Configure a Preferred Default-Route or Prefix Route for vEdge or cEdge

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Updated:August 29, 2022

Document ID:218112

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Introduction

This document describes how to configure Software-Defined Wide-Area Network (SD-WAN) Control Policy to prefer a default-route or prefix.

Requirements

Cisco recommends that you have knowledge of these topics:

Cisco SD-WAN Overlay Management Protocol (OMP).
SD-WAN Centralized Control Policy.

Components Used

The information in this document is based on these software and hardware versions:

Cisco cEdge version 17.3.3
Cisco vEdge version 20.3.2
Cisco vSmart Controller version 20.4.2

The information in this document was created from the devices in a specific lab environment. All of the devices used in this document started with a cleared (default) configuration. If your network is live, ensure that you understand the potential impact of any command.

Background Information

For the purpose of this demonstration, the lab is set up with 5 cEdges/vEdges on different Side IDs where Router01, Router02, and Router03 have a default-route configured in VPN 1.

vSmart system ip 10.1.1.7.
cEdge Router01 system ip 10.70.70.1, Site ID 70.
cEdge Router02 system ip 10.80.80.1, Site ID 80.
cEdge Router03 system ip 10.80.80.2, Site ID 80.
cEdge Router04 system ip 10.70.70.2, Site ID 40.
vEdge Router05 system ip 10.20.20.1, Site ID 20.

Router04 (10.70.70.2) and Router05 (10.20.20.1) receive and install the default-route from the Router01 (10.70.70.1), Router02 (10.80.80.1) and Router03 (10.80.80.1). There is no active Centralized policy or Localized policies applied to the devices, it is a Full-Mesh topology by default.

Router04 and Router05 receive a default-route from three different devices.

Router04# show sdwan omp routes 
Generating output, this might take time, please wait ...
Code:
C   -> chosen
I   -> installed
Red -> redistributed
Rej -> rejected
L   -> looped
R   -> resolved
S   -> stale
Ext -> extranet
Inv -> invalid
Stg -> staged
IA  -> On-demand inactive
U   -> TLOC unresolved
                                            PATH                      ATTRIBUTE                                                       
VPN    PREFIX              FROM PEER        ID     LABEL    STATUS    TYPE       TLOC IP          COLOR            ENCAP  PREFERENCE  
--------------------------------------------------------------------------------------------------------------------------------------
1      0.0.0.0/0           10.1.1.7          29     1002     C,I,R     installed  10.70.70.1       biz-internet     ipsec  -           
                           10.1.1.7          30     1005     C,I,R     installed  10.80.80.1       mpls             ipsec  -           
                           10.1.1.7          31     1003     C,I,R     installed  10.80.80.2       mpls             ipsec  -

Tip: The show sdwan omp routes output for cEdges can be large if the router receive to much routes. You can use show sdwan omp route vpn <ID> <prefix> to filter the output or also, you can use show sdwan omp route vpn <ID> | s <prefix> to filter all the sector output of the prefix in cEdges.

Router05# show omp routes vpn 1
Code:
C   -> chosen
I   -> installed
Red -> redistributed
Rej -> rejected
L   -> looped
R   -> resolved
S   -> stale
Ext -> extranet
Inv -> invalid
Stg -> staged
IA  -> On-demand inactive
U   -> TLOC unresolved

                                            PATH                      ATTRIBUTE                                                       
VPN    PREFIX              FROM PEER        ID     LABEL    STATUS    TYPE       TLOC IP          COLOR            ENCAP  PREFERENCE  
--------------------------------------------------------------------------------------------------------------------------------------
1      0.0.0.0/0           10.1.1.7          5      1002     C,I,R     installed  10.70.70.1       biz-internet     ipsec  -           
                           10.1.1.7          6      1005     C,I,R     installed  10.80.80.1       mpls             ipsec  -           
                           10.1.1.7          7      1003     C,I,R     installed  10.80.80.2       mpls             ipsec  -

Tip: The show omp route output for vEdges can be large if the router receives too routes. You can use show omp routes vpn <ID> <prefix> to filter the output in vEdges. You can use | tab next to the command to see the output in format table in vEdges.

Router04 (10.70.70.2) and Router05 (10.20.20.1) install the default-route from Router01 (10.70.70.1), Router02 (10.80.80.1), and Router03 (10.80.80.1).

Router04# show ip route vrf 1 

Routing Table: 1
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, m - OMP
       n - NAT, Ni - NAT inside, No - NAT outside, Nd - NAT DIA
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       H - NHRP, G - NHRP registered, g - NHRP registration summary
       o - ODR, P - periodic downloaded static route, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR
       & - replicated local route overrides by connected

Gateway of last resort is 10.80.80.2 to network 0.0.0.0

m*    0.0.0.0/0 [251/0] via 10.80.80.2, 00:05:02, Sdwan-system-intf
                [251/0] via 10.80.80.1, 00:05:02, Sdwan-system-intf
                [251/0] via 10.70.70.1, 00:05:02, Sdwan-system-intf

Tip: The show ip route vrf <ID> output for cEdges can be large if the router receives too routes. You can use show ip route vrf <ID> <prefix without mask> to filter the output, or also, you can use show ip route vrf <ID> | s <prefix>to filter all the sector output of the prefix.

Router05# show ip routes vpn 1 0.0.0.0/0
Codes Proto-sub-type:
  IA -> ospf-intra-area, IE -> ospf-inter-area,
  E1 -> ospf-external1, E2 -> ospf-external2,
  N1 -> ospf-nssa-external1, N2 -> ospf-nssa-external2,
  e -> bgp-external, i -> bgp-internal
Codes Status flags:
  F -> fib, S -> selected, I -> inactive,
  B -> blackhole, R -> recursive, L -> import

                                            PROTOCOL  NEXTHOP     NEXTHOP          NEXTHOP                                                   
VPN    PREFIX              PROTOCOL         SUB TYPE  IF NAME     ADDR             VPN      TLOC IP          COLOR            ENCAP  STATUS  
---------------------------------------------------------------------------------------------------------------------------------------------
1      0.0.0.0/0           omp              -         -           -                -        10.70.70.1       biz-internet     ipsec  F,S     
1      0.0.0.0/0           omp              -         -           -                -        10.80.80.1       mpls             ipsec  F,S     
1      0.0.0.0/0           omp              -         -           -                -        10.80.80.2       mpls             ipsec  F,S

Tip: The show ip routes output for vEdges can be large if the router receives too routes. You can use show ip routes vpn <ID> <prefix> to filter the output in vEdges.

Configurations

Solution 1: Centralized Control-Policy Usage to Prefer the Default-Route from Router01 on Specific Remote Router Router04

Use a Topology Custom Control and apply a preference for the default-route in the OMP.

Use Route Rule instead of Transport Location (TLOC) rule.

Match Conditions

Match originator option for Router01 System-ip 10.70.70.1 and Prefix-list predefined on policies lists with the 0.0.0.0/0 prefix.
ip prefix-list 0.0.0.0/0 just matches the default-route not all routes, so you can use this prefix for the prefix list.
ip prefix-list 0.0.0.0/0 le 32 matches all routes.

Action

Apply this policy in the outbound direction to Router04 site ID 40.

Template Policy Configuration

You can use vManage GUI to configure the Centralized Policy with the Control Policy.

Control policies are configured in Topology, and you can choose Hub-and-Spoke, Mesh, or Custom Control policies.

Custom Control(Route & TLOC) is used for this specific scenario, as shown in the image.

Add Custom Control Topology

Sequence type andSequence Rule is added.
Originator system-ip and prefix list are set in match conditions.

Accept and Preference is set on actions for same sequence, as shown in the image.

Custom Control Match Condition

Control Policy is applied in the outbound direction for site 40, as shown in the image.

Control Policy Application

Caution: To activate a Centralized Policy, the vSmart needs a device template attached, or the Centralized Policy send a Failed to activate policy error. The vSmart has to be in vManage mode.

CLI Policy Configuration

You can configure the vSmart manually instead of vManage GUI.

control-policy originatoronly
    sequence 1
     match route
      originator 10.70.70.1
      prefix-list Default_Route
     !
     action accept
      set
       preference 200
      !
     !
    !
  default-action accept
 !
 lists
  prefix-list Default_Route
   ip-prefix 0.0.0.0/0 
  !
  site-list sitio40
   site-id 40 
  !
 !
!
apply-policy
 site-list sitio40
  control-policy originatoronly out <<<<<<<
 !
!

The vSmart sends out to Router04 only the default-route from the originator Router01 (10.70.70.1) with a higher preference 200.

Caution: The default action is set to reject.
The default action can be set to accept or reject.

Caution: If the sequence is not matched, the routes take the default action.
It means that if the default action is set to reject and the route does not match any sequence, it is rejected from the vSmart and it is not advertised to the overlay.
If the default action is set to accept and the route does not match any sequence, it is accepted from the vsmart and advertised to the overlay.

Verify

You can use the show running-config policy command on vSmart to verify that the Control-Policy is applied correctly.

vsmart# show running-config policy control-policy 
policy
 control-policy originatoronly
  sequence 1
   match route
    originator  10.70.70.1
    prefix-list Default_Route
   !
   action accept
    set
     preference 200
    !
   !
  !
  default-action accept
 !
!

Use show running-config apply-policy to check the site and direction that the Control-Policy is applied.

vsmart# show running-config apply-policy 
apply-policy
 site-list sitio40
  control-policy originatoronly out
 !
!

Tip: You can use show running-config policy control-policy <name> default-action | sequence to filter the output if the vSmart has many control policies.

Router04 (10.70.70.2) receives all the default-routes from Router01 (10.70.70.1), Router02 (10.80.80.1), and Router03 (10.80.80.1), but the default-route from Router01 have higher preference (200).

Router04# show sdwan omp routes 
Generating output, this might take time, please wait ...
Code:
C   -> chosen
I   -> installed
Red -> redistributed
Rej -> rejected
L   -> looped
R   -> resolved
S   -> stale
Ext -> extranet
Inv -> invalid
Stg -> staged
IA  -> On-demand inactive
U   -> TLOC unresolved
                                            PATH                      ATTRIBUTE                                                       
VPN    PREFIX              FROM PEER        ID     LABEL    STATUS    TYPE       TLOC IP          COLOR            ENCAP  PREFERENCE  
--------------------------------------------------------------------------------------------------------------------------------------
1      0.0.0.0/0           10.1.1.7          29     1002     C,I,R     installed  10.70.70.1       biz-internet     ipsec  200   <<<<<<<<<<<<      
                           10.1.1.7          30     1005     R         installed  10.80.80.1       mpls             ipsec  -           
                           10.1.1.7          31     1003     R         installed  10.80.80.2       mpls             ipsec  -

Router04 (10.70.70.2) installs only the route from Router01 (10.70.70.1) in the IP route table.

Router04# show ip route vrf 1

Routing Table: 1
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, m - OMP
       n - NAT, Ni - NAT inside, No - NAT outside, Nd - NAT DIA
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       H - NHRP, G - NHRP registered, g - NHRP registration summary
       o - ODR, P - periodic downloaded static route, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR
       & - replicated local route overrides by connected

Gateway of last resort is 10.70.70.1 to network 0.0.0.0

m*    0.0.0.0/0 [251/0] via 10.70.70.1, 00:13:25, Sdwan-system-intf

Router05 (10.20.20.1) is on site 20, still, receive and install all the default-routes from Router01 (10.70.70.1), Router02 (10.80.80.1), and Router03 (10.80.80.1).

Router05# show omp routes vpn 1
Code:
C   -> chosen
I   -> installed
Red -> redistribute
Rej -> rejected
L   -> looped
R   -> resolved
S   -> stale
Ext -> extranet
Inv -> invalid
Stg -> staged
IA  -> On-demand inactive
U   -> TLOC unresolved

                                            PATH                      ATTRIBUTE                                                       
VPN    PREFIX              FROM PEER        ID     LABEL    STATUS    TYPE       TLOC IP          COLOR            ENCAP  PREFERENCE  
--------------------------------------------------------------------------------------------------------------------------------------
1      0.0.0.0/0           10.1.1.7          5      1002     C,I,R     installed  10.70.70.1       biz-internet     ipsec  -     <<<<<< no preference      
                           10.1.1.7          6      1005     C,I,R     installed  10.80.80.1       mpls             ipsec  -           
                           10.1.1.7          7      1003     C,I,R     installed  10.80.80.2       mpls             ipsec  -           


Router05# show ip routes vpn 1  
Codes Proto-sub-type:
  IA -> ospf-intra-area, IE -> ospf-inter-area,
  E1 -> ospf-external1, E2 -> ospf-external2,
  N1 -> ospf-nssa-external1, N2 -> ospf-nssa-external2,
  e -> bgp-external, i -> bgp-internal
Codes Status flags:
  F -> fib, S -> selected, I -> inactive,
  B -> blackhole, R -> recursive, L -> import

                                            PROTOCOL  NEXTHOP     NEXTHOP          NEXTHOP                                                   
VPN    PREFIX              PROTOCOL         SUB TYPE  IF NAME     ADDR             VPN      TLOC IP          COLOR            ENCAP  STATUS  
---------------------------------------------------------------------------------------------------------------------------------------------
1      0.0.0.0/0           omp              -         -           -                -        10.70.70.1       biz-internet     ipsec  F,S     
1      0.0.0.0/0           omp              -         -           -                -        10.80.80.1       mpls             ipsec  F,S     
1      0.0.0.0/0           omp              -         -           -                -        10.80.80.2       mpls             ipsec  F,S

Solution 2: Centralized Control-Policy Usage to Prefer Default-Route from Router01 to all Routers in Full-Mesh

Use the same policy that Solution 1 used, and apply it in the inbound direction from Router01 site ID 70.

control-policy originatoronly
    sequence 1
     match route
      originator 10.70.70.1
      prefix-list Default_Route
     !
     action accept
      set
       preference 200
      !
     !
    !
  default-action accept
 !
 lists
  prefix-list Default_Route
   ip-prefix 0.0.0.0/0 
  !
  site-list SiteList_70
   site-id 70 
  !
 !
!
apply-policy
 site-list SiteList_70
  control-policy originatoronly in <<<<<<<<<
 !
!

Verify

If you use the inbound direction, Router04 (10.70.70.2) and Router05 (10.20.20.1) receive and install the default-route from Router01 (10.70.70.1) only.

Router04# show sdwan omp routes 
Generating output, this might take time, please wait ...
Code:
C   -> chosen
I   -> installed
Red -> redistributed
Rej -> rejected
L   -> looped
R   -> resolved
S   -> stale
Ext -> extranet
Inv -> invalid
Stg -> staged
IA  -> On-demand inactive
U   -> TLOC unresolved
                                            PATH                      ATTRIBUTE                                                       
VPN    PREFIX              FROM PEER        ID     LABEL    STATUS    TYPE       TLOC IP          COLOR            ENCAP  PREFERENCE  
--------------------------------------------------------------------------------------------------------------------------------------
1      0.0.0.0/0           10.1.1.7          29     1002     C,I,R     installed  10.70.70.1       biz-internet     ipsec  200        <<<<<<< 

Router05# show omp routes vpn 1
Code:
C   -> chosen
I   -> installed
Red -> redistributed
Rej -> rejected
L   -> looped
R   -> resolved
S   -> stale
Ext -> extranet
Inv -> invalid
Stg -> staged
IA  -> On-demand inactive
U   -> TLOC unresolved

                                            PATH                      ATTRIBUTE                                                       
VPN    PREFIX              FROM PEER        ID     LABEL    STATUS    TYPE       TLOC IP          COLOR            ENCAP  PREFERENCE  
--------------------------------------------------------------------------------------------------------------------------------------
1      0.0.0.0/0           10.1.1.7          5      1002     C,I,R     installed  10.70.70.1       biz-internet     ipsec  200         <<<<<<<

Consideration for both Scenarios: Inbound or Outbound Direction

If you lose Router01 (10.70.70.1), the routers install all default-routes that receive without preference. In this scenario, from Router02 (10.80.80.1) and Router03 (10.80.80.2):

Router04# show sdwan omp routes 
Generating output, this might take time, please wait ...
Code:
C   -> chosen
I   -> installed
Red -> redistributed
Rej -> rejected
L   -> looped
R   -> resolved
S   -> stale
Ext -> extranet
Inv -> invalid
Stg -> staged
IA  -> On-demand inactive
U   -> TLOC unresolved
                                            PATH                      ATTRIBUTE                                                       
VPN    PREFIX              FROM PEER        ID     LABEL    STATUS    TYPE       TLOC IP          COLOR            ENCAP  PREFERENCE  
--------------------------------------------------------------------------------------------------------------------------------------
1      0.0.0.0/0           10.1.1.7          36     1005     C,I,R     installed  10.80.80.1       mpls             ipsec  -           
                           10.1.1.7          37     1003     C,I,R     installed  10.80.80.2       mpls             ipsec  -           

Router05# show omp routes vpn 1
Code:
C   -> chosen
I   -> installed
Red -> redistributed
Rej -> rejected
L   -> looped
R   -> resolved
S   -> stale
Ext -> extranet
Inv -> invalid
Stg -> staged
IA  -> On-demand inactive
U   -> TLOC unresolved

                                            PATH                      ATTRIBUTE                                                       
VPN    PREFIX              FROM PEER        ID     LABEL    STATUS    TYPE       TLOC IP          COLOR            ENCAP  PREFERENCE  
--------------------------------------------------------------------------------------------------------------------------------------
1      0.0.0.0/0           10.1.1.7          14     1005     C,I,R     installed  10.80.80.1       mpls             ipsec  -           
                           10.1.1.7          15     1003     C,I,R     installed  10.80.80.2       mpls             ipsec  -

Solution 3: Centralized Control-Policy Usage to Prefer Default-Route From Router01 with Backup Default-Routes from other Routers

In this Solution, routers receive the default-router only from Router01 (10.70.70.1), but if you lose it, you want the backup default-route that remote routers install came from Router02 (10.80.80.1) and not from both Router02 (10.80.80.1) and Router03 (10.80.80.1) as in Solution 1 and Solution 2.

Add a sequence on the same Control Policy and apply a lower preference that you set from default-route for Router01 preference 200, but a higher than the default preference (100).

For the default-route advertised from Router02 (10.80.80.1), you can set a preference of 150.

control-policy originator
    sequence 1
     match route
      originator 10.70.70.1
      prefix-list Default_Route
     !
     action accept
      set
       preference 200
      !
     !
    !
    sequence 11   <<<<< new sequence
     match route
      originator 10.80.80.1     <<<<< Router02 system ip as originator
      prefix-list Default_Route
     !
     action accept
      set
       preference 150   <<< lower preference of Router01
      !
     !
    !
  default-action accept
 !
 lists
  prefix-list Default_Route
   ip-prefix 0.0.0.0/0 
  !
  site-list sitio40
   site-id 40 
  !
 !
!
apply-policy
 site-list sitio40
  control-policy originator out
 !
!

Verify

The router receives the default-routes with preferences of 200, 150, and default preference.

Router04# show sdwa omp routes 
Generating output, this might take time, please wait ...
Code:
C   -> chosen
I   -> installed
Red -> redistributed
Rej -> rejected
L   -> looped
R   -> resolved
S   -> stale
Ext -> extranet
Inv -> invalid
Stg -> staged
IA  -> On-demand inactive
U   -> TLOC unresolved
                                            PATH                      ATTRIBUTE                                                       
VPN    PREFIX              FROM PEER        ID     LABEL    STATUS    TYPE       TLOC IP          COLOR            ENCAP  PREFERENCE  
--------------------------------------------------------------------------------------------------------------------------------------
1      0.0.0.0/0           10.1.1.7          36     1005     R         installed  10.80.80.1       mpls             ipsec  150   <<<<<<<<      
                           10.1.1.7          37     1003     R         installed  10.80.80.2       mpls             ipsec  -           
                           10.1.1.7          38     1002     C,I,R     installed  10.70.70.1       biz-internet     ipsec  200   <<<<<<<<

Router04 (10.70.70.2) installs in routing table only the default-route from Router01 (10.70.70.1) with higher preference:

Router04# show ip route vrf 1  

Routing Table: 1
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, m - OMP
       n - NAT, Ni - NAT inside, No - NAT outside, Nd - NAT DIA
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       H - NHRP, G - NHRP registered, g - NHRP registration summary
       o - ODR, P - periodic downloaded static route, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR
       & - replicated local route overrides by connected

Gateway of last resort is 10.70.70.1 to network 0.0.0.0

m*    0.0.0.0/0 [251/0] via 10.70.70.1, 00:02:47, Sdwan-system-intf

If you lose Router01 (10.70.70.1), Router04 (10.70.70.2) installs only the route with the next higher preference from Router02 (10.80.80.1).

Router04# show sdwa omp routes 
Generating output, this might take time, please wait ...
Code:
C   -> chosen
I   -> installed
Red -> redistributed
Rej -> rejected
L   -> looped
R   -> resolved
S   -> stale
Ext -> extranet
Inv -> invalid
Stg -> staged
IA  -> On-demand inactive
U   -> TLOC unresolved
                                            PATH                      ATTRIBUTE                                                       
VPN    PREFIX              FROM PEER        ID     LABEL    STATUS    TYPE       TLOC IP          COLOR            ENCAP  PREFERENCE  
--------------------------------------------------------------------------------------------------------------------------------------
1      0.0.0.0/0           10.1.1.7          36     1005     C,I,R     installed  10.80.80.1       mpls             ipsec  150      <<<<<<<   
                           10.1.1.7          37     1003     R         installed  10.80.80.2       mpls             ipsec  -           
Router04# show ip route vrf 1  

Routing Table: 1
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
       E1 - OSPF external type 1, E2 - OSPF external type 2, m - OMP
       n - NAT, Ni - NAT inside, No - NAT outside, Nd - NAT DIA
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       H - NHRP, G - NHRP registered, g - NHRP registration summary
       o - ODR, P - periodic downloaded static route, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR
       & - replicated local route overrides by connected

Gateway of last resort is 10.80.80.1 to network 0.0.0.0

m*    0.0.0.0/0 [251/0] via 10.80.80.1, 00:00:15, Sdwan-system-intf

If you lose Router02, Router04 installs default-route from Router03 (10.80.80.1) that is the route with the default preference.

Tip: The inbound and outbound direction works on next way, the inbound if you want to advertise the preferences to all remote routers in Full-Mesh or the outbound if you want to advertise the preferences only to a specific remote site.

Solution 4: Centralized Control-Policy Usage to Prefer some Prefix Route

All previous solutions works exactly the same if you use any other prefix instead of the default-route prefix.

Example with prefix 10.40.40.0/24 advertised from Router01 (10.70.70.1) to Router04 (10.70.70.2).

control-policy originator
    sequence 1
     match route
      originator 10.70.70.1
      prefix-list prefix40
     !
     action accept
      set
       preference 200
      !
     !
    !
default-action accept
 !
 lists
  prefix-list prefix40
   ip-prefix 10.40.40.0/24 <<<<<<<<<
  !
  site-list sitio40
   site-id 40 
  !
 !
!
apply-policy
 site-list sitio40
  control-policy originator out
 !
!

Verify

Router04# show sdwan omp routes 
Generating output, this might take time, please wait ...
Code:
C   -> chosen
I   -> installed
Red -> redistributed
Rej -> rejected
L   -> looped
R   -> resolved
S   -> stale
Ext -> extranet
Inv -> invalid
Stg -> staged
IA  -> On-demand inactive
U   -> TLOC unresolved
                                            PATH                      ATTRIBUTE                                                       
VPN    PREFIX              FROM PEER        ID     LABEL    STATUS    TYPE       TLOC IP          COLOR            ENCAP  PREFERENCE  
--------------------------------------------------------------------------------------------------------------------------------------
1      0.0.0.0/0           10.1.1.7          36     1005     C,I,R     installed  10.80.80.1       mpls             ipsec  150         
                           10.1.1.7          37     1003     R         installed  10.80.80.2       mpls             ipsec  -          
1      10.40.40.0/24       10.1.1.7          13     1002     C,I,R     installed  10.70.70.1       biz-internet     ipsec  200      <<<<<<<<   
                           10.1.1.7          15     1005     R         installed  10.80.80.1       mpls             ipsec  -           
                           10.1.1.7          16     1003     R         installed  10.80.80.2       mpls             ipsec  -         

Router04# show ip route vrf 1

Routing Table: 1
Codes: L - local, C - connected, S - static, R - RIP, M - mobile, B - BGP
       D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area 
       N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2 
       E1 - OSPF external type 1, E2 - OSPF external type 2, m - OMP
       n - NAT, Ni - NAT inside, No - NAT outside, Nd - NAT DIA
       i - IS-IS, su - IS-IS summary, L1 - IS-IS level-1, L2 - IS-IS level-2
       ia - IS-IS inter area, * - candidate default, U - per-user static route
       H - NHRP, G - NHRP registered, g - NHRP registration summary
       o - ODR, P - periodic downloaded static route, l - LISP
       a - application route
       + - replicated route, % - next hop override, p - overrides from PfR
       & - replicated local route overrides by connected

Gateway of last resort is 10.80.80.1 to network 0.0.0.0

m*    0.0.0.0/0 [251/0] via 10.80.80.1, 00:11:55, Sdwan-system-intf 
      10.0.0.0/24 is subnetted, 1 subnets
m        10.40.40.0 [251/0] via 10.70.70.1, 00:02:17, Sdwan-system-intf  <<<<<<
Router04#

Related Information

Policies Configuration Guide for vEdge Routers, Cisco SD-WAN
Technical Support & Documentation - Cisco Systems

Revision History

Revision	Publish Date	Comments
1.0	30-Aug-2022	Initial Release

Contributed by Cisco Engineers

Ian Emanuel Estrada
Technical Consulting Engineer

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Configure a Preferred Default-Route or Prefix Route for vEdge or cEdge

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Contents

Introduction

Requirements

Components Used

Background Information

Configurations

Solution 1: Centralized Control-Policy Usage to Prefer the Default-Route from Router01 on Specific Remote Router Router04

Match Conditions

Action

Template Policy Configuration

CLI Policy Configuration

Verify

Solution 2: Centralized Control-Policy Usage to Prefer Default-Route from Router01 to all Routers in Full-Mesh

Verify

Consideration for both Scenarios: Inbound or Outbound Direction

Solution 3: Centralized Control-Policy Usage to Prefer Default-Route From Router01 with Backup Default-Routes from other Routers

Verify

Solution 4: Centralized Control-Policy Usage to Prefer some Prefix Route

Verify

Related Information

Revision History

Contributed by Cisco Engineers

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