03-28-2008 12:43 PM - edited 03-05-2019 10:03 PM
I've been playing with nested cbQos several times on pure L3 devices.
My usual configuration use:
- parent policy, with general policer limiting bandwith per-vlan
- child policy, with percentage on NBAR matching
Now I wanted to use the same approach on my switched network:
- cat2960 as access-devices
- cat6500 sup720 as distribution/core ones
I've been setting a police/class on vlan, and specifying "mls qos per-vlan" on trunk port between access and core.
Although I see some improvement (flow is slowed), the expected police is not reached (e.g. set a "police 32000" and I get a 1Mbit of traffic, sustained)
Any suggestion, before leaving CBQOS and try to use Cos/DSCP?
TIA
Ivan
04-03-2008 09:51 AM
go through this Catalyst 6500 Series Software Configuration Guide (Configuring QoS) . It will clear your doubts.
http://www.cisco.com/en/US/docs/switches/lan/catalyst6500/catos/8.x/configuration/guide/qos.html
04-03-2008 10:27 AM
A good reading.
Will keep this as a reference.
Unfortunately, my 6500s are running Native-IOS, so I have to dig into the IOS equivalent commands.
Thank you
04-08-2008 03:23 AM
The CatOS version of the documentation seems a bit more clear than the Native one:
BTW, I managed to configure the policer in a CBQOS way, applying on VLAN:
1) (optional) mark packets at access switch, and set the trust mode on trunk poort
2) set an IP access-list on core.
I would put on a core, since I have several access switches on policed VLAN, and I want to make an aggregated L3 police.
3) set a class-map on core, matching ACL
4) set a policy map on core, matching class-map
5) apply policy map w/ the service-policy command.
PLEASE NOTE:
- use "output" clause for inbound traffic directed to VLAN
- use "input" clause for outbound traffic coming from VLAN
this makes perfect sense if you think of VLAN just like a physical interface.
6) (optional) set qos vlan on trunk port coming from access-switches:
MLS01(config-if)# mls qos vlan-based
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