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Segment routing dynamic option

sachin30720041
Level 1
Level 1

Hello Everyone,

 

I am new to segment routing. I am trying to learn the dynamic option of segment routing traffic engineering. I have 2 directly connected routers.

R1---R2

R1's Gi0/0/0/1 IP address 100.10.20.1

R2'2 Gi0/0/0/1 IP address 100.10.20.2

1.1.1.1 is the loopback on r1.

2.2.2.2 is the loopback on r2.

Following is the configuration on R1. 

 

segment-routing

 traffic-eng

  !

  policy pc1

   color 10 end-point ipv4 2.2.2.2

   candidate-paths

    preference 100

     dynamic

      metric

       type igp

 

router isis 1

 net 49.0001.1111.1111.1111.00

 distribute link-state

 address-family ipv4 unicast

  metric-style wide

  mpls traffic-eng level-1-2

  mpls traffic-eng router-id Loopback0

  segment-routing mpls

 !

 interface Loopback0

  address-family ipv4 unicast

   prefix-sid index 1

  !

 !

 interface GigabitEthernet0/0/0/0

  address-family ipv4 unicast

  !

 !

 interface GigabitEthernet0/0/0/1

  address-family ipv4 unicast

 

mpls traffic-eng

 interface GigabitEthernet0/0/0/0

 !

Following is the config on R2.

router isis 1

 net 49.0001.2222.2222.2222.00

 distribute link-state

 address-family ipv4 unicast

  metric-style wide

  mpls traffic-eng level-1-2

  mpls traffic-eng router-id Loopback0

  segment-routing mpls

 !

 interface Loopback0

  address-family ipv4 unicast

   prefix-sid index 2

  !

 !

 interface GigabitEthernet0/0/0/0

  address-family ipv4 unicast

  !

 !

 interface GigabitEthernet0/0/0/1

  address-family ipv4 unicast

 

mpls traffic-eng

 interface GigabitEthernet0/0/0/0

 

But following command's output shows the invalid path to 2.2.2.2.

While 2.2.2.2 is pingable from 1.1.1.1.

r1#show segment-routing traffic-eng policy    

Fri Sep 10 07:11:23.710 UTC

 

SR-TE policy database

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

 

Color: 10, End-point: 2.2.2.2

  Name: srte_c_10_ep_2.2.2.2

  Status:

    Admin: up  Operational: down for 00:38:41 (since Sep 10 06:32:43.463)

  Candidate-paths:

    Preference: 100 (configuration)

      Name: pc1

      Requested BSID: dynamic

      Dynamic (invalid)

      Last error: No path found

 

srte interface is also down.

RP/0/RP0/CPU0:r1#show ip int br

Fri Sep 10 07:13:58.051 UTC

 

Interface                      IP-Address      Status          Protocol Vrf-Name

srte_c_10_ep_2.2.2.2           1.1.1.1         Down            Down     default 

 

I am not sure what configuration am I missing?

Thanks,

Sachin

 

32 Replies 32

thank you Very much @Harold Ritter  .

mailatgk
Level 1
Level 1

Hi @Harold Ritter ,

I am sorry to ask questions on SR-TE. Whenever i observe any issue in Segment routing , only  your name comes to my mind as you helped me earlier on Segment routing related issue.  Thanks a lot for that.  

Now i come up with different issue . I am using Nokia SR router in my topology . 

we have connected PCE to all the edge routers(PCC) (CER1_1, CER1_2, CER1_3, CER1_4) and trying to bring up SR-TE LSP with PCEP Controller on all edge routers.

PCE shows PCEP connection with all 4 edge routers as mentioned below  .I see BGP is UP and  SR-OSPF also UP on PCC routers.

PCEP Path Computation Element (PCE) Peer Info
-------------------------------------------------------------------------------
Peer Sync State Oper Keepalive/Oper DeadTimer
-------------------------------------------------------------------------------
92.168.96.23:4189 done 30/120
92.168.96.126:4189 done 30/120
92.168.97.16:4189 done 30/120
92.168.97.174:4189 done 30/120

mailatgk_0-1713976043035.png

 

Router id of CER1-1 : 92.168.96.23

Router id of CER1-4:  92.168.97.16

Only with CER1_1 to CER1_2 / CER2_1 to CER1_1 we have SR-TE LSP is up with PCE 

Now problem is SR-TE lsp is not coming up between CER1_1 to CER1_4 if we configure SR TE lsp with PCE.

Please note that Without PCE , SR-TE LSP is coming up between CER1_1 to CER1_4.

Kindly check this and provide your comment on this issue.

*A:CER1_1# show router mpls sr-te-lsp

===============================================================================
MPLS SR-TE LSPs (Originating)
===============================================================================
LSP Name Tun Protect Adm Opr
To Id Path
-------------------------------------------------------------------------------
CER1_1_to_CER1_4 3 N/A Up Dwn
92.168.97.16

Below are the configuration of OSPF and SR-TE LSP on CER1_1 and CER1_4 

*A:CER1_1>config>router>ospf# info
----------------------------------------------
router-id 92.168.96.23
no compatible-rfc1583
overload-include-stub
overload-on-boot timeout 800
traffic-engineering-options
sr-te legacy
exit
traffic-engineering
timers
incremental-spf-wait 0
lsa-accumulate 50
lsa-arrival 100
lsa-generate 5000 lsa-initial-wait 50 lsa-second-wait 200
spf-wait 5000 spf-initial-wait 50 spf-second-wait 200
exit
database-export identifier 0 bgp-ls-identifier 112
advertise-router-capability area
loopfree-alternates
ti-lfa max-sr-frr-labels 1
node-protect
exit
exit
segment-routing
prefix-sid-range global
maximum-sid-depth
override-bmi 2
exit
no shutdown
exit
area 0.0.0.0
interface "system"
interface-type broadcast
node-sid index 11
metric 1
no shutdown
exit
interface "to_CR2_1"
interface-type point-to-point
no shutdown
exit
interface "to_CR2_2_1"
interface-type point-to-point
no shutdown
exit
interface "to_CR2_2_2"
interface-type point-to-point
no shutdown
exit
interface "to_VSR-NRC"
interface-type point-to-point
no shutdown
exit
interface "to_CER1_2"
interface-type point-to-point
no shutdown
exit
exit
no shutdown

*A:CER1_4>config>router>ospf# info
----------------------------------------------
router-id 92.168.97.16
no compatible-rfc1583
overload-include-stub
overload-on-boot timeout 800
traffic-engineering-options
sr-te legacy
exit
traffic-engineering
timers
incremental-spf-wait 0
lsa-accumulate 50
lsa-arrival 100
lsa-generate 5000 lsa-initial-wait 50 lsa-second-wait 200
spf-wait 5000 spf-initial-wait 50 spf-second-wait 200
exit
advertise-router-capability area
loopfree-alternates
ti-lfa max-sr-frr-labels 1
node-protect
exit
exit
segment-routing
prefix-sid-range global
maximum-sid-depth
override-bmi 2
exit
no shutdown
exit
area 0.0.0.0
interface "system"
node-sid index 21
no shutdown
exit
interface "to_CR2_3"
interface-type point-to-point
no shutdown
exit
exit
no shutdown

*A:CER1_1>config>router>mpls# info
----------------------------------------------
interface "system"
no shutdown
exit
interface "to_CR2_1"
te-metric 1000
no shutdown
exit
interface "to_CR2_2_1"
no shutdown
exit
interface "to_CR2_2_2"
te-metric 100
no shutdown
exit
interface "to_CER1_2"
no shutdown
exit
path "pri"
no shutdown
exit
path "sec"
no shutdown
exit

lsp "CER1_1_to_CER1_4" sr-te
to 92.168.97.16
from 92.168.96.23
admin-tag "tag_broadband"
path-computation-method pce
pce-report enable
bfd
bfd-template "sbfd-template"
bfd-enable
failure-action failover-or-down
exit
path-profile 1 path-group 10
primary "pri"
priority 6 3
exit
secondary "sec"
standby
priority 4 3
exit
no shutdown
exit

 

 

Hi @mailatgk ,

Could you please open a new post. Using an existing post to ask a new questions makes it more difficult for everyone trying to find information.

Regards, 

Regards,
Harold Ritter, CCIE #4168 (EI, SP)