VXLAN+EVPN组网问题

拓扑图：

问题1（BGP BFD时间无法调整）：

目前结构中想做高可用，配置OSPF结合BFD，BGP结合BFD（时间无法更改）

<SPINE-1>display bfd session

 Total Session Num: 5     Up Session Num: 5     Init Mode: Active

 IPv4 session working in control packet mode:

 LD/RD          SourceAddr      DestAddr        State    Holdtime    Interface

 34881/34887    192.168.2.1     192.168.2.2     Up       225ms       GE1/0/1

 34882/34884    192.168.3.1     192.168.3.2     Up       217ms       GE1/0/2

 34883/34888    2.2.2.2         4.4.4.4         Up       1658ms      N/A

 34884/34885    2.2.2.2         3.3.3.3         Up       1915ms      N/A

 34885/34885    2.2.2.2         5.5.5.5         Up       1796ms      N/A

<SPINE-2>display bfd session

 Total Session Num: 5     Up Session Num: 5     Init Mode: Active

 IPv4 session working in control packet mode:

 LD/RD          SourceAddr      DestAddr        State    Holdtime    Interface

 34881/34881    192.168.5.1     192.168.5.2     Up       233ms       GE1/0/1

 34882/34882    192.168.6.1     192.168.6.2     Up       293ms       GE1/0/2

 34883/34886    3.3.3.3         4.4.4.4         Up       1740ms      N/A

 34884/34883    3.3.3.3         5.5.5.5         Up       1762ms      N/A

 34885/34884    3.3.3.3         2.2.2.2         Up       1980ms      N/A

问题2（RR客户端实现0.0.0.0负载均衡）:

SPINE1/2作为RR反射路由，两台设备均引入了0.0.0.0/0路由，但是在LEAF-1、DMZ-1看到的0.0.0.0路由各有1条（SPINE-1，SPINE-2）发来的，目的想在LEAF-1,DMZ-1实现0.0.0.0/0负载均衡。

LEAF-1-BGP-L2VPN路由表

[LEAF-1]display bgp l2vpn evpn 0.0.0.0

 BGP local router ID is 4.4.4.4

 Status codes: * - valid, > - best, d - dampened, h - history

               s - suppressed, S - stale, i - internal, e - external

               a - additional-path

       Origin: i - IGP, e - EGP, ? - incomplete

 Total number of routes from all PEs: 2

 Route distinguisher: 1:3

 Total number of routes: 2

* >i Network : [5][0][0][0.0.0.0]/80

     NextHop : 2.2.2.2                                  LocPrf    : 100

     PrefVal : 0                                        OutLabel  : NULL

     MED     : 0

     Path/Ogn: ?

*  i Network : [5][0][0][0.0.0.0]/80

     NextHop : 3.3.3.3                                  LocPrf    : 100

     PrefVal : 0                                        OutLabel  : NULL

     MED     : 0

     Path/Ogn: ?

LEAF-1-BGP-IPV4路由表

[LEAF-1]display bgp routing-table ipv4 vpn-instance vxlan10

 Total number of routes: 2

 BGP local router ID is 4.4.4.4

 Status codes: * - valid, > - best, d - dampened, h - history

               s - suppressed, S - stale, i - internal, e - external

               a - additional-path

       Origin: i - IGP, e - EGP, ? - incomplete

     Network            NextHop         MED        LocPrf     PrefVal Path/Ogn

* >i 0.0.0.0            2.2.2.2         0          100        0       ?

* >i 20.1.1.0/24        5.5.5.5         0          100        0       i

Dmz-1-BGP-L2VPN路由表

[DMZ-1]display bgp l2vpn evpn 0.0.0.0

 BGP local router ID is 5.5.5.5

 Status codes: * - valid, > - best, d - dampened, h - history

               s - suppressed, S - stale, i - internal, e - external

               a - additional-path

       Origin: i - IGP, e - EGP, ? - incomplete

 Total number of routes from all PEs: 2

 Route distinguisher: 1:3

 Total number of routes: 2

* >i Network : [5][0][0][0.0.0.0]/80

     NextHop : 2.2.2.2                                  LocPrf    : 100

     PrefVal : 0                                        OutLabel  : NULL

     MED     : 0

     Path/Ogn: ?

*  i Network : [5][0][0][0.0.0.0]/80

     NextHop : 3.3.3.3                                  LocPrf    : 100

     PrefVal : 0                                        OutLabel  : NULL

     MED     : 0

     Path/Ogn: ?

DMZ-1-BGP-IPV4路由表

[DMZ-1]display bgp routing-table ipv4 vpn-instance dmz

 Total number of routes: 3

 BGP local router ID is 5.5.5.5

 Status codes: * - valid, > - best, d - dampened, h - history

               s - suppressed, S - stale, i - internal, e - external

               a - additional-path

       Origin: i - IGP, e - EGP, ? - incomplete

     Network            NextHop         MED        LocPrf     PrefVal Path/Ogn

* >i 0.0.0.0            2.2.2.2         0          100        0       ?

* >i 10.1.1.0/24        4.4.4.4         0          100        0       i

* >i 10.1.2.0/24        4.4.4.4         0          100        0       i

问题3（故障恢复时间）：

OSPF,BGP都配置的相应的BFD，BGP的BFD时间无法修改。同时在测试灾备状态时，

1.       将SPINE-1断电，LEAF-1,DMZ-1下挂的服务器需要等待20秒才能与外部通信（外部网络lo:1.1.1.1），怎么才能将恢复时间缩短？

2.       将SPINE-1断电，LEAF-1,DMZ-1下面的服务器互相通信，只丢一个包，这个满足需求。

具体请看配置文件。