FEX 6800-IA interface high drop rate and high overrun counters combined with slow throughput.

[hsticher]

The interface drop rate count arises and the traffic throughput gets down to 15% of the nominal data rate of the 1Gb interface  when a server with a 10Gb interface send data to a client connected at 1Gb FEX interface.

How must I configure  the interface to achieve nearly 100% of 1Gb?

Client to Server: 100% of 1Gb;     Sever to Client 15% of 1Gb

Server ---(10Gb)--- Nexus7010-- (10Gb)--- C6880-X----(10Gb)---FEX----(1Gb)Client

[Joseph W. Doherty]

6880-X <> FEX ?

Did you mean

6880-X <> IA?

[hsticher]

Sorry, yes of course:

Server ---(10Gb)--- Nexus7010-- (10Gb)--- C6880-X----(10Gb)---6800-IA----(1Gb)---Client

[hsticher]

Hi,

TAC Observation:-

The temporary workaround is to create any lan-queuing policy-map, apply it on the FEX interface and then remove it.

class-map type lan-queuing match-all cs1

match dscp cs1

class-map type lan-queuing match-all cs2

match dscp cs2

policy-map type lan-queuing policy1

class type lan-queuing cs1

priority

class type lan-queuing cs2

    bandwidth remaining percent 10

And apply this policy on host port on FEX and remove it,

Router(config)#int gigabitEthernet 103/1/0/19

Router(config-if)#service-policy type lan-queuing output policy1

Propagating [attach] lan queueing policy "policy1" to Gi103/1/0/1 Gi103/1/0/2 Gi103/1/0/3 Gi103/1/0/4 Gi103/1/0/5 Gi103/1/0/6 Gi103/1/0/7 Gi103/1/0/8 Gi103/1/0/9 Gi103/1/0/10 Gi103/1/0/11 Gi103/1/0/12 Gi103/1/0/13 Gi103/1/0/14 Gi103/1/0/15 Gi103/1/0/16 Gi103/1/0/17 Gi103/1/0/18 Gi103/1/0/20 Gi103/1/0/21 Gi103/1/0/22 Gi103/1/0/23 Gi103/1/0/24 Gi103/1/0/25 Gi103/1/0/26 Gi103/1/0/27 Gi103/1/0/28 Gi103/1/0/29 Gi103/1/0/30 Gi103/1/0/31 Gi103/1/0/32 Gi103/1/0/33 Gi103/1/0/34 Gi103/1/0/35 Gi103/1/0/36 Gi103/1/0/37 Gi103/1/0/38 Gi103/1/0/39 Gi103/1/0/40 Gi103/1/0/41 Gi103/1/0/42 Gi103/1/0/43 Gi103/1/0/44 Gi103/1/0/45 Gi103/1/0/46 Gi103/1/0/47 Gi103/1/0/48

Router(config-if)#

Router(config-if)#no service-policy type lan-queuing output policy1

Propagating [remove] lan queueing policy "policy1" to Gi103/1/0/1 Gi103/1/0/2 Gi103/1/0/3 Gi103/1/0/4 Gi103/1/0/5 Gi103/1/0/6 Gi103/1/0/7 Gi103/1/0/8 Gi103/1/0/9 Gi103/1/0/10 Gi103/1/0/11 Gi103/1/0/12 Gi103/1/0/13 Gi103/1/0/14 Gi103/1/0/15 Gi103/1/0/16 Gi103/1/0/17 Gi103/1/0/18 Gi103/1/0/20 Gi103/1/0/21 Gi103/1/0/22 Gi103/1/0/23 Gi103/1/0/24 Gi103/1/0/25 Gi103/1/0/26 Gi103/1/0/27 Gi103/1/0/28 Gi103/1/0/29 Gi103/1/0/30 Gi103/1/0/31 Gi103/1/0/32 Gi103/1/0/33 Gi103/1/0/34 Gi103/1/0/35 Gi103/1/0/36 Gi103/1/0/37 Gi103/1/0/38 Gi103/1/0/39 Gi103/1/0/40 Gi103/1/0/41 Gi103/1/0/42 Gi103/1/0/43 Gi103/1/0/44 Gi103/1/0/45 Gi103/1/0/46 Gi103/1/0/47 Gi103/1/0/48

Router(config-if)#

Then you will see the changes in the priority queue.

Router(config-if)# do remote command fex 103 show mls qos interface gig 1/0/19 queueing

GigabitEthernet1/0/19

Egress Priority Queue : enabled

Shaped queue weights (absolute) :  0 0 0 0

Shared queue weights  :  0 84 84 84<<<<<<<<<<<

The port bandwidth limit : 100  (Operational Bandwidth:100.0)

The port is mapped to qset : 1

Now please try to send file from server to client. And let me know if you see any drops.

This issue is due to the defect # CSCuu30115  / CSCuu52415 , and the fix for this defect is available in 15.2(1)SY2

Resolution :-

Workaround has been provided and we need to wait for final release of SY2 which is expected to be available on CC October’15 tentatively. I have added your CCO id on bugtoolkit.

Whenever any update related to this bug you will be notified via email. It was nice working with you and thanks for choosing Cisco. If you want to share any feedback related to handling of this Service Request to our management team, please do not hesitate in contacting  my Manager - Mahesh Dawar. Email :mdawar@cisco.com