Configuring T1 CSU/DSU with PPP

Unanswered Question
May 26th, 2009

We recently subscribed to 2 T1 (PPP) ckts through a service provider and were provided with the static IP addresses and ecapsulation type (PPP). I have installed 2 T1 (CSU/DSU) modules but I need to ensure that I have the correct configurations on these modules. Could someone please assist me in providing me with what I need to configure on the interfaces?

Thanks in advance,

sK

I have this problem too.
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Collin Clark Tue, 05/26/2009 - 10:33

Can you post a show inventory so we can see what type of cards you have?

Richard Burts Tue, 05/26/2009 - 10:33

sK

The syntax of what you need to configure varies somewhat based on what platform you are configuring. If you would tell us what model of router this is and what cards they are we might be able to give more specific advice. In general the things that you need to have in the config would include clock source, timeslots, framing (usually esf), and linecode (usually b8zs), encapsulation ppp, and IP address and mask.

HTH

Rick

skhirbash Tue, 05/26/2009 - 14:56

Here is output of sho invt:

NAME: "2851 chassis", DESCR: "2851 chassis"

PID: CISCO2851 , VID: V04 , SN:

NAME: "WAN Interface Card - DSU/CSU T1 Fractional (V2)", DESCR: "WAN Interface Card - DSU/CSU T1 Fractional (V2)"

PID: WIC-1DSU-T1-V2 , VID: 1.2, SN:

NAME: "NME-XD-48ES-2S-P: EtherSwitch SM 48 10/100T PoE + 2 SFP", DESCR: "NME-XD-48ES-2S-P: EtherSwitch SM 48 10/100T PoE + 2 SFP"

PID: NME-XD-48ES-2S-P , VID: V01 , SN:

Thanks,

sK

Collin Clark Wed, 05/27/2009 - 05:20

Great, thanks. Your config will be straight forward since you don't have to configure the CSU/DSU.

<b><font size="2"></p><p>interface s0/0/0</p><p>no ip address</p><p>encapsulation ppp</p><p>multilink</p><p>ppp multilink group 2</p><p></p><p>interface s0/0/1</p><p>no ip address</p><p>encapsulation ppp</p><p>multilink</p><p>ppp multilink group 2</p><p></p><p>interface Multilink2</p><p> description MLPPP Link</p><p> ip address [YOUR IP] </p><p> ppp multilink</p><p> ppp multilink links maximum 4</p><p> ppp multilink group 2</p><p> ppp multilink fragment disable</p><p></b></font>

Hope that helps.

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