08-05-2010 11:48 AM - edited 03-04-2019 09:19 AM
HI - I was wondering if there are any advantages or disadvantages to hardcoding the bandwidth statement on a MLPP interface versus letting it be set dynamically by the router.
Thanks, Karen
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08-05-2010 01:17 PM
One thing that comes to mind is service policies. If there is a service policy attached to the MLPPP interface, then the policy evaluates the interface bandwidth value when it allocates bandwidth per class based on a percentage.
Let's say there were three T1's in a bundle and a particular class was allocated 20%. This would be about 900Kbps normally. If one T1 drops out due to a circuit outage than the interface bandwidth value would automatically change to 3Mbps; in turn automatically shrinking the bandwidth available for the class to 600Kbps.
Manually setting the bandwidth attribute on the MLPPP interface would prevent this automagic from occurring.
Chris
08-05-2010 01:17 PM
One thing that comes to mind is service policies. If there is a service policy attached to the MLPPP interface, then the policy evaluates the interface bandwidth value when it allocates bandwidth per class based on a percentage.
Let's say there were three T1's in a bundle and a particular class was allocated 20%. This would be about 900Kbps normally. If one T1 drops out due to a circuit outage than the interface bandwidth value would automatically change to 3Mbps; in turn automatically shrinking the bandwidth available for the class to 600Kbps.
Manually setting the bandwidth attribute on the MLPPP interface would prevent this automagic from occurring.
Chris
08-16-2010 08:15 AM
Thanks for the response - that makes sense. I have another question that perhaps you can answer - I have a six T1 MLPPP bundle in a 3845, T1s on S0/0/0 - S0/3/0 and S1/0/0-S1/1/0. I'm having circuit issues on S0/0/0 and it took down the entire MLPPP. I admin downed the interface and the MLPPP came back up. I then had issues on S1/0/0 and again, it took down the entire bundle. I have minimum links configured to 1 on the MLPPP interface. I'm confused on why when one T1 goes down, it takes the entire bundle down?? Any suggestions?
Thanks, Karen
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