Bonded T1 not working - Page 2

dtom · ‎08-29-2012

We are running two Cisco 3845 routers, one at our central office and one at a remote site. We bonded two T1's together and it worked fine (link 1 and link 2). We now want to add two more T1's and bond the four together but can't seem to get it to work. The original T1's still work fine (link 1 and link 2) but the new ones do not (link 3 and link 4). Here is our config does it look right?

***CENTRAL OFFICE***

!
card type t1 0 0
card type t1 0 1
card type t1 0 2
card type t1 0 3
card type t1 2 0
card type t1 2 1
!
network-clock-participate slot 2
network-clock-participate wic 0
network-clock-participate wic 1
network-clock-participate wic 2
network-clock-participate wic 3
network-clock-select 1 T1 0/2/0
network-clock-select 2 T1 0/2/1
network-clock-select 3 T1 0/3/0
network-clock-select 4 T1 0/0/0
!
controller T1 0/1/0
clock source internal
cablelength long 0db
channel-group 1 timeslots 1-24
!
controller T1 0/1/1
clock source internal
cablelength long 0db
channel-group 1 timeslots 1-24
!
controller T1 2/0
!
controller T1 2/0/0
clock source internal
cablelength long 0db
channel-group 1 timeslots 1-24
!
controller T1 2/0/1
clock source internal
cablelength long 0db
channel-group 1 timeslots 1-24
!
interface Multilink1
description Multilink Bundle
ip address 172.19.254.102 255.255.255.252
ppp multilink
ppp multilink group 1
service-policy output LAN-EDGE
!
interface Serial0/1/0:1
description T1 link 1
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
!
interface Serial0/1/1:1
description T1 link 2
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
!
interface Serial2/0/0:1
description T1 link 3
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
!
interface Serial2/0/1:1
description T1 link 4
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
!

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

sh ppp multilink

Multilink1
Bundle name: er-VANGPAO-TEMP
Remote Endpoint Discriminator: [1] er-VANGPAO-TEMP
Local Endpoint Discriminator: [1] vgectr01
Bundle up for 3d23h, total bandwidth 3072, load 16/255
Receive buffer limit 24000 bytes, frag timeout 1000 ms
    0/0 fragments/bytes in reassembly list
    153 lost fragments, 5819169 reordered
    142/39549 discarded fragments/bytes, 0 lost received
    0xB06B82 received sequence, 0xD182AD sent sequence
Member links: 2 active, 2 inactive (max not set, min not set)
    Se0/1/0:1, since 3d23h
    Se0/1/1:1, since 3d23h
    Se2/0/0:1 (inactive)
    Se2/0/1:1 (inactive)
No inactive multilink interfaces

***REMOTE SITE***

!
card type t1 0 0
card type t1 0 1
!
network-clock-participate wic 0
network-clock-participate wic 1
!
controller T1 0/0/0
framing esf
linecode b8zs
channel-group 0 timeslots 1-24
!
controller T1 0/0/1
framing esf
linecode b8zs
channel-group 0 timeslots 1-24
!
controller T1 0/1/0
framing esf
linecode b8zs
channel-group 0 timeslots 1-24
!
controller T1 0/1/1
framing esf
linecode b8zs
channel-group 0 timeslots 1-24
!
interface Multilink1
description Multilink Bundle to Ed Center (AT&T 3Mb)
ip address 172.19.254.101 255.255.255.252
ppp multilink
ppp multilink group 1
service-policy output LAN-EDGE
!
interface Serial0/0/0:0
description T1 line 1
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
!
interface Serial0/0/1:0
description T1 line 2
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
!
interface Serial0/1/0:0
description T1 line 3
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
!
interface Serial0/1/1:0
description T1 line 4
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1
!

xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

sh ppp multilink

Multilink1, bundle name is vgectr01
Endpoint discriminator is vgectr01
Bundle up for 3d23h, total bandwidth 3072, load 5/255
Receive buffer limit 24000 bytes, frag timeout 1000 ms
    0/0 fragments/bytes in reassembly list
    306 lost fragments, 6783707 reordered
    300/184999 discarded fragments/bytes, 0 lost received
    0xD18FEA received sequence, 0xB0775C sent sequence
Member links: 2 active, 2 inactive (max not set, min not set)
    Se0/0/1:0, since 3d23h
    Se0/0/0:0, since 3d23h
    Se0/1/0:0 (inactive)
    Se0/1/1:0 (inactive)
No inactive multilink interfaces

Jose Bogantes · ‎09-06-2012

Hi dtom,

Removing the "network-clock-participate wic x" command would bring the interface down. Sometimes the interfaces will go up by themselves but sometimes you will need to reload the router to force synchroniaztion. It is recommended to remove the command, save the configuration and reload the router:

no network-clock-participate wic x

wr mem

reload

We have to remember that this command might cause clocking issues in data T1s while it is a requisite for voice T1s.

Regarding the clock source, it is important to check with your provider to know if they are providing clocking somewhere in between.

You can also check the following link on clocking for a back-to back T1 circuit

http://www.cisco.com/en/US/tech/tk713/tk628/technologies_configuration_example09186a00800a6b82.shtml

The document is a kind of old but the concepts still work.

Regards,

mvsheik123 · ‎09-07-2012

"Altough common in the US, I have seen circuits that provide clock on both ends. Anywhere else in the world, clock is provided to both ends".

Hi Paolo- Thanks for sharing the info. Good to know.

Thx

MS