GRE tunnel for L3VPN

Latest reply: Nov 16, 2015 15:33:50 2023 1 0 0

GRE tunnel for L3VPN-1344877-1

Generally speaking, we use LSP tunnel, but in this case, the P router can’t support mpls, then we use GRE tunnel instead.

1.    At first, we should establish GRE tunnel between PE1 and PE2.

interface Tunnel0/2/4    (IP, tunnel protocol, source interface, destination)                                                      

 ip address 172.20.1.1 255.255.255.0                                           

 tunnel-protocol gre                                                            

 source LoopBack0                                                              

 destination 4.4.4.4

2.    How to make BGP use GRE tunnel? We just need to configure tunnel-policy at first and then use it under vpn-instance view.

tunnel-policy gre                                                              

 tunnel select-seq gre load-balance-number 1   

ip vpn-instance vpn                                                            

 ipv4-family                                                                   

  route-distinguisher 10:1                                                     

  tnl-policy gre                                                                

  vpn-target 100:1 export-extcommunity                                         

  vpn-target 100:1 import-extcommunity 

3.    After that, we can see vpn routing using GRE tunnel as interface.

dis ip routing-table vpn-instance vpn                              

Route Flags: R - relay, D - download to fib                                    

------------------------------------------------------------------------------ 

Routing Tables: vpn                                                            

         Destinations : 5        Routes : 5                                    

                                                                               

Destination/Mask    Proto   Pre  Cost      Flags NextHop         Interface     

                                                                                                                                                   

      100.4.5.0/24  IBGP    255  0          RD   4.4.4.4         Tunnel0/2/4 

  • x
  • convention:

Created Nov 16, 2015 15:33:50 Helpful(0) Helpful(0)

Thank you.
  • x
  • convention:

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