Auto-QoS Broke my Port-Channel - Help needed :)

[TheDukeofBaghdad]

Hi Friends,

I will keep it short and to the point:

I am not a QoS expert so I used Auto-QoS on my network and that break my Port-Channels.

I am using Cisco 4507 with Cisco 3010.

Cisco 4507:

CISCO4507#show run inter gi2/7
Building configuration...

Current configuration : 286 bytes
!
interface GigabitEthernet2/7
description Layer 2 Trunk (All Allowed VLANs) To SWITCH12
switchport trunk allowed vlan 1,100
switchport mode trunk
switchport priority extend trust
qos trust extend
channel-protocol lacp
channel-group 12 mode active
end

CISCO4507#show run inter gi2/8
Building configuration...

Current configuration : 286 bytes
!
interface GigabitEthernet2/8
description Layer 2 Trunk (All Allowed VLANs) To SWITCH12
switchport trunk allowed vlan 1,100
switchport mode trunk
switchport priority extend trust
qos trust extend
channel-protocol lacp
channel-group 12 mode active
end

CISCO4507#show run inter port12
Building configuration...

Current configuration : 186 bytes
!
interface Port-channel12
description Layer 2 Port-Channel (Gi2/7-8) To SWITCH12
switchport
switchport trunk allowed vlan 1,100
switchport mode trunk
end

Cisco 3010:

CISCO3010#show run inter gi0/1
Building configuration...

Current configuration : 330 bytes
!
interface GigabitEthernet0/1
description Layer 2 Trunk (All Allowed VLANs) To SWITCH10
switchport trunk allowed vlan 1,100
switchport mode trunk
media-type sfp
srr-queue bandwidth share 10 10 60 20
priority-queue out
mls qos trust cos
channel-protocol lacp
channel-group 12 mode passive
end

CISCO3010#show run inter gi0/2
Building configuration...

Current configuration : 330 bytes
!
interface GigabitEthernet0/2
description Layer 2 Trunk (All Allowed VLANs) To SWITCH10
switchport trunk allowed vlan 1,100
switchport mode trunk
media-type sfp
srr-queue bandwidth share 10 10 60 20
priority-queue out
mls qos trust cos
channel-protocol lacp
channel-group 12 mode passive
end

CISCO3010#show run inter port12
Building configuration...

Current configuration : 174 bytes
!
interface Port-channel12
description Layer 2 Port-Channel (Gi0/1-2) To SWITCH10
switchport trunk allowed vlan 1,100
switchport mode trunk
end

The Port-Channel was up and working and it broke after I added the qos commands.

Any help my friends?

Thanks,

[Rich Uline]

The Duke,

Could you post the output of the following command for each switch?

show etherchannel summary

[TheDukeofBaghdad]

Thanks Rich Uline for your response, here is the output:

CISCO4507#show etherchannel summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator

M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port

Number of channel-groups in use: 3
Number of aggregators: 3

Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
12 Po12(SD) LACP Gi2/7(u) Gi2/8(u)
14 Po14(SD) LACP Gi2/9(u) Gi2/10(u)
16 Po16(SD) LACP Gi2/11(u) Gi2/12(u)

CISCO3010#show etherchannel summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator

M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port

Number of channel-groups in use: 1
Number of aggregators: 1

Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
12 Po12(SD) LACP Gi0/1(I) Gi0/2(I)

[TheDukeofBaghdad]

So based on the output it seems like the Cisco 4507 side is the one with the issue.

To verify that I removed the qos command:
-switchport priority extend trust
-qos trust extend

and sure enough the Port-Channels links comes up:

CISCO4507#show etherchannel summary
Flags: D - down P - bundled in port-channel
I - stand-alone s - suspended
H - Hot-standby (LACP only)
R - Layer3 S - Layer2
U - in use f - failed to allocate aggregator

M - not in use, minimum links not met
u - unsuitable for bundling
w - waiting to be aggregated
d - default port

Number of channel-groups in use: 3
Number of aggregators: 3

Group Port-channel Protocol Ports
------+-------------+-----------+-----------------------------------------------
12 Po12(SU) LACP Gi2/7(P) Gi2/8(P)
14 Po14(SU) LACP Gi2/9(P) Gi2/10(P)
16 Po16(SU) LACP Gi2/11(P) Gi2/12(P)

CISCO4507#show qos interface Gi2/7
Operational Port Trust State: Trusted
Trust device: none
Default DSCP: 0 Default CoS: 0

But does that mean the switch will discard any QoS marking (DSCP 46 for Voice traffic) on the packets ?
Any other suggested solution so I can keep higher priority for the Voice VLAN? for both the Cisco 4507 and Cisco 3010?

[Rich Uline · Accepted solution]

The Duke,

From the Cisco Medianet Design Guides here and here, it seems AutoQoS is not supported on EtherChannel interfaces. Those guides do, however, have instructions on how to manually implement a QoS configuration for those interfaces which is compatible with otherwise configured AutoQoS.