From: Douglas M Todd, Jr (dtodd@PARTNERS.ORG)
Date: Thu Jun 28 2007 - 12:01:58 ART
max-reserve-bandwidth allows you to use all 100% of the bandwidth for
user traffic, removing the 25% restriction. This allows you to use a
different percentage for control traffic if you want.
Thoughts:
1) If you are using a routing protocol then I would reserver X%. This
depends on what you are sending and receiving for advertisements. We
have a medium routing table here in production and we can get a way with
5% with the max-reserve bandwidth in place. You also need to keep in
mind the framing of the technology you are sending the traffic on. I
believe the framing is also part of the control percentage.
2) 75% is available for user traffic. If you look at the policy/shaping
you will see that the available bandwidth is -25%.
3) If you have static routes and no other control traffic (which I
believe also includes framing on some technologies ie., frame-relay)
then you can use all 100%. However, each environment is different, so
you will need to do some testing on your own.
DMT
Gregory Gombas wrote:
> I'm still not clear on what role max-reserved-bandwidth plays in
> protecting the routing protocol traffic.
>
> Isn't 25% of interface bandwidth reserved for control plane traffic by
> default?
>
> If so do you really need a separate class to reserve bandwidth for
> routing traffic?
> Or is that only necessary if you set max-reserved-bandwidth to 100%?
>
> Thanks again for your replies.
>
>
> On 6/25/07, Kamal Dissanayaka <kamalasiri@gmail.com> wrote:
>> Hi Greg,
>>
>> My understanding is pak_priority applies for locally sourced packets with
>> cs6, please correct me if I am wrong. As an example most of the IGP
>> traffic
>> is locally generated and span only one hop. On the other hand BGP
>> traverse
>> through network and you need to specially assign them to a queue.
>>
>> Please have a look on bellow link.
>>
>> http://www.cisco.com/en/US/products/sw/iosswrel/ps1829/products_feature_guide09186a008022564f.html
>>
>>
>> Best Regards
>> Kamal
>>
>>
>> On 6/26/07, Gregory Gombas <ggombas@gmail.com> wrote:
>> >
>> > I was wondering if you need to specify a seperate class-map for
>> > routing protocols.
>> >
>> > According to the following doc:
>> >
>> http://www.cisco.com/en/US/tech/tk543/tk544/technologies_tech_note09186a0080094612.shtml
>>
>> >
>> > On some platforms you need to specifically assign to a queue:
>> > "In other words, on the Cisco 7500 series, if an output service-policy
>> > is attached to the interface, then the packets are classified with
>> > respect to the classes in that policy, and the pak_priority packet is
>> > placed at the end of the chosen class queue. If the pak_priority
>> > packet does not match any user defined class, then it is placed at the
>> > tail of the class-default queue.".
>> >
>> > What is the rule of thumb regarding routing protocol QOS?
>> >
>> >
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