Hi,
We are having a CAT 4006 (IOS ver.) Switch with two VALN's(Data and Voice) and we are getting packet loss without QoS configured and no packet loss with QoS configured.
If you look into interface you won't see anything out of the ordinary, but if you
try : Cat> sh int fast2/23 summ
you will see the Packet Drops from Output Queue OQD=26900 and we kind of wondering what is causing these.
We went to do some search on Cisco.com and at this point we couldn't get an answer to this issue.
I am wondering if someone has this issue and what was the fix?
Cat 4006 has SUP 2+ , no spanning tree and IOS:
cat4000-i9k91s-mz.122-25.EWA5.bin
cat>qos dbl exceed-action ecn
qos dbl
qos map dscp 0 to tx-queue 2
qos map cos 5 to dscp 46
qos
............
class-map match-all VOICE-VLAN
match access-group name VOICE-VLAN
!
!
policy-map BUFF
class class-default
dbl
policy-map IPPHONE
class VOICE-VLAN
set dscp ef
class class-default
set dscp default
........
!
interface GigabitEthernet1/1
description Uplink to Core_SW 4/9
switchport access vlan 100
switchport trunk encapsulation dot1q
switchport trunk allowed vlan 1,100,200,210 switchport mode trunk service-policy output BUFF qos trust dscp tx-queue 1
bandwidth percent 5
tx-queue 2
bandwidth percent 25
tx-queue 3
bandwidth percent 30
priority high
shape percent 30
tx-queue 4
bandwidth percent 40
no cdp enable
..................
interface FastEthernet2/23
description 2C119-2 004
switchport access vlan 100
switchport voice vlan 210
service-policy output BUFF
qos trust dscp
tx-queue 3
priority high
shape percent 30
no cdp enable
..............
ip access-list extended VOICE-VLAN
permit ip X.Y.Z.V any dscp ef
....................
CAT>sh int fa2/23 sum
*: interface is up
IHQ: pkts in input hold queue IQD: pkts dropped from input queue
OHQ: pkts in output hold queue OQD: pkts dropped from output queue
RXBS: rx rate (bits/sec) RXPS: rx rate (pkts/sec)
TXBS: tx rate (bits/sec) TXPS: tx rate (pkts/sec)
TRTL: throttle count
Interface IHQ IQD OHQ OQD RXBS RXPS TXBS TXPS TRTL
------------------------------------------------------------------------
* FastEthernet3/10 0 0 0 26900 0 0 61000 67 0
NOTE:No separate counters are maintained for subinterfaces
Hence Details of subinterface are not shown
CAT>sh int fa3/23 count
Port InBytes InUcastPkts InMcastPkts InBcastPkts
Fa3/10 79664016 352391 863 4760
Port OutBytes OutUcastPkts OutMcastPkts OutBcastPkts
Fa3/10 1165018481 472486 487050 8605889
C46-1-2A213>sh int fa2/23 count err
Port CrcAlign-Err Dropped-Bad-Pkts Collisions Symbol-Err
Fa3/10 0 0 0 0
Port Undersize Oversize Fragments Jabbers
Fa3/10 0 0 0 0
Port Single-Col Multi-Col Late-Col Excess-Col
Fa3/10 0 0 0 0
Port Deferred-Col False-Car Carri-Sen Sequence-Err
Fa3/10 0 0 0 0
