Cisco 2620 / Bonding T-1's

[NGRyanSA]

Hi All,

I've been reading through some forums about bonding t-1's on a cisco router, and have tried some configurations.
Im pretty novice when it comes to cisco, but I can do basic navigation and configuration.

We recently have gotten one communications and got talked into getting a bonded T-1 for 3 meg connection. But once all was said and done, they offered no help with configuration of our router, so Im kinda stuck. Is there someone who can help me by giving me a configuration example and how/where to plug in the ip's.

These are just example IP's.

1st Pipe
WAN IP - 64.65.202.50
LAN IP - 25.10.10.1
DATA PVC - 14/601

USABLE IP 25.10.10.3-25.10.10.10
SUBNET 255.255.255.255
GATEWAY 25.10.10.2

2nd Pipe
WAN IP - 64.65.202.60
LAN IP 25.10.10.11
DATA PVC - 14/602

USABLE IP 25.10.10.13-25.10.10.20
SUBNET 255.255.255.255
GATEWAY 25.10.10.12

Am I missing any information, or need to ask someone for more. I'm lost, and any help would be greatly appriciated!

 

[NGRyanSA]

Oh, I forgot to say that I do have (2) Serial CSU/DSU's and one FastEthernet Port On the router.

 

[adamc1115]

interface serial0/0
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1

interface serial0/1
no ip address
encapsulation ppp
ppp multilink
ppp multilink group 1

interface Multilink1
ip address 64.65.202.50 255.255.255.252
ppp multilink
ppp multilink fragment disable
ppp multilink group 1


If they are bonded their shouldn't be seperate IP's for each T1, they should be one virtual circuit. Are you sure they are bonded??

 

[bbillings]

adamc1115 is right, you should only have 1 IP address if they are bonded together. Here's what I did for our bonded T1 line (Both T1 lines tie into a VWIC-2MFT-T1 module in our 2600):

<Note: Your controller config may need to be changed, you'll need to talk to your ISP to find out what you need>

controller T1 0/0
framing esf
linecode b8zs
channel-group 1 timeslots 1-24 speed 64
!
controller T1 0/1
framing esf
linecode b8zs
channel-group 1 timeslots 1-24 speed 64
!
!
interface Multilink1
ip unnumbered Ethernet0/0
no ip redirects
no ip mroute-cache
no cdp enable
ppp multilink
ppp multilink fragment disable
ppp multilink group 1
!
interface Ethernet0/0
ip address <ISP provided IP> <Subnet for IP address>

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


Hope that helps!

 

[burtsbees]

I would like to add, though many know this, that when one uses the word "l i n k", even as part of another word, like m u l t i l i n k, in this forum, it creates an actual link to
A t t a c h m a t e solution l i n k s...

Burt