03-25-2012 09:15 PM - edited 03-07-2019 05:46 AM
According to this Cisco URL jumbo frames should be put into play by changing default ethernet system class.
Recommended configuration:
!--- You can enable the Jumbo MTU !--- for the whole switch by setting the MTU !--- to its maximum size (9216 bytes) in !--- the policy map for the default !--- Ethernet system class (class-default).switch(config)#policy-map type network-qos jumboswitch(config-pmap-nq)#class type network-qos class-defaultswitch(config-pmap-c-nq)#mtu 9216switch(config-pmap-c-nq)#exitswitch(config-pmap-nq)#exitswitch(config)#system qosswitch(config-sys-qos)#service-policy type network-qos jumbo
URL:
http://www.cisco.com/en/US/products/ps9670/products_configuration_example09186a0080b44116.shtml
My configuration:
policy-map type network-qos jumbo
class type network-qos class-default
mtu 9216
multicast-optimize
system qos
service-policy type network-qos jumbo
One of my 10Gig interfaces showing only a 1500 MTU
Ethernet1/3 is up
Hardware: 1000/10000 Ethernet, address: 547f.ee5c.69ca (bia 547f.ee5c.69ca)
Description: Netapp FilerA e3a
MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA
Port mode is access
full-duplex, 10 Gb/s, media type is 10G
03-26-2012 06:55 AM
Hi
Here is a link for video how to configure Jumbo frames:
https://supportforums.cisco.com/videos/1215
Also check "sh queuing interface eth 1/3"
there you will be able to see real mtu, since in some nx-os releases has a cosmetic issue in displaying correct mtu.
HTH,
Alex
03-26-2012 07:59 AM
Something else to look for:
sh interface ether1/3
Ethernet1/3 is down (SFP not inserted)
Hardware: 1000/10000 Ethernet, address: 000d.ecec.c9ca (bia 000d.ecec.c9ca)
Description: ovhesx01_clstr01
MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation ARPA
Port mode is trunk
auto-duplex, 10 Gb/s
Beacon is turned off
Input flow-control is off, output flow-control is off
Switchport monitor is off
Last link flapped never
Last clearing of "show interface" counters never
1 minute input rate 0 bits/sec, 0 packets/sec
1 minute output rate 0 bits/sec, 0 packets/sec
Rx
0 input packets 0 unicast packets 0 multicast packets
0 broadcast packets 0 jumbo packets 0 storm suppression packets
0 bytes
Tx
0 output packets 0 multicast packets
0 broadcast packets 0 jumbo packets
0 bytes
0 input error 0 short frame 0 watchdog
0 no buffer 0 runt 0 CRC 0 ecc
0 overrun 0 underrun 0 ignored 0 bad etype drop
0 bad proto drop 0 if down drop 0 input with dribble
0 input discard
0 output error 0 collision 0 deferred
0 late collision 0 lost carrier 0 no carrier
0 babble
0 Rx pause 0 Tx pause
0 interface resets
look for the jumbo frame counter.
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