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How to push traffic to SR Policy ??

topology.png

Intention:

Forwarding traffic destined for vrf A & traffic destined for R6 l01(66.66.66.66/32) based on SRTE explicit path

My SR Policy on head-end router is UP, receiving prefix from remote PE with proper next-hop and color ext community

 

I am new to SRTE and trying to explore it.

 

my understanding traffic should automatically choose the SRTE policy if the next-hop matches the policy endpoint and prefix match the color.

 

but in my case it interested traffic not using the SRTE path.

 

Am I missing something ?

R6 configuration:(End Point)

Setting color for interested traffic one vpnv4 route and one ipv4 route

 

extcommunity-set opaque RED

  10

end-set

!

route-policy SETCOLOR

  if extcommunity rt matches-any (100:20) then

    set extcommunity color RED

  endif

  if destination in (66.66.66.66/32) then

    set extcommunity color RED

  endif

  pass

end-policy

!

router bgp 100

 address-family ipv4 unicast

  network 66.66.66.66/32

 !

 address-family vpnv4 unicast

 !

 neighbor 1.1.1.1

  remote-as 100

  update-source Loopback0

  address-family ipv4 unicast

   route-policy SETCOLOR out

  !

  address-family vpnv4 unicast

   route-policy SETCOLOR out

  !

 

Head end configuration on R1

 

ipv4 unnumbered mpls traffic-eng Loopback0 

!

segment-routing

 global-block 16600 16699

 traffic-eng

  segment-list SLIST1

   index 10 address ipv4 2.2.2.2

   index 20 address ipv4 4.4.4.4

   index 30 address ipv4 3.3.3.3

   index 40 address ipv4 5.5.5.5

   index 50 address ipv4 6.6.6.6

  !

  policy 100

   binding-sid mpls 111

   color 10 end-point ipv4 6.6.6.6

   candidate-paths

    preference 100

     explicit segment-list SLIST1

     !

    !

   !

  !

 !

!

Tunnel is UP

RP/0/0/CPU0:R-1#show mpls forwarding tunnels detail

Wed Sep 11 00:02:19.600 UTC

Tunnel        Outgoing    Outgoing     Next Hop        Bytes      

Name          Label       Interface                    Switched   

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

100          (SR) 16204       Gi0/0/0/0    10.1.2.2        0          

     Updated: Sep 10 23:15:57.840

     Version: 699, Priority: 2

     Label Stack (Top -> Bottom): { 16204 16403 16305 16506 }

     NHID: 0x0, Encap-ID: N/A, Path idx: 0, Backup path idx: 0, Weight: 0

     MAC/Encaps: 14/30, MTU: 1500

     Outgoing Interface: GigabitEthernet0/0/0/0 (ifhandle 0x00000040)

     Packets Switched: 0

 

  Interface:

    Name: 100 (ifhandle 0x00000050)

    Local Label: 24005, Forwarding Class: 0, Weight: 0

    Packets/Bytes Switched: 0/0

RP/0/0/CPU0:R-1#

RP/0/0/CPU0:R-1#show segment-routing traffic-eng policy detail

Wed Sep 11 00:04:17.602 UTC

 

SR-TE policy database

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

 

Name: 100 (Color: 10, End-point: 6.6.6.6)

  Status:

    Admin: up  Operational: up for 00:48:19 (since Sep 10 23:15:57.711)

  Candidate-paths:

    Preference 100:

      Explicit: segment-list SLIST1 (active)

        Weight: 0, Metric Type: IGP

          16602 [Prefix-SID, 2.2.2.2]

          16204 [Prefix-SID, 4.4.4.4]

          16403 [Prefix-SID, 3.3.3.3]

          16305 [Prefix-SID, 5.5.5.5]

          16506 [Prefix-SID, 6.6.6.6]

  Attributes:

    Binding SID: 111

      Allocation mode: explicit

      State: Programmed

      Policy selected: yes

    Forward Class: 0

 

Head end receving BGP prefixes with proper colors

RP/0/0/CPU0:R-1#show bgp vpnv4 un vrf A 20.200.200.1

Wed Sep 11 00:03:19.856 UTC

BGP routing table entry for 20.200.200.0/24, Route Distinguisher: 100:20

Versions:

  Process           bRIB/RIB  SendTblVer

  Speaker                932         932

Last Modified: Sep 10 23:57:54.918 for 00:05:25

Paths: (1 available, best #1)

  Not advertised to any peer

  Path #1: Received by speaker 0

  Not advertised to any peer

  Local

    6.6.6.6 (metric 40) from 6.6.6.6 (6.6.6.6)

      Received Label 24006

      Origin incomplete, metric 2, localpref 100, valid, internal, best, group-best, import-candidate, imported

      Received Path ID 0, Local Path ID 1, version 932

      Extended community: Color:10 OSPF route-type:0:1:0x0 OSPF router-id:20.0.2.1 RT:100:20

      Source AFI: VPNv4 Unicast, Source VRF: A, Source Route Distinguisher: 100:20

RP/0/0/CPU0:R-1#

RP/0/0/CPU0:R-1#show bgp ipv4 unicast 66.66.66.66

Wed Sep 11 00:07:30.079 UTC

BGP routing table entry for 66.66.66.66/32

Versions:

  Process           bRIB/RIB  SendTblVer

  Speaker                112         112

Last Modified: Sep 10 23:57:54.918 for 00:09:35

Paths: (1 available, best #1)

  Not advertised to any peer

  Path #1: Received by speaker 0

  Not advertised to any peer

  Local

    6.6.6.6 (metric 40) from 6.6.6.6 (6.6.6.6)

      Origin IGP, metric 0, localpref 100, valid, internal, best, group-best

      Received Path ID 0, Local Path ID 1, version 112

      Extended community: Color:10

RP/0/0/CPU0:R-1#

 

But traffic is using IGP PATH

 

RP/0/0/CPU0:R-1#traceroute vrf A 20.200.200.1   

Wed Sep 11 00:12:15.379 UTC

 

Type escape sequence to abort.

Tracing the route to 20.200.200.1

 

 1  10.1.2.2 [MPLS: Labels 16206/24006 Exp 0] 79 msec  19 msec  19 msec

 2  10.2.3.2 [MPLS: Labels 16306/24006 Exp 0] 19 msec  19 msec  19 msec

 3  10.3.6.2 [MPLS: Label 24006 Exp 0] 19 msec  19 msec  19 msec

 4  20.0.2.2 19 msec  *  9 msec

RP/0/0/CPU0:R-1#traceroute 66.66.66.66          

Wed Sep 11 00:12:41.347 UTC

 

Type escape sequence to abort.

Tracing the route to 66.66.66.66

 

 1  10.1.4.2 [MPLS: Label 16406 Exp 0] 0 msec  0 msec  0 msec

 2  10.3.4.1 [MPLS: Label 16306 Exp 0] 0 msec  0 msec  0 msec

 3  10.3.6.2 0 msec  *  0 msec

RP/0/0/CPU0:R-1#

 

3 REPLIES 3
Cisco Employee

Re: How to push traffic to SR Policy ??

Hi Samarjit,

 

What version of XR are you using on R-1?

 

Regards,

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
Beginner

Re: How to push traffic to SR Policy ??

I am also using 6.4.2.

 

I saw your reply on the other discussion ...

https://community.cisco.com/t5/mpls/mpls-l3vpn-over-sr-te-policy/m-p/3777357

 

Need to try it on 6.5.2 or higher.

 

thanks for looking into it.

Cisco Employee

Re: How to push traffic to SR Policy ??

You are very welcome. I am glad I could help.

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México
Paseo de la Reforma 222
Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
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