Need to bond 3 T1 connections

Posted on 2008-06-20
Last Modified: 2012-06-21
Currently we're using a Cisco 2611 with 2 T1-WIC cards. This router is running bonded T1s using HDLC and load balancing per-packet across these interfaces. We've added a 3rd T1 to the mix and since the Cisco cannot physically handle the 3rd T1 we purchased an HP Secure Router 7102dl with 2 dual port T1 cards.

What I am not able to figure out is how to setup the HP to bond the 3 T1s to get the full 4.5Mb speeds. I've asked Hp and they said this:

"If you plan to use HDLC, please note that multi-links are not supported.  The HDLC protocol will be bonded to individual T1 interfaces.  These individual interfaces are understood to provide a connection to different routers."

Then, my ISP said this:

"I believe they're just stating they do not support load-balancing with HDLC.  You need to inquire as to load balancing per-packet across these interfaces, which should be completely independent of the actual layer2 protocol being used."

Is there anyone out there who can help me get this router setup properly?
Question by:jasonsfa98
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Accepted Solution

kanlue earned 500 total points
ID: 21835616
Hi Jasonsfa98,

in order to bond multi-links, you can use MLPPP or MLFR.
i have 3xT1 connecting to my cisco 2821, with two VWIC-2MFT-T1, getting total 4.5Mbps from AT&T, using the MLFR. it's working perfectly.

so in your case, i would suggest you to check with your isp to switch to MLPPP or MLFR.
and HP 7102dl does support both of them very well.
and here is a sample configuration of MLPPP on hp 7102dl:
hostname "samplesetup"
no enable password
ip subnet-zero
ip classless
ip routing
event-history on
no logging forwarding
no logging email
logging email priority-level info
interface eth 0/1
ip address
no shutdown
interface eth 0/2
no ip address
interface t1 1/1
clock source internal
tdm-group 1 timeslots 1-24 speed 64
no shutdown
interface t1 1/2
clock source internal
tdm-group 2 timeslots 1-24 speed 64
no shutdown
interface ppp 1
ip address
ppp multilink
no shutdown
bind 1 t1 1/1 1 ppp 1
bind 2 t1 1/2 2 ppp 1
ip route
no ip tftp server
no ip http server
no ip http secure-server
no ip snmp agent
no ip ftp agent
line con 0
no login
line telnet 0 4

hope it helps.


Author Comment

ID: 21867603
Well my ISP only does HDLC so I am pretty much SOL.

Your information would help someone that has an ISP willing to do PPP so here are your points!

Expert Comment

ID: 21868109
Thank you!

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