Anyone have a sample config for a 2811 with four T1 interfaces? 2

[texnut]

Hello,

We just recieved our new Cisco 2811 Router. The router is currently setup with IOS version 12.4(3h) & SDM version 2.4.

We have installed two VWIC2-2MFT-T1 cards into the unit (these are basically WIC cards that support two T1's each) ... for a total of four T1s.

Does anyone have a sample config showing how to setup the two cards and bond all four T1s such that they are essentially one large connection?

Thanks for any help in advance,

S

 

[brianinms]

Your provider would have to bundle them together for you in a multilink group. In addition are your connections point to point or frame relay?

 

[texnut]

Brianinms,

I just got off the phone with our ISP and they confirmed that we have four separate T1 lines using Frame Relay.

The default router that the ISP gave us is a Nortel Tazman 1004.

He says the bonding is being done at the router using Per-Flow balancing.

I've managed to setup a very basic configuration on the router however when my T1 cards show up as "Controller T1" rather than Serial connections so I have no idea how to setup the necessary IP information, circuit info etc.

Any thoughts?

 

[lerdalt]

You will have 2 pieces for the cards. The Controller T1 is the actual CSU to set the linecode and encoding, etc. Once you have the Controllers configured, you should see serial interfaces created. I'd guess something like:
Serial 0/0/0
Serial 0/0/1
Serial 0/1/0
Serial 0/1/1

Example:
controller T1 1/0/0
framing esf
linecode b8zs
cablelength long 0db
channel-group 0 timeslots 1-24
interface Serial1/0/0
bandwidth 1544
no ip address
no ip redirects
no ip proxy-arp
ip nat inside
encapsulation frame-relay IETF
ip route-cache flow
no snmp trap link-status
no fair-queue
frame-relay lmi-type ansi
frame-relay broadcast-queue 600 512000 72
hold-queue 200 in
hold-queue 75 out
Interface Serial1/0/0:0.1 point-to-point
bandwidth 1544
ip address 10.1.1.1 255.255.255.252
ip nat inside
frame-relay interface-dlci 17

 

[brianinms]

If you have 4 separate frame relay lines than all you can merely do is attempt to load balance across them. You wont be able to bond them together

 

[texnut]

Interesting - ok, so what I did, following lerdalt's advice, was create a channel-group 0 timeslots 1-24 speed 64 entry per Controller T1.

That created four serial interfaces (0/0/0 - 0/1/1).

Can I create a Multilink interface and add the four serial links into it at this point?

brianinms - how come I can't do it, if they are doing it with the generic router they give all their customers?

Thanks all!

 

[burtsbees]

He meant if they are four separate frame point-to-point connections, thus using four separate IP addresses, you cannot. If you need only one frame connection, then you can multilink them into a bonded 6MB pipe, but the ISP has to have a config that matches this in the frame switch, i.e. one point-to-point IP address...

Burt

 

[texnut]

Thanks for clearing that up Burt - on that point, yes, we have a block of IPs, but only one is assigned to the current default router that houses all four T1s.

So I believe that is along the same lines as what you're talking about.

Does anyone have some sample configs or perhaps a link to a cisco page with sample configs?

 

[burtsbees]

http://www.cisco.com/en/US/tech/tk713/tk507/tech_configuration_examples_list.html

controller E1 3/0
framing NO-CRC4
channel-group 0 timeslots 1-31
!
controller T1 3/1
framing NO-CRC4
channel-group 0 timeslots 1-24
!
interface Multilink1
ip address XXX.XXX.XXX.XXX 255.255.255.252
no cdp enable
ppp multilink
ppp multilink fragment disable
ppp multilink group 1
!
interface Serial3/0:0
bandwidth 2048
no ip address
encapsulation ppp
no cdp enable
ppp multilink
ppp multilink group 1
!
interface Serial3/1:0
no ip address
encapsulation ppp
no cdp enable
ppp multilink
ppp multilink group 1

That's with two bonded T1's, but you get the idea.

Burt

 

[texnut]

Fantastic, thanks Burt!

 

[burtsbees]

the first should be controller T1, not E1...sorry.

Burt

 

[texnut]

Yea, I caught that and figured it was a typo. Thanks for the clarification.