-isis-1] segment-routing ipv6 locator PE1
[*PE1-isis-1] quit
[*PE1] evpl instance 1
[*PE1-evpl1] segment-routing ipv6 locator PE1
[*PE1-evpl1] quit
[*PE1] evpn vpn-instance evrf1 vpws
[*PE1-vpws-evpn-instance-evrf1] segment-routing ipv6 best-effort
[*PE1-vpws-evpn-instance-evrf1] quit
[*PE1] commit# 配置PE2。
[~PE2] segment-routing ipv6
[*PE2-segment-routing-ipv6] encapsulation source-address 2001:DB8:2::2
[*PE2-segment-routing-ipv6] locator PE2 ipv6-prefix 2001:DB8:21:: 64 static 32
[*PE2-segment-routing-ipv6-locator] quit
[*PE2-segment-routing-ipv6] quit
[*PE2] isis 1
[*PE2-isis-1] segment-routing ipv6 locator PE2
[*PE2-isis-1] quit
[*PE2] evpl instance 1
[*PE2-evpl1] segment-routing ipv6 locator PE2
[*PE2-evpl1] quit
[*PE2] evpn vpn-instance evrf1 vpws
[*PE2-vpws-evpn-instance-evrf1] segment-routing ipv6 best-effort
[*PE2-vpws-evpn-instance-evrf1] quit
[*PE2] commit# 配置PE3。
[~PE3] segment-routing ipv6
[*PE3-segment-routing-ipv6] encapsulation source-address 2001:DB8:3::3
[*PE3-segment-routing-ipv6] locator PE3 ipv6-prefix 2001:DB8:31:: 64 static 32
[*PE3-segment-routing-ipv6-locator] quit
[*PE3-segment-routing-ipv6] quit
[*PE3] isis 1
[*PE3-isis-1] segment-routing ipv6 locator PE3
[*PE3-isis-1] quit
[*PE3] evpl instance 1
[*PE3-evpl1] segment-routing ipv6 locator PE3
[*PE3-evpl1] quit
[*PE3] evpn vpn-instance evrf1 vpws
[*PE3-vpws-evpn-instance-evrf1] segment-routing ipv6 best-effort
[*PE3-vpws-evpn-instance-evrf1] quit
[*PE3] commit在PE上通过命令display segment-routing ipv6 local-sid end-dx2 forwarding，查看SRv6 BE的Local SID表信息。以PE1为例：
[~PE1] display segment-routing ipv6 local-sid end-dx2 forwarding
My Local-SID End.DX2 Forwarding Table
-------------------------------------
SID : 2001:DB8:11::1:0:20/128 FuncType : End.DX2
EVPL ID : 1
LocatorName: PE1 LocatorID: 1
Total SID(s): 1 6.在PE设备上配置将相应的EVPL实例绑定到接入侧子接口
# 配置PE1。
[~PE1] interface gigabitethernet 3/0/0.1 mode l2
[*PE1-GigabitEthernet3/0/0.1] encapsulation dot1q vid 10
[*PE1-GigabitEthernet3/0/0.1] evpl instance 1
[*PE1-GigabitEthernet3/0/0.1] quit
[*PE1] commit# 配置PE2。
[~PE2] e-trunk 1
[*PE2-e-trunk-1] priority 10
[*PE2-e-trunk-1] peer-ipv6 2001:DB8:3::3 source-ipv6 2001:DB8:2::2
[*PE2-e-trunk-1] security-key cipher 00E0FC000000
[*PE2-e-trunk-1] quit
[*PE2] interface eth-trunk 10
[*PE2-Eth-Trunk10] mode lacp-static
[*PE2-Eth-Trunk10] e-trunk 1
[*PE2-Eth-Trunk10] quit
[*PE2] interface eth-trunk 10.1 mode l2
[*PE2-Eth-Trunk10.1] encapsulation dot1q vid 10
[*PE2-Eth-Trunk10.1] evpl instance 1
[*PE2-Eth-Trunk10.1] quit
[*PE2] interface gigabitethernet 3/0/0
[*PE2-GigabitEthernet3/0/0] eth-trunk 10
[*PE2-GigabitEthernet3/0/0] quit
[*PE2] commit# 配置PE3。
[~PE3] e-trunk 1
[*PE3-e-trunk-1] priority 10
[*PE3-e-trunk-1] peer-ipv6 2001:DB8:2::2 source-ipv6 2001:DB8:3::3
[*PE3-e-trunk-1] security-key cipher 00E0FC000000
[*PE3-e-trunk-1] quit
[*PE3] interface eth-trunk 10
[*PE3-Eth-Trunk10] mode lacp-static
[*PE3-Eth-Trunk10] e-trunk 1
[*PE3-Eth-Trunk10] quit
[*PE3] interface eth-trunk 10.1 mode l2
[*PE3-Eth-Trunk10.1] encapsulation dot1q vid 10
[*PE3-Eth-Trunk10.1] evpl instance 1
[*PE3-Eth-Trunk10.1] quit
[*PE3] interface gigabitethernet 3/0/0
[*PE3-GigabitEthernet3/0/0] eth-trunk 10
[*PE3-GigabitEthernet3/0/0] quit
[*PE3] commit7.在PE2和PE3上配置基于ESI粒度设置冗余模式
# 配置PE2。
[~PE2] evpn
[*PE2-evpn] esi 0001.0002.0003.0004.0005
[*PE2-evpn-esi-0001.0002.0003.0004.0005] evpn redundancy-mode single-active
[*PE2-evpn-esi-0001.0002.0003.0004.0005] quit
[*PE2-evpn] quit
[*PE2] interface Eth-Trunk 10
[*PE2-Eth-Trunk10] esi 0001.0002.0003.0004.0005
[*PE2-Eth-Trunk10] e-trunk mode auto
[*PE2-Eth-Trunk10] quit
[*PE2] commit# 配置PE3。
[~PE3] evpn
[*PE3-evpn] esi 0001.0002.0003.0004.0005
[*PE3-evpn-esi-0001.0002.0003.0004.0005] evpn redundancy-mode single-active
[*PE3-evpn-esi-0001.0002.0003.0004.0005] quit
[*PE3-evpn] quit
[*PE3] interface Eth-Trunk 10
[*PE3-Eth-Trunk10] esi 0001.0002.0003.0004.0005
[*PE3-Eth-Trunk10] e-trunk mode auto
[*PE3-Eth-Trunk10] quit
[*PE3] commit8.配置CE接入PE
# 配置CE1。
<CE1> system-view
[~CE1] vlan 10
[*CE1-vlan10] quit
[*CE1] interface gigabitethernet 1/0/0
[*CE1-GigabitEthernet1/0/0] portswitch
[*CE1-GigabitEthernet1/0/0] undo shutdown
[*CE1-GigabitEthernet1/0/0] port link-type access
[*CE1-GigabitEthernet1/0/0] port default vlan 10
[*CE1-GigabitEthernet1/0/0] commit
[~CE1-GigabitEthernet1/0/0] quit# 配置CE2。
<CE2> system-view
[~CE2] vlan 10
[*CE2-vlan10] quit
[*CE2] interface gigabitethernet 1/0/0
[*CE2-GigabitEthernet1/0/0] portswitch
[*CE2-GigabitEthernet1/0/0] undo shutdown
[*CE2-GigabitEthernet1/0/0] port link-type access
[*CE2-GigabitEthernet1/0/0] port default vlan 10
[*CE2-GigabitEthernet1/0/0] quit
[*CE2] interface gigabitethernet 2/0/0
[*CE2-GigabitEthernet2/0/0] portswitch
[*CE2-GigabitEthernet2/0/0] undo shutdown
[*CE2-GigabitEthernet2/0/0] port link-type access
[*CE2-GigabitEthernet2/0/0] port default vlan 10
[*CE2-GigabitEthernet2/0/0] commit
[~CE2-GigabitEthernet2/0/0] quit配置完成之后，Eth-Trunk应该Up。在PE2和PE3上执行display eth-trunk命令查看Eth-Trunk的状态。
PE2上的显示：
[~PE2] display eth-trunk 10
Eth-Trunk10's state information is:
WorkingMode: NORMAL Hash arithmetic: According to flow
Least Active-linknumber: 1 Max Bandwidth-affected-linknumber: 32
Operate status: up Number Of Up Ports In Trunk: 1
--------------------------------------------------------------------------------
PortName Status Weight
GigabitEthernet3/0/0 Up 1 PE3上的显示：
[~PE3] display eth-trunk 10
Eth-Trunk10's state information is:
WorkingMode: NORMAL Hash arithmetic: According to flow
Least Active-linknumber: 1 Max Bandwidth-affected-linknumber: 32
Operate status: down Number Of Up Ports In Trunk: 0
--------------------------------------------------------------------------------
PortName Status Weight
GigabitEthernet3/0/0 Down 1 从显示信息可以看出，对于Eth-Trunk 10，PE2处于主状态，PE3处于备状态。
9.检查配置结果
在PE上通过配置命令display bgp evpn all routing-table，可以看到远端发来的EVPN路由。以PE1为例：
[~PE1] display bgp evpn all routing-table
Local AS number : 100
BGP Local router ID is 1.1.1.1
Status codes: * - valid, > - best, d - damped, x - best external, a - add path,
h - history, i - internal, s - suppressed, S - Stale
Origin : i - IGP, e - EGP, ? - incomplete
EVPN address family:
Number of A-D Routes: 5
Route Distinguisher: 100:1
Network(ESI/EthTagId) NextHop
*> 0000.0000.0000.0000.0000:100 127.0.0.1
Route Distinguisher: 200:1
Network(ESI/EthTagId) NextHop
*>i 0001.0002.0003.0004.0005:200 2001:DB8:2::2
Route Distinguisher: 300:1
Network(ESI/EthTagId) NextHop
*>i 0001.0002.0003.0004.0005:200 2001:DB8:3::3
Route Distinguisher: 2.2.2.2:0
Network(ESI/EthTagId) NextHop
*>i 0001.0002.0003.0004.0005:4294967295 2001:DB8:2::2
Route Distinguisher: 3.3.3.3:0
Network(ESI/EthTagId) NextHop
*>i 0001.0002.0003.0004.0005:4294967295 2001:DB8:3::3
EVPN-Instance evrf1:
Number of A-D Routes: 5
Network(ESI/EthTagId) NextHop
*> 0000.0000.0000.0000.0000:100 127.0.0.1
*>i 0001.0002.0003.0004.0005:200 2001:DB8:2::2
* i 2001:DB8:3::3
*>i 0001.0002.0003.0004.0005:4294967295 2001:DB8:2::2
* i 2001:DB8:3::3 在PE1上通过配置命令display bgp evpn all routing-table ad-route，可以看到远端发来的EVPN路由的详细信息。
[~PE1] display bgp evpn all routing-table ad-route 0001.0002.0003.0004.0005:200
BGP local router ID : 1.1.1.1
Local AS number : 100
Total routes of Route Distinguisher(200:1): 1
BGP routing table entry information of 0001.0002.0003.0004.0005:200:
Label information (Received/Applied): 3/NULL
From: 2001:DB8:2::2 (2.2.2.2)
Route Duration: 0d00h18m33s
Relay IP Nexthop: FE80::3AC2:67FF:FE31:307
Relay IP Out-Interface:GigabitEthernet1/0/0
Relay Tunnel Out-Interface:
Original nexthop: 2001:DB8:2::2
Qos information : 0x0
Ext-Community: RT <1 : 1>, SoO <2.2.2.2 : 0>, EVPN L2 Attributes <MTU:1500 C:0 P:1 B:0>
Prefix-sid: 2001:DB8:21::1:0:3E
AS-path Nil, origin incomplete, localpref 100, pref-val 0, valid, internal, best, select, pre 255, IGP cost 10
Route Type: 1 (Ethernet Auto-Discovery (A-D) route)
ESI: 0001.0002.0003.0004.0005, Ethernet Tag ID: 200
Not advertised to any peer yet
Total routes of Route Distinguisher(300:1): 1
BGP routing table entry information of 0001.0002.0003.0004.0005:200:
Label information (Received/Applied): 3/NULL
From: 2001:DB8:3::3 (3.3.3.3)
Route Duration: 0d00h01m06s
Relay IP Nexthop: FE80::3AC2:67FF:FE41:305
Relay IP Out-Interface:GigabitEthernet2/0/0
Relay Tunnel Out-Interface:
Original nexthop: 2001:DB8:3::3
Qos information : 0x0
Ext-Community: RT <1 : 1>, SoO <3.3.3.3 : 0>, EVPN L2 Attributes <MTU:1500 C:0 P:0 B:1>
Prefix-sid: 2001:DB8:31::1:0:3E
AS-path Nil, origin incomplete, localpref 100, pref-val 0, valid, internal, best, select, pre 255, IGP cost 10
Route Type: 1 (Ethernet Auto-Discovery (A-D) route)
ESI: 0001.0002.0003.0004.0005, Ethernet Tag ID: 200
Not advertised to any peer yet
EVPN-Instance evrf1:
Number of A-D Routes: 2
BGP routing table entry information of 0001.0002.0003.0004.0005:200:
Route Distinguisher: 200:1
Remote-Cross route
Label information (Received/Applied): 3/NULL
From: 2001:DB8:2::2 (2.2.2.2)
Route Duration: 0d00h18m45s
Relay IP Nexthop: FE80::3AC2:67FF:FE31:307
Relay IP Out-Interface:GigabitEthernet1/0/0
Relay Tunnel Out-Interface:
Original nexthop: 2001:DB8:2::2
Qos information : 0x0
Ext-Community: RT <1 : 1>, SoO <2.2.2.2 : 0>, EVPN L2 Attributes <MTU:1500 C:0 P:1 B:0>
Prefix-sid: 2001:DB8:21::1:0:3E
AS-path Nil, origin incomplete, localpref 100, pref-val 0, valid, internal, best, select, pre 255, IGP cost 10
Route Type: 1 (Ethernet Auto-Discovery (A-D) route)
ESI: 0001.0002.0003.0004.0005, Ethernet Tag ID: 200
Not advertised to any peer yet
BGP routing table entry information of 0001.0002.0003.0004.0005:200:
Route Distinguisher: 300:1
Remote-Cross route
Label information (Received/Applied): 3/NULL
From: 2001:DB8:3::3 (3.3.3.3)
Route Duration: 0d00h01m19s
Relay IP Nexthop: FE80::3AC2:67FF:FE41:305
Relay IP Out-Interface:GigabitEthernet2/0/0
Relay Tunnel Out-Interface:
Original nexthop: 2001:DB8:3::3
Qos information : 0x0
Ext-Community: RT <1 : 1>, SoO <3.3.3.3 : 0>, EVPN L2 Attributes <MTU:1500 C:0 P:0 B:1>
Prefix-sid: 2001:DB8:31::1:0:3E
AS-path Nil, origin incomplete, localpref 100, pref-val 0, valid, internal, pre 255, IGP cost 10, not preferred for L2 ext-community
Route Type: 1 (Ethernet Auto-Discovery (A-D) route)
ESI: 0001.0002.0003.0004.0005, Ethernet Tag ID: 200
Not advertised to any peer yet 从以上信息可以看出，对于EVPN实例evrf1，存在一条优选路由
0001.0002.0003.0004.0005:200，下一跳指向PE2，另外一条指向PE3的路由虽然活跃，但是没有优选，说明双归单活已经形成。
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