Bonding two T1s

PPP multilink

Right, I got that part. What I'm trying to figure out is how the configuration should be done. Cisco's site shows a couple of configurations, but they don't comment them enough for me to be able to determine whether or not they're what I need.

hmmm, I've forgotten how to do it. I'll have a go now and see if I can get it working, if I do I'll post my config.

Thanks Phil, I appreciate it.

Jim

hmmm

I see what you mean about no IP address. The example seems to be using briding, not quite sure if that's the only way it can be done. I don't think so really.

I don't have too much of a problem with it bridging I suppose. I'm more interested in throughput. We have three remote servers there and full BUs have become a W/E long nightmare.

That link is a better example than I'd found so far.

One odd thing on the example. Notice that there's a ppp multi statement on the "shutdown" isdn int? Seems unnecessary.

i know this is a cop-out, but why did you decided to load balance this way rather than through the routing protocol?

We don't want to load balance, but rather bond them for an improved aggregate throughput. As we understand it (and we may be nuts) bonding the Ts in this manner will not load balance them but logically combine them as a single pipe.

I have found that multilink PPP does load ballance better than a routing protocol will, up to about 3 T1's. Maybe I'm an idiot though.

Here's my config (using VWIC-2MFT-T1 card)

interface Multilink1 ip address 192.168.250.a 255.255.255.252 ppp multilink ppp multilink group 1

interface Serial0/0:0 no ip address encapsulation ppp ppp multilink ppp multilink group 1

interface Serial0/1:0 no ip address encapsulation ppp ppp multilink ppp multilink group 1

of course with this card you have to configure the controller...

controller T1 0/0 framing esf crc-threshold 320 clock source internal linecode b8zs channel-group 0 timeslots 1-24 speed 64 ! controller T1 0/1 framing esf crc-threshold 320 clock source internal linecode b8zs channel-group 0 timeslots 1-24 speed 64

The physical layer config may vary depending on your hardware (WIC-1DSU-T1, WIC-1T, etc.).

thanks for filling me in on the config. I've read similair things about throughput being better with PPP. Would be interested to here how much better.

int multilink 1 ip add 1.1.1.1 255.255.255.0 encapsulation ppp multilink-group 1 int s0/0 encapsulation ppp multilink-group 1 int s0/1 encapsulation ppp multilink-group 1

Jonathan

Hi gents,

Thanks for all the feedback. I think I've got it now.

Jim

Hi folks,

Just got back from putting up the link. Went smooth as silk. Again, thanks for all the help.

Jim