Legacy Custom Queue & MQC

Custom and MQC

Thought I’d share with you some relatively simple scenario and different ways of approach.

Users on R4 complaining about slow when browsing your internal web server at
Configure R3 so that web traffic from the server is guaranteed 1Mbps out its Serial Interface during congestion.
Let’s assume that R3 interface is T1 and it has bandwidth of 1.536Mbps

Two different approaches we can take to resolve this question:

1- Legacy Custom Queue

What we need to match:
R3(config)#access-list 100 permit tcp host eq 80 any

R3(config)#queue-list 1 protocol ip 1 list 100   – web traffic
R3(config)#queue-list 1 default 2                        – everything else

What we need to reserve:
R3(config)#queue-list 1 queue 1 byte-count 1500       – default byte count is 1500

So in order to guarantee 1Mbps for web traffic knowing that T1 bandwidth is 1.536Mbps we do :
R3(config)#queue-list 1 queue 1 byte-count 1000      – web traffic
R3(config)#queue-list 1 queue 2 byte-count 536        – everything else

R3(config-if)#custom-queue-list 1

Does not give any option for direction because queuing is only outbound



2- MQC

What we need to match:
R3(config)#access-list 100 permit tcp host eq 80 any
R3(config)#class-map WEB_SERVER
R3(config-cmap)#match access-group 100

What we need to reserve:
R3(config)#policy-map WEB
R3(config-pmap)#class WEB_SERVER
R3(config-pmap-c)#bandwidth 1000

By default on the interface we can reserve 75% of the bandwidth. This is so you don’t accidently starve other important traffic like routing protocols or layer 2 keepalives , you can change it with the command:

R3(config-if)#max-reserved-bandwidth ?
<1-100>  Max. reservable bandwidth as % of interface bandwidth

R3(config-if)#service-policy output WEB



In my opinion MQC is way much clearer to understand and implement.

Enjoy !



About ccie4all
Hello, and welcome to the first post of my CCIE blog This blog has got one simple goal and that is to improve our skills in Cisco Networking field so we can become best engineers on a job market. Wordpress Blog https://ccie4all.wordpress.com/ information about the changes made to Gns3 BGP , MPLS and R&S CCIE labs. In order to access and download all provided materials and receive important updates from Gns3 BGP , MPLS and R&S CCIE labs under GNS3 tab in the main header please go ahead and subscribe to https://ccie4all.wordpress.com/ ! All other posts have not been affected and can be accessed at any given time. Enjoy ! Tom

2 Responses to Legacy Custom Queue & MQC

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    • ccie4all says:

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