Question

Cisco 1841 and TG605s configurations

Asked by: mtarabay

Hi,
I have a MPLS IP-VPN circuit DSL/ATM as following into code partition.
My service provider send an email to me that i must use the following modem:
Thomson TG605s for connecting to the above circuit and using any cisco 1800 or 2800 sieres router, So i have Cisco 1841 router with FE0/0 and FE0/1 ports.
as my service provider connection illustration diagram i must connect FE0/0 to DSL modem and connect FE0/1 to my LAN switch then configure FE0/0 as WAN interface with IP=172.31.148.174/30
and i configure FE0/1 as LAN interface with my LAN IP node ex. 192.168.60.1/24
my two questions are:
when i configure TG605s as PPPoA it needs an IP address for DSL/ATM interface, then i have only one IP from my service provider please any suggestion for using and configuring this modem?

How can i configure my cisco 1841 BGP?

PVC number 1/311
interface ATM0/0.35 point-to-point 
description ATM0/0.35 atm pvc vpi=0 vci=35.By VPNSC: Job Id# = 23186
ip address 172.31.148.174 	255.255.255.252
pvc 0/35 encapsulation aal5snap
router bgp 64555 
neighbor 172.31.148.173 	remote-as 65000 
redistribute connected
metric 1
no auto-summary

                                  
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Asked On
2008-12-26 at 23:19:29ID24010621
Tags

DSL/ATM - MPLS circuit

Topics

Asyncronous Transfer Mode (ATM)

,

Miscellaneous Networking

,

Networking Hardware

,

Computer Modems

,

DSL Lines / Cable Internet

Participating Experts
1
Points
500
Comments
8

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Answers

 

by: giltjrPosted on 2009-01-01 at 07:54:25ID: 23275182

Unless either you missed something, or they missed giving you something, the outside interface (DSL/ATM) of the TG605 should be getting it IP address dynamically (DHCP) from the service provider.

Why do you want to configure BGP on the Cisco?  As your Cisco device is only connected to you LAN and the TG605, you should not need any dynamic routing protocols setup, static routes will be fine.  Further, if you only have one IP subnet on your LAN, all you would need is a single static route, the default route, pointing to the TG605.  

I am assuming you have something like:

   LAN <-- 192.168.60.0/24 --> (Fa0/1 - 1841 - Fa0/0) <-- 172.31.148.172.30 --> TG605 <-- DSL --> ISP

Unless you have more than one IP subnet within your network, you should only need one 1 route in the 1841 and that would be the default route pointing to 172.31.148.173.

 

by: mtarabayPosted on 2009-01-04 at 23:09:19ID: 23293509

Thanks qiltjr,
But i have other ATM circuits which must be connect with the above circuit through BGP. So i need to configure BGP into 1841 to find the same AS route into our MPLS.
If you can help me to configure BGP through Cisco IOS.

 

by: giltjrPosted on 2009-01-05 at 06:08:26ID: 23295372

I'm a bit confused down.

Is the DSL link connecting you to the Internet?  Or to a private network?

 

by: mtarabayPosted on 2009-01-06 at 21:42:14ID: 23312271

Dear qiltjr,
this is an ATM circuit over DSL lines it used not for Internet connection but for private network connection between remote sites.

 

by: giltjrPosted on 2009-01-07 at 05:24:43ID: 23314295

Ah, O.K.  I was thinking Internet.  Typically DSL connections are used for Internet access, not  "private" network connections.

However as to the BGP configuration.  

If the TG605 has the PPPoA connection defined to it, then the Cisco router would only be talking to it and thus it would need to distribute the routes to the TG605 only.  Unless you have other routers connected to the TG605.

Now, if the TG605 is acting as a "transparent bridge" and the Cisco router is doing the PPPoA connection, then you need to know the upstream IP address that it will distribute the routes to.

So, is the TG605 going to be doing the PPPoA, in other words it will be acting as a router between your Cisco router and the next upstream router, or will the TG605 be transparent?

20120131-EE-VQP-002

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