High Output Drop on Uplink of ME-3400EG-2CS-A

[yllee1314]

Hi,

Would like some advises on the maximum service that could be provisioned via an ME-3400EG-2CS-A?

As I have tried to provision a 1Gb P2P service  but the output drop on the uplink towards PE will increses when the link was tested.

[Amit Goyal]

Hi,

Ethernet ports of ME3400 by default have output queue limited to 48 packets. It may not be able to handle bursty traffic. You may obsrved output queue drops if the traffic is aproaching to 1 Gbps.

You can try adjusting the queue-limit as per below. Please note that max queue limit for ME-3400 is 544.

policy-map max-queue
 class class-default
 queue-limit 544

Attch the Policy-map in outbound direction.

QoS on ME3400 works, you can use hierarchical policy-map with traffic-shape at parent level and strict priority for VoIP data at
child level.

HTH

-Amit

[yllee1314]

Hi Amit,

I 've tried configuring the queue limit on the uplink, however, traffic still continues to drop during the testing.

!

interface GigabitEthernet0/3
port-type nni
switchport trunk native vlan 999
switchport trunk allowed vlan 999,1202
switchport mode trunk
ethernet cfm mip level 4
ethernet oam max-rate 5
ethernet oam remote-loopback supported
ethernet oam timeout 30
ethernet oam
hold-queue 4096 out

!

GigabitEthernet0/3 is up, line protocol is up (connected)
MTU 9000 bytes, BW 1000000 Kbit, DLY 10 usec,
reliability 255/255, txload 13/255, rxload 13/255
Encapsulation ARPA, loopback not set
Keepalive not set
Full-duplex, 1000Mb/s, link type is auto, media type is 1000BaseLX SFP
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:00, output 00:00:00, output hang never
Last clearing of "show interface" counters never
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 1757767
Queueing strategy: fifo
Output queue: 0/0 (size/max)
5 minute input rate 52039000 bits/sec, 5883 packets/sec
5 minute output rate 52038000 bits/sec, 5882 packets/sec
3962840583 packets input, 986554600686 bytes, 0 no buffer
Received 157042 broadcasts (116619 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 116619 multicast, 0 pause input
0 input packets with dribble condition detected
3962752726 packets output, 986544278570 bytes, 0 underruns
0 output errors, 0 collisions, 1 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 PAUSE output
0 output buffer failures, 0 output buffers swapped out

[Amit Goyal]

Hi,

Please try to use below method to change the queue limit.

policy-map max-queue
 class class-default
 queue-limit 544

If it doesn't help, you might need to fix the source of bursty traffic because ME-3400 can not hold queue more then this or you might need to think for an hardware upgrade.

Please rate if it helped.

HTH

-Amit