Auto route injection via a tunnel -link failure
Auto route injection via a tunnel -link failure
ISP1
ISP2
R1
R2
R3
R4
24.10/16
140.15/16
24.10.6/24
140.15.7/24
24.10.6.14
140.15.7.4
route to
24.10.6/24
1. R3 detects that connectivity
through R4 is gone
2. R3 establishes GRE tunnel to R2
3. R3 establishes BGP peering with
R2 (over the tunnel)
4. R2 advertises 140.15.7/24 to R3
GRE Tunnel
route to 140.15.7/24
route to 24.10/16
route to 140.15/16