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SETUP T1 SERVICE

Posted on 2007-04-01
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Last Modified: 2010-04-17
Can someone please tell me how to configure a CSU/DSU T1 for a 3845 Router? For example if I wanted to configure it to work with Verizon's T1 service. Do I need to set the clock source to internal or line, the spokes which are 2600 Routers. The 3845 Router is the hub.

Thank You
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Question by:vreyesii
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by:lrmoore
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What type T1 service are you getting? MPLS? Frame-relay? Point-to-point? Internet?
Did they provide any information like example configs?
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by:vreyesii
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I did not get any example configs. The 3845 will be connecting to the four remote sites.
                                                     
                                                     Site 4
                                                         |      
                                Site 3  -- - -- - -HUB(3845)-------- Site 1
                                                         |
                                                      Site 2
 
From the HUB there would be point-to-point connection to the sites.

Thank You

           
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lrmoore earned 500 total points
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If it is point to point, then generally you get to make your own decisions as to encapsulation (HDLC vs PPP), IP addressing, routing, etc. You need to ask Verizon is they provide line clocking. Generally they do not on p-2-p links.
All you really need to do is provide line clock on one end, suggest the hub site for all others. This example uses default HDLC encapsulation and all default configuration of the DSU with the exception of the clock source. If you do not specify, then the default is clock source line which is what you want for the remotes:

interface serial 0/0/0
 descript Site 1
 ip add 1.2.3.1 255.255.255.252
 service-module t1 clock source internal

Site1:
 interface serial 0/0/0
 descript P2P to Hub
 ip add 1.2.3.2 255.255.255.252

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by:vreyesii
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So the serial ports in the hub site must have the "service-module t1 clock source internal" configured? Also in the hub site do I have to the configure the timeslots? On the sites I do not have to configure the clock source or the timeslots.

Thank You
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by:lrmoore
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default timeslot setting is all 24 channels. Only need to set them if you have less than full T1.
If you configure the clock source internal on the hub site, no clock source settings required on remotes. They will default to clock source line.
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by:vreyesii
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Ok I configured below is the config for the HUB site and one of the remote sites. When I look at the status of the interface on both routers it states the that link is down. What am I missing in the configuration?

Thank You

HUB Site

controller T1 0/0/0
 framing esf
 clock source internal
 linecode b8zs
 channel-group 0 timeslots 1-24
!
controller T1 0/0/1
 framing esf
 linecode b8zs
 channel-group 1 timeslots 1-24
!
controller T1 0/1/0
 framing esf
 linecode b8zs
 channel-group 1 timeslots 1-24
!
controller T1 0/1/1
 framing esf
 linecode b8zs
 channel-group 1 timeslots 1-24
!
!
interface GigabitEthernet0/0
 ip address 143.104.179.239 255.255.255.0
 duplex auto
 speed auto
 media-type rj45
 negotiation auto
!
interface GigabitEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
 media-type rj45
 negotiation auto
!
interface Serial0/0/0:0
 ip address 2.2.2.1 255.255.255.252
!
interface Serial0/0/1:1
 ip address 2.2.3.1 255.255.255.252
!
interface Serial0/1/0:1
 ip address 2.2.4.1 255.255.255.252
!
interface Serial0/1/1:1
 ip address 2.2.5.1 255.255.255.252
!
ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0

Remote Site

interface Serial0/1
  ip address 2.2.2.2 255.255.255.252
 service-module t1 timeslots 1-24
end
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by:lrmoore
Comment Utility
can you post result of "sho ip int brief"
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Author Comment

by:vreyesii
Comment Utility
HUB Site

Interface                  IP-Address      OK? Method Status                Protocol
GigabitEthernet0/0         143.104.179.239 YES manual up                    up
GigabitEthernet0/1         unassigned      YES NVRAM  administratively down down
Serial0/0/0:0              2.2.2.1         YES manual down                  down
Serial0/0/1:1              2.2.3.1         YES NVRAM  down                  down
Serial0/1/0:1              2.2.4.1         YES NVRAM  down                  down
Serial0/1/1:1              2.2.5.1         YES NVRAM  down                  down

Remote Site

Archer#
Archer#sh ip int brief
Interface                  IP-Address      OK? Method Status                Protocol
FastEthernet0/0            172.22.175.193  YES NVRAM  up                    up
Serial0/0                  unassigned      YES NVRAM  up                    up
Serial0/0.1                172.22.4.90     YES NVRAM  down                  down
Serial0/0.2                172.22.4.42     YES NVRAM  up                    up
Serial0/1                  2.2.2.2         YES NVRAM  down                  down
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by:lrmoore
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Hmm...
Are you sure the Telco has "turned on" the T1's ?

>ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0
FYI, you should never point a default out an Ethernet interface. Use the next-hop IP address
ip route 0.0.0.0 0.0.0.0 143.104.179.xxx
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by:vreyesii
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I believe that the Telco has turned on the T1 is there a way I can find out if they were turned on?

Thank You
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by:lrmoore
Comment Utility
Call the telco is about the only way.
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Author Comment

by:vreyesii
Comment Utility
Does the configuration for the hub site and the remote sites look fine? For example can I use the configuration from "controller T1 0/0/0" for the other controllers. And use the configuration from the remote site interface for the other remote sites?

Thank You

HUB Site

controller T1 0/0/0
 framing esf
 clock source internal
 linecode b8zs
 channel-group 0 timeslots 1-24
!
controller T1 0/0/1
 framing esf
 linecode b8zs
 channel-group 1 timeslots 1-24
!
controller T1 0/1/0
 framing esf
 linecode b8zs
 channel-group 1 timeslots 1-24
!
controller T1 0/1/1
 framing esf
 linecode b8zs
 channel-group 1 timeslots 1-24
!
!
interface GigabitEthernet0/0
 ip address 143.104.179.239 255.255.255.0
 duplex auto
 speed auto
 media-type rj45
 negotiation auto
!
interface GigabitEthernet0/1
 no ip address
 shutdown
 duplex auto
 speed auto
 media-type rj45
 negotiation auto
!
interface Serial0/0/0:0
 ip address 2.2.2.1 255.255.255.252
!
interface Serial0/0/1:1
 ip address 2.2.3.1 255.255.255.252
!
interface Serial0/1/0:1
 ip address 2.2.4.1 255.255.255.252
!
interface Serial0/1/1:1
 ip address 2.2.5.1 255.255.255.252
!
ip route 0.0.0.0 0.0.0.0 GigabitEthernet0/0

Remote Site

interface Serial0/1
  ip address 2.2.2.2 255.255.255.252
 service-module t1 timeslots 1-24
end

Hub Site

controller T1 0/0/0
 framing esf
 clock source internal
 linecode b8zs
 channel-group 0 timeslots 1-24

Remote Site

interface Serial0/1
  ip address 2.2.2.2 255.255.255.252
 service-module t1 timeslots 1-24
end
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Expert Comment

by:lrmoore
Comment Utility
Yes, your configuration looks fine and should work fine.
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Author Comment

by:vreyesii
Comment Utility
You were correct lrmoore the T1 circuit was not up. All the T1's are up now.


Thank you for all your help.
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