Hello,
We moved the NAS devices to the N5K switches, but now we are watching a lot of jumbo packets.
These NAS device is connected to our switches through 2 ports, one of each switch, grouped in a port-channel with VPC:
(example from one switch)
bltpro7
interface Ethernet1/25
description MONIT_NO VPC60 NAB250 HNAS
switchport mode trunk
spanning-tree port type edge trunk
no snmp trap link-status
channel-group 60 mode active
interface port-channel60
description MONIT_NO VPC60 NAB250 HNAS
switchport mode trunk
spanning-tree port type edge trunk
speed 10000
no snmp trap link-status
vpc 60
If we check the interface details, we can see that the MTU is configured at 1500, but we are sending/receiving Jumbo packets
bltpro7# show interface Po60
port-channel60 is up
vPC Status: Up, vPC number: 60
Hardware: Port-Channel, address: 00de.fb8d.9a00 (bia 00de.fb8d.9a00)
Description: MONIT_NO VPC60 NAB250 HNAS
MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA, medium is broadcast
Port mode is trunk
full-duplex, 10 Gb/s
Input flow-control is off, output flow-control is off
Switchport monitor is off
EtherType is 0x8100
Members in this channel: Eth1/25
Last clearing of "show interface" counters 3d11h
0 interface resets
30 seconds input rate 46185608 bits/sec, 7034 packets/sec
30 seconds output rate 53419344 bits/sec, 20476 packets/sec
Load-Interval #2: 5 minute (300 seconds)
input rate 43.24 Mbps, 6.83 Kpps; output rate 56.23 Mbps, 22.36 Kpps
RX
1872937387 unicast packets 9972 multicast packets 124 broadcast packets
1872947483 input packets 2493451346584 bytes
1602398068 jumbo packets 0 storm suppression bytes
0 runts 0 giants 0 CRC 0 no buffer
0 input error 0 short frame 0 overrun 0 underrun 0 ignored
0 watchdog 0 bad etype drop 0 bad proto drop 0 if down drop
0 input with dribble 39853 input discard
0 Rx pause
TX
2685167916 unicast packets 15900800 multicast packets 228766254 broadcast packets
2929835221 output packets 571449328718 bytes
217270636 jumbo packets
0 output error 0 collision 0 deferred 0 late collision
0 lost carrier 0 no carrier 0 babble 0 output discard
0 Tx pause
This Jumbo packets are incremental:
bltpro7# show interface Po60 | i jumbo
1605236730 jumbo packets 0 storm suppression bytes
219580151 jumbo packets
At policy level, we have these configuration applied:
policy-map type network-qos jumbo
class type network-qos class-fcoe
pause no-drop
mtu 2158
class type network-qos class-default
mtu 9100
system qos
service-policy type network-qos jumbo
service-policy type queuing input fcoe-default-in-policy
service-policy type queuing output fcoe-default-out-policy
service-policy type qos input fcoe-default-in-policy
Which MTU is applied to the interface? the class-default policy? or the 1500 of the interface?
Please help me with to clear jumbo frames.
Regards,
Moula Ali
