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Beginner

bandwidth management by available percentage in 6807 Cisco Core

I am working with a 6807 and would like to create a policy that would manage bandwidth via subnet/vlan. I'll post an example I found elsewhere below that would handle a similar scenario in that it divides bandwidth 3ways 33% for each defined subnet and only takes effect if the data-rate is matched and exceeded otherwise it is a free for all on the allotted bandwidth. Unfortunately, the syntax is not directly compatible with our core, not sure, what this example was applied to. Particularly when I get to: "service-policy subnets" I am uncertain as to how to specify this. Perhaps this is more of a QOS configuration that needs to be approached though my experience there is severely limited.

 

sample code of concept follows:

 

access-list 101 permit ip any a.a.a.a w.w.w.w Subnet A

access-list 102 permit ip any b.b.b.b w.w.w.w Subnet B

access-list 103 permit ip any c.c.c.c w.w.w.w Subnet C

 

class-map subnet-a

match access-group 101

 

class-map subnet-b

match access-group 102

 

class-map subnet-c

match access-group 103

 

policy-map subnets

class-map subnet-a

 bandwidth percent 33

 

 class-map subnet-b

 bandwidth percent 33

class-map subnet-c

bandwidth percent 33

 exit

 policy-map physical

class class-default

police 30000000 conform-action transmit exceed-action drop

service-policy subnets

 exit

 

int fa0/1 service-policy output physical

 exit

2 REPLIES 2
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VIP Expert

Your QoS policy probably comes from a Cisco router. The Catalyst 6x00 series, QoS, is very much determined by line cards. It's also generally, much feature less than what's found on a Cisco router.

If you really, really (really) feel the need to provide a 1/3 bandwidth guaranteed to one of 3 subnets, that could be done by directing each VLAN/subnet to its own (hardware) queue given a 1/3 share ratio. (Most Catalyst line cards support 4 queues, later line cards usually support 8 queues.) (It's unclear, to me, how you want to manage bandwidth consumption above and below the 1/3).

Highlighted

I believe that @Joseph W. Doherty has pointed us in the right direction. I found this link which I hope might be helpful about QOS on Catalyst switches

https://www.cisco.com/c/en/us/products/collateral/switches/catalyst-6500-series-switches/white_paper_c11-652042.html

 

HTH

 

Rick

HTH

Rick
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