QoS L2L (layer 3) Cat 6500 & 6800

[Heriberto Diaz]

Hi

I have an L2L between 2 switches (Cat 6500 with SUP-720 and Cat 6800 with Sup-2T-10G) through an L3 interface, we have already found too many total ouput drop on both sides, checking the interfaces that have the TX / RX They are not saturated.

One of the actions taken is to enable QoS on both ends, the packages are marked from the application with their respective DSCP (EF, AFXX)

Cat6500(config)#mls qos 
!
interface GigabitEthernetX/Y/Z
no switchport
ip address 172.X.X.X 255.255.255.252
mls qos trust dscp 

Cat6800(Config)#mls qos

interface GigabitEthernetX/Y/Z 
no switchport ip address 172.X.X.X 255.255.255.252 
How I configure QoS DSCP on the interface?

I have the doubt if the configuration is correct, specially in the Cat6800 because I didn't find documentation about how to apply QoS on SUP-2T-10G.

Does anyone know If I missed something?

Thanks and regards.

[Giuseppe Larosa]

Hello Heriberto,

 I have found links for QoS configuration guides for Sup 2T on catalyst 6500

see

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/15-4SY/config_guide/sup2T/15_4_sy_swcg_2T/qos_global_and_if.html#64508

This may be what are looking for DSCP based queueing.

I also provide the link to all the configuration guides so that you can look at all the docs abour QoS

https://www.cisco.com/c/en/us/td/docs/switches/lan/catalyst6500/ios/15-4SY/config_guide/sup2T/15_4_sy_swcg_2T.html

And finally this is the launch page for C6800 config guide

https://www.cisco.com/c/en/us/support/switches/catalyst-6800-series-switches/products-installation-and-configuration-guides-list.html

The pages look like to be shared by the two platforms

Hope to help

Giuseppe