Configuring channelized E1

[Adrian Caba Gutierrez]

Hello, I have a router 3825 with a card VWIC2-2MFT-T1/E1 and I need to configure two E1 links, but I need configure port-channelized E1 to put three links of 1 Mbps. How I can configure the E1 links I am confused in how split the time slots.

Thanks      

[paolo bevilacqua]

Get first the exact number of timeslots from telco.

[Adrian Caba Gutierrez]

Hello, the timeslots are from 1 to 31, the interface card E1 have one interface already configured with six channelized links I need how would be the process of erase the configuration of this channelized port, make the new configuration of 1 Mbps every one and make the configuration of the new port with only one link of 1 Mbps.

The distribution of links is:

E1 0/0/1 ------ two links of 1 Mbps every link

E1 0/1/0 ------ one link of 1 Mbps

Thanks.

[Jose Bogantes · Accepted solution]

Hello Adrian,

If they mentioned you need to configured timeslots 1-31, it means that it is a standard E1:

controller E1 1/0

channel-group 0 timeslots 1-31

However, there is an important detail you need to confirm: is this a voice or data circuit?

Now, if this were a regular data E1 and if you would need to remove the configuration from the already configured E1, just check the controller E1 configuration (show run | beg controller E1) and use 'no' before the 'channel-group x timeslots' command:

controller E1 1/0

no channel-group 0 timeslots 1-16

Once this is done, you can add the proper timeslot pattern:

controller E1 1/0

channel-group 0 timeslots 1-31

You can use this link if you need further details on E1 onfiguration:

http://www.cisco.com/en/US/docs/routers/access/1700/1721/software/feature/guide/t1e11721.html

Regards.

[paolo bevilacqua]

If you have 1 Mbps circuit you will need to configure timeslots 1-16, but confirm that again with telco, as it is not very common.

[Adrian Caba Gutierrez]

Hello, my links are standard E1 so I have timeslots from 1-31, these E1 are only for data. I will make the process that you say with the "no" of channel-group command. The configuration that I think to make is:

controller E1 0/1/0

framing NO-CRC4

clock source internal

channel-group 1 timeslots 1-16

channel-group 2 timeslots 17-31

controller E1 0/1/1

framing NO-CRC4

clock source internal

channel-group 3 timeslots 1-16

interface Serial0/1/0:1

no ip address

encapsulation ppp

load-interval 30

ppp multilink

ppp multilink group 1

!

interface Serial0/1/0:2

no ip address

encapsulation ppp

load-interval 30

ppp multilink

ppp multilink group 2

interface Serial0/1/1:3

no ip address

encapsulation ppp

ppp multilink

ppp multilink group 3

interface Multilink1

ip address 172.20.10.29 255.255.255.252

ip virtual-reassembly

ppp multilink

ppp multilink fragment delay 10

ppp multilink interleave

ppp multilink group 1

ip rtp header-compression iphc-format

!        

interface Multilink2

ip address 172.20.10.25 255.255.255.252

ip virtual-reassembly

ppp multilink

ppp multilink fragment delay 10

ppp multilink interleave

ppp multilink group 2

!        

interface Multilink3

ip address 172.20.10.49 255.255.255.252

ip virtual-reassembly

ppp multilink

ppp multilink fragment delay 10

ppp multilink interleave

ppp multilink group 3

I am not sure if this configuration is correct, thanks for the help.

[paolo bevilacqua]

You should have only one multlink group, not three.

[Adrian Caba Gutierrez]

I need three WAN links and intend have my two E1 channelized to have three WAN links.

[paolo bevilacqua]

Then you don't need multilink PPP and in fact, if the other side is a Cisco router. you don't even need PPP.

[Adrian Caba Gutierrez]

Yes the other side is a Cisco router for all links. How could be the configuration please if in the branches I have satelital serial links but in the HQ I have these two E1s.

Thanks for the help.

[paolo bevilacqua · Accepted solution]

With IP address under serial interface, and no PPP.

[Adrian Caba Gutierrez]

In the HQ I will have two E1 links to configure with three branches, in the other side there is a router Cisco with serial links to connect with the HQ. Can I configure this links with serial interfaces?

Thanks.

[paolo bevilacqua]

Yes, as answered above already.

[Adrian Caba Gutierrez]

Thanks for the help, it was very rewarding to me.

[paolo bevilacqua]

Thank you for the nice rating and good luck!