I am using back to back Cisco 2941s (mwr2941-adviprank9-mz.151-3.MRA3) in the lab to attempt to establish a pseudowire circuit for T1 delivery. I am trying to establish timing by using adaptive clock recovery (ACR) in-band master/slave mode with the master being clocked with a BITS source. This is listed as supported in the 2941 documentation
the pseudowire is established as satop with udp encapsulation like so (single config shown for brevity):
controller T1 0/3
clock source internal
linecode b8zs
cablelength long 0db
cem-group 0 unframed
interface CEM0/3
no ip address
cem 0
xconnect 192.168.1.33 199 pw-class pw-udp
udp port local 49152 remote 49152
pseudowire-class pw-udp
encapsulation udp
ip local interface Vlan199
ip tos value 100
ip ttl 100
interface Vlan199
description "PWE network"
ip address 192.168.1.34 255.255.255.0
no ptp enable
end
Everything pertaining to the xconnect and cem is working as expected:
2941-pwLab-1#sh pw-udp vc
Local intf Local circuit VC ID Status
----------------- -------------------------- ---------- ---------------
CE0/3:0 SATOP T1 199 established
LAddr: 192.168.1.34 LPort: 49152
RAddr: 192.168.1.33 RPort: 49152
2941-pwLab-1#sh xconnect all
Legend: XC ST=Xconnect State S1=Segment1 State S2=Segment2 State
UP=Up DN=Down AD=Admin Down IA=Inactive
SB=Standby HS=Hot Standby RV=Recovering NH=No Hardware
XC ST Segment 1 S1 Segment 2 S2
------+---------------------------------+--+---------------------------------+--
UP ac CE0/3:0(SATOP T1) UP udp 192.168.1.33:199 UP
2941-pwLab-1#sh cem circuit
CEM Int. ID Ctrlr Admin Circuit AC
--------------------------------------------------------------
CEM0/3 0 UP UP Active UP
However with the following network-clock config, i am unable to get timing over the pseudowire:
LAB 1 with wired BITS:
controller BITS
applique T1
framing esf
network-clock-select hold-timeout infinite
network-clock-select mode nonrevert
network-clock-select 1 BITS
LAB 2 with ACR
recovered-clock recovered adaptive cem 0 3 0
network-clock-select hold-timeout 900
network-clock-select mode nonrevert
network-clock-select 1 PACKET-TIMING
I am trying to determine why my lab 2 device remains in free-run, and changing encapsulation to MPLS or CESoPSN has not had any effect. In wireshark I can see SAToP packets but am unable to decode RTP for timing due to lack of support in wireshark, guidance on verifying timing manually would also be appreciated.
