Multilink Bundles to Different Routers

[bret]

Hi, we are moving to different providers. We currently have multiple sites that have MLP bundles going to our current provider. We are trying to limit our network disruptions by creating a new MLP bundle group and connect it to the new provider, but are having no luck.

In a GNS3 lab I have setup I am able to keep my existing MLP bundle up/up over the current provider network. When I attempt to bring up a new MLP group to the other provider my MLP does not come up and keeps going up/up then down/down and shows inactive. Is it possible to have one MLP group go to current vendor router, then create another MLP group and go to the other router? This has been racking my brain!

All help is greatly appreciated!                 

[danielmcollins · Accepted solution]

Bret,

I threw this together in GNS and it worked.

interface Multilink1

ip address 10.1.1.1 255.255.255.252

ppp multilink

ppp multilink group 1

!

interface Multilink2

ip address 10.2.2.1 255.255.255.252

ppp multilink

ppp multilink group 2

!

interface Serial0/0

no ip address

encapsulation ppp

clock rate 2000000

ppp multilink

ppp multilink group 2

!

interface Serial0/1

no ip address

encapsulation ppp

clock rate 2000000

ppp multilink

ppp multilink group 1

!

interface Serial0/2

no ip address

encapsulation ppp

clock rate 2000000

ppp multilink

ppp multilink group 1

!

interface Serial0/3

no ip address

encapsulation ppp

clock rate 2000000

ppp multilink

ppp multilink group 2

interface Multilink1

ip address 10.1.1.1 255.255.255.252

ppp multilink

ppp multilink group 1

!

interface Multilink2

ip address 10.2.2.1 255.255.255.252

ppp multilink

ppp multilink group 2

!

interface Serial0/0

no ip address

encapsulation ppp

clock rate 2000000

ppp multilink

ppp multilink group 2

!

interface Serial0/1

no ip address

encapsulation ppp

clock rate 2000000

ppp multilink

ppp multilink group 1

!

interface Serial0/2

no ip address

encapsulation ppp

clock rate 2000000

ppp multilink

ppp multilink group 1

!

interface Serial0/3

no ip address

encapsulation ppp

clock rate 2000000

ppp multilink

ppp multilink group 2

hth,

Dan

[bret]

Is this router too router? Or this one router to two different routers. Ie R1 with a bundle going too R2 and R1 with a bundle going to R3.

LMK

Sent from Cisco Technical Support iPhone App

[danielmcollins]

Router 1 with a bundle to router2, and router 1 with a different bundle going to router3.

[danielmcollins]

I see the config paste came in messed up for some reason. It is the same thing pasted twice.

[bret]

The only thing different im doing is using ppp chap. I also started with a bundle going to R2. I shut down one link from that bundle maintaining my connectivity to R2. I created my second bundle on R1 and add the link from R2 to R3. Not sure if this plays into the equation. Your config is simple and if it worked, mabe I need to dumb down my config. If I shut down the bundle my s int goes up/up. Weirdness.

[bret]

You are correct this will work with 2 bundles going to different routers. I labbed it out and it worked for me. I found the problem and not sure yet how I am going to fix it.

Problem is R1 peers with our current vendor R2 using bundle 1 and routing with BGP. When I try and swing a link from R1 to our new vendor R3 using bundle 2 and routing BGP the link goes up and down. I guess I need to post another question for BGP.