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Part 3: Cisco SDWAN tloc extension (gre-to)

Cisco SDWAN tloc extension (gre-to)

By using a TLOC extension interface, a WAN Edge router can communicate with the adjacent WAN Edge router over the interface to use other WAN edge router ISP media. As we discuss that in our earlier article as well

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                      Cisco Viptela SDWAN: Part 1 TLOC extension             

           Part 2: Cisco SDWAN tloc extension (gre-from)

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As in our earlier article we discuss about tloc-extension-gre-from and now in this article we will talk about tloc-extension-gre-to

Fig 1.1- Cisco Viptela SDWAN TLOC

tloc-extension-gre-to
First thing, It can only work on the IOS-XE model devices used for the SDWAN features. These models are Cisco ISRs and ASRs.

Router 1 and Router 2 are connected by a GRE tunnel over an L3 network. An MPLS network and the VPLS are connected to Router 1.There are two routers on the same site, but Router 2 has no circuits and is on a different L3 network.

When you configure you need to add one thing here 

tloc-extension-gre-to <extended-interface-ip-address>

<extended-interface-ip-address>: GRE tunnel destination IP address of the interface that you are extended to another router in the branch

Sample configuration 

NDNA_C8300# show sdwan running-config

sdwan
interface ge0/0.11
  no shutdown
  encapsulation dot1 11
  ip address 10.10.10.1/24
 !              
 interface ge0/0.12 
  no shutdown
  encapsulation dot1 12
  ip address 20.20.20.1/24
 !
 interface Tunnel1
  no shutdown
  ip unnumbered GigabitEthernet0/0.11
  tunnel source GigabitEthernet0/0.11
  tunnel mode sdwan
 !
 interface Tunnel2
  no shutdown
  ip unnumbered GigabitEthernet0/0.12
  tunnel source GigabitEthernet0/0.12
  tunnel mode sdwan
 !
sdwan
 interface ge0/0.11
  tunnel-interface
   color Private 1
   tloc-extension-gre-to 30.30.30.1
 !
 interface ge0/0.12
  tunnel-interface
   color mpls
   tloc-extension-gre-to 40.40.40.1
 !
!

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