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Setting up MPPP + QOS on Cisco IOS 12.4  router

Posted on 2013-05-17
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Last Modified: 2013-05-20
Hi,
I have an existing point-to-point T1 which is set up with QOS for a specific group of servers (as T1 % bandwidth). We will be adding a 2nd T1 with a plan to bond together.

Questions;
1) MPPP
It appears that the existing serial interface is set for HDLC (no reference otherwise - see below). I understand we need to set both ends up for PPP encapsulation to configure MPPP(correct?).
Would this simply require the following configs for MPPP (each T1 serial interface, both routers)?
- encapsulation ppp
- ppp multilink
- multilink group 1
- no ip address

I understand that an MPPP interface has to be configured on each router (ie ip address, ppp multilink, multilink-group 1) - this is outside of the scope of the question at this point.

2) QOS
Once MPPP is configured, would QOS be configured by applying the service-policy output to the MPPP interface or would it be applied to each T1 individually?


Following is a copy of one of our existing T1 serial Interfaces for your reference. Advice is much appreciated.

interface Serial0/0/0
 description T1 to Remote site
 bandwidth 1544
 ip address 10.10.10.245 255.255.255.252
 no ip redirects
 no ip unreachables
 ip flow ingress
 no ip mroute-cache
 service-policy output QOS
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Question by:agradmin
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naderz earned 500 total points
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Please see below:

1) MPPP & QoS

Yes, you need PPP on all the serial interfaces and only apply QoS to the multilink interface. See example configs below:

interface Multilink1
 description 2xT1 bundle
 bandwidth 1544
 ip address 10.10.10.245 255.255.255.252
 no ip redirects
 no ip unreachables
 ip flow ingress
 no ip mroute-cache
 service-policy output QOS
 ppp multilink
 ppp multilink links minimum 1
 ppp multilink group 1
 ppp multilink fragment disable
!
interface Serial0/0/0
 description T1 to Remote site
 ! bandwidth 1544 (! this won't be necessary anymore)
 no ip address
 ppp multilink
 ppp multilink group 1
!
interface Serial0/1/0
 description T1 to Remote site
 ! bandwidth 1544 (! this won't be necessary anymore)
 no ip address
 ppp multilink
 ppp multilink group 1
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Author Comment

by:agradmin
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Thanks Naderz,
Would you recommend setting the following considering we will be using 2 x ptp T1's between 2 Cisco routers?

- ppp multilink fragment disable
- ppp multilink links minimum 1

I guess I am not sure if there is a real advantage doing so or whether this is simply a good standard practice.
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Expert Comment

by:naderz
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I have been using "ppp multilink fragment disable" as a precautionary measure to help with performance. Generally the less fragmentation overall the better. Some fragmentation, however, cannot be avoided.

"ppp multilink links minimum 1" basically sets the preferred minimum number of links to one. To me this is more deterministic.
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Author Closing Comment

by:agradmin
Comment Utility
Thanks for the speed assistance!
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