STM1 Back-to-Back Between ASR 9006 and ASR 903

[ser3oof007]

Dear Gents,

Seeking your usual support to aid me to connect STM1 Back-to-Back between ASR 9006 and ASR 903.

I have ASR 9006 comes with SPA-4XOC3-POS-V2 and SFP-OC3-MM using XR-A9K-PXK9-04.03 IOS-XR.

Also I have ASR 903 comes with A900-IMA4OS interface module with ONS-SI-155-SR-MM SFP using SASR903R1NPEK9-38S IOS-XE.

I'm using Multi Mode fiber cable between them and the interfaces never came UP UP.

Below the configuration i did to both sides.

ASR 903 configuration:

ASR903#sh run | sec contro
controller SONET 0/0/0
 framing sdh
 clock source internal
 aug mapping au-4
 !
 au-4 1 pos

!

interfaces POS0/0/0.1  

ip address 10.10.10.2 255.255.255.252

ASR 9006 configuration

ASR9006#sh running-config controller soNET 0/1/0/0  
controller SONET0/1/0/0
 framing sdh
 clock source internal
!
interface POS0/1/0/0
 ipv4 address 10.10.10.1 255.255.255.252

Thanks in advance.
 

[xthuijs]

I think your 900 is running in an oc12/stm4 mode (as you seem to subrate the sonet controller), so they have a speed mismatch already although it looks like you're using the right STM1 optic.

also one side you will want to have use clock from line while the other internal, otherwise you'll get a lot of clock slips.

cheers

xander

[Orestis Iordanidis]

Change clocking on one side to line (default), check scrambling settings on both ends, maybe you need to disable scrambling on ASR 9006 controller (different defaults) and check for CRC settings (ASR 903 is using crc 16 while ASR 9006 uses crc 32). It worked in our lab with both single and multimode fibers:

ASR 9006 (running 5.3.1), SPA-8XOC3-POS, SFP-OC3-IR1:

!

controller SONET0/3/2/0
 path
  report pais
  report prdi
  scrambling disable
 !
 framing sdh
 report lais
 report lrdi
 report sd-ber
 overhead s1s0 2
 clock source line
!

!
interface POS0/3/2/0
 ipv4 address 10.255.255.1 255.255.255.252
!

ASR 903: (running 3.13) A900-IMA4OS, ONS-SI-155-I1:

!

controller SONET 0/3/0
 alarm-report BER_SD
 alarm-report LRDI
 alarm-report LAIS
 framing sdh
 clock source internal
 aug mapping au-4
 !
 au-4 1 pos
!

!         
interface POS0/3/0.1
 ip address 10.255.255.2 255.255.255.252
 crc 32
!

HTH

orestis