基于VRF的BGP建聯

本文解決核心問題是單一CE節點到PE節點指定VRF的BGP建鄰居。

SpineWork-ce-pe-rr

  整體網絡拓撲上圖所示，PE彙聚路由已與邊緣客戶路由建鄰，指派10.10.10.0/24網段。重點：其中PE端上與CE端互聯的端口必須已指定到建立好的vrf或netns上，該工作需要LinuxShell中執行iproute2指令。

1.PE

彙聚路由BGP設定入下圖所示

router bgp 100
 bgp router-id 10.10.20.2
!
router bgp 100 vrf vrf1
 bgp router-id 10.10.10.1
 neighbor 10.10.10.2 remote-as 50
 !
 address-family ipv4 unicast
  rd vpn export 100:10
  rt vpn both 100:10
 exit-address-family
!
           

2.CE

邊緣路由BGP設定入下圖所示

router bgp 50
 bgp router-id 10.10.10.2
 network 192.168.1.0/24
 neighbor 10.10.10.1 remote-as 100
!
           

3.查詢BGP聯通

#通過如下指令，确認BGP建立連接配接狀态;其中00:19:34後面的數字1,代表接收的路由條目；
$show ip bgp vrf vrf1 summary
IPv4 Unicast Summary:
BGP router identifier 10.10.10.1, local AS number 100 vrf-id 1
BGP table version 1
RIB entries 1, using 184 bytes of memory
Peers 1, using 20 KiB of memory

Neighbor        V         AS MsgRcvd MsgSent   TblVer  InQ OutQ  Up/Down State/PfxRcd
10.10.10.2      4         50      24      23        0    0    0 00:19:34            1
Total number of neighbors 1
           

#通過如下指令，确定轉發到vrf1中的路由
$show ip bgp vrf vrf1
BGP table version is 1, local router ID is 10.10.10.1, vrf id 1
Default local pref 100, local AS 100
Status codes:  s suppressed, d damped, h history, * valid, > best, = multipath,
               i internal, r RIB-failure, S Stale, R Removed
Nexthop codes: @NNN nexthop's vrf id, < announce-nh-self
Origin codes:  i - IGP, e - EGP, ? - incomplete

   Network          Next Hop            Metric LocPrf Weight Path
*> 192.168.1.0/24   10.10.10.2               0             0 50 i

Displayed  1 routes and 1 total paths