Unable to bring up T1

[robermuro]

Hello,

I'm trying to bring up two t1 and bundle them into a multilink on a 3845 on one end and a 3725 on the other end.  On the 3845 I have installed two VWIC-2MFT-T1-DI and on the 3725 I have installed two VWIC-2MFT-T1 and a 1DSU/CSU-T1-V2.

For some reason I'm able to bring up the T1's on the DSU/CSU WIC.  When I try to connect the T1 on the other WICs, on the 3845 I see SLIPs and Interface Resets however on the 3725 there is no errors however I still see UP DOWN.

CONFIG 3845

controller T1 2/0/0

framing esf

linecode b8zs

cablelength short 133

channel-group 0 timeslots 1-24 speed 64

!

interface Serial2/0/0:0

ip address 1.1.1.1 255.255.255.0

no keepalive

!

CONFIG 3725

controller T1 0/1

framing esf

clock source internal

linecode b8zs

cablelength short 133

channel-group 0 timeslots 1-24 speed 64

!

interface Serial0/1:0

ip address 1.1.1.2 255.255.255.0

no keepalive

!

#CONFIG FOR CSU/DSU WIC ON 3725 ROUTER

interface Serial0/2

ip address 2.1.1.2 255.255.255.0

encapsulation ppp

service-module t1 clock source internal

service-module t1 timeslots 1-24

!

Thanks in advanced for any help you can provide me with

Robert Muro.

[vmiller · Accepted solution]

Assuming this is a circuit provided by a carrier, change your timing to network.

[robermuro]

Thanks never ocurred to me to try both as line.  I was always trying either line/source source/line with and without network-clock-participate.

What I did was:

1. On both routers removed clock source
   
2. On both routers added the network-clock-participate
   
3. On both routers added keepalive 3.
   

Now the config looks

CONFIG 3845

network-clock-participate slot 2

!

controller T1 2/0/0

framing esf

linecode b8zs

cablelength short 133

channel-group 0 timeslots 1-24 speed 64

!

interface Serial2/0/0:0

no ip address

encapsulation ppp

no ip route-cache cef

no ip route-cache

keepalive 10 3

no fair-queue

ppp multilink

ppp multilink group 9

!

CONFIG 3725

network-clock-participate wic 1

!

controller T1 0/1

framing esf

linecode b8zs

cablelength short 133

channel-group 0 timeslots 1-24 speed 64

!

interface Serial0/1:0

no ip address

encapsulation ppp

no ip route-cache cef

no ip route-cache

keepalive 10 3

no fair-queue

ppp multilink

ppp multilink group 9

!