subinterfaces

[MyHeadHurts]

I would like to use a 3620 (12.0 IP Plus) to create muliple PPP connections coming in on a single T1...ie channels 1-4 would be a 256K PPP......5-8 another 256K doing PPP..etc. Now I've done subinterfaces when doing Frame and ATM, but I have never seen (nor know what module actually supports) doing individual PPP connections on a FRAC T1. I attempted to use a WIC-1DSU-T1 and do subs off that, but I take it now that I tried, that even if your using it as a FRAC T1, this module only supports one port/PPP connection. I was hoping I could make subs and tell it what channels to use for each sub. Is there a way to do this in the 3620 that I have, and if so what modules can I utilize to do this, as well as a link to Cisco docs showing a sample config? Thanks in advance.

 

[BuckWeet]

You need a VWIC-1MFT-T1 card to do this. It sounds like you wan to channelize the T1. To do this you need a card that can do this, which is what the MultiFlex trunk card does. The standard WIC module like you have is just for a basic T1 app, and cannot channelize.

So when you get this card you would do this

controller t1 1/0
channel-group 1 timeslots 1-4 speed 64
channel-group 2 timeslots 5-8 speed 64
channel-group 3 timeslots ... speed 64

interface serial 1/0:1
encapsulation ppp
ip address whatever

interface serial 1/0:2
encapsulation ppp
ip address whatever

interface serial 1/0:3
encapsulation ppp
ip address whatever


Hope this helps

BuckWeet

 

[l1carter]

Buckweet is 100% correct. What you are wanting is a channelized T1 module. Then and only then you will be able to get to the DS0 level like you want. Then you will notice it's not sub interfaces rather :x interfaces. What i mean is...

channel-group 1 timeslots 1-4 speed 64
--use DS0's 1-4 at a data rate of 64k per channel. (they MUST be contigious like that also)

once you enter that command you will see a new interface on your router

interface serial x/y:1 <-- the 1 came from your channel-group 1 command earlier.

 

[MyHeadHurts]

Thanks for the info! That's exactly what I need to do. I knew I could do this also with a 4 port serial V.35 and a channel bank I have that would do the serialization out to individual V.35's, but wanted to cut down on the cabling as you might have guessed. Thanks again. I'll look into that module.

 

[rcasta]

Can the same thing be done when using Frame Relay? I mean, instead of creating subinterfaces, using a channelized E3 (is there one?) or E1 line and separate each one as shown earlier by debugall and MyheadHurts.

Best regards,

 

[BuckWeet]

You don't need to channelize with frame relay. Frame is designed for one big pipe going into the headend, and has logical VC's on the circuit to give you that multiple link sense. Yes there is a channelize E3..


BuckWeet

 

[plshlpme]

hey guys this thread was very good for my application..
worked like a treat on my 1721. thanks