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Bonding T1 Circuits w/ Cisco Router.  Question regarding Segmenting traffic?

Posted on 2007-12-04
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Last Modified: 2010-05-19
Hello.  We currently have 1 point-to-point T1 between location A and B.  We plan to add a 2nd point-to-point T1, from the same provider, between these locations.  We want to bond the circuits with new hardware.  We plan to purchase new Cisco routers.  These circuits will be used for Voice and Data traffic.  Can we bond the ciruits, yet still allow, through the router configuration, the Voice traffic to be segmented to a portion of 1 of the T1s?  If so, what model router is recommended (we were thinking 2801) and what wics or vwics are needed?  

We would like to bond the circuits, probably via MLPPP at the router level, to get the combined throughput of both circuits, yet have a portion of one circuit designated for voice and apply our priorities for voice to this portion.  Thanks in advance.

-asmcbride
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Question by:shockey
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9 Comments
 
LVL 79

Expert Comment

by:lrmoore
ID: 20408182
Not really. When you bond the 2 circuits, you can't then go back and say voice traffic goes over link1 and data over link2. You would have to keep them separate links to do that.
You can always set QoS limits to dedicate a certain amount for Voice and for data.
If you keep the two separate, then you can easily send all voice over one link and all data over the other.
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Author Comment

by:shockey
ID: 20464280
We definitely want to bond the (2) circuits for the additional bandwidth, as we do not want to dedicate an entire circuit or an entire circuits worth of bandwidth to voice.  Do you know if a Cisco 2801 will be adequate for this task?  Can we install standard T1 CSU/DSU wics if bonding them?  thanks.
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LVL 79

Expert Comment

by:lrmoore
ID: 20467960
I would go with a 2811 and version2 T1 CSU/DSU WIC's or dual-port VWIC
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Author Comment

by:shockey
ID: 20494464
if this new bonded circuit is going to share voice and data, what is the best recommendation for prioritizing and/or splitting?  Currently with the single T1 we use a priority group and a priority list for the voice traffic.  If we bond the circuits via MLPPP can we still use priority groups/lists?  I've read that QOS can't be used if doing MLPPP.  I'm looking for the best recommendation solution, or at least some links to readings that will better explain available options.  Thanks.
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LVL 79

Expert Comment

by:lrmoore
ID: 20495223
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Author Comment

by:shockey
ID: 20502045
Are there any advantages to using the standard version2 T1 CSU/DSU WIC's vs. the vwics?  Reading indicates that when using the vwics you configure the controller to bond the serials.  Is there a recommended 'best way' to bond them?  Does one option offer advantages over the other?
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Accepted Solution

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lrmoore earned 175 total points
ID: 20502872
In pure data environment (and VoIP is pure data), I don't know of any advantage of the Multiflex Trunk VWIC module over the standard WIC-DSUv2, although It does come in a dual port module that gives you and you can get a version with "drop and insert" capability to combine true voice and data on the same physical T1. The Multiflex module lets you set it as either a T1 or E1 as needed which is handy to have a consistent part number for both US and overseas offices.
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Author Comment

by:shockey
ID: 21088631
I'm about to start testing this new bonded solution on a pair of new point to point T1s.  I've been doing some reading from the links you provided above and now have some addtional questions.  Currently, based on research from this site, a section of my config looks like this:

interface Multilink1
 ip address 192.168.3.6 255.255.255.0
 ppp multilink
 ppp multilink group 1
!
!
interface Serial0/1/0
 no ip address
 encapsulation ppp
 ppp multilink
 ppp multilink group 1
!
interface Serial0/0/0
 no ip address
 encapsulation ppp
 ppp multilink
 ppp multilink group 1

After reading from links above, I'm curious if I need to apply traffic classes or traffic policies to this multilink.  I haven't heard this prequisite before and didnt read about it on any other posts regarding bonding circuits via mlppp.  I'm also unlcear on whether I need to use/define the fragment, interleave and multiclass statements associated with the multilink?  Any help or clarification is greatly appreciated.


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LVL 79

Expert Comment

by:lrmoore
ID: 21090399
I would not start out with any QoS features enabled with any policing policies unless and until you find that you need them.
Config looks clean. Simple is best.
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